GB/T 50500-2024, China's BOQ pricing standard: positioning, 2024-vs-2013 changes, chapter map and card-group navigation
GB/T 50500-2024, the China national pricing standard for BOQ-based pricing (MOHURD Announcement No. 212 of 2024, approved 26 November 2024), came into force on 1 September 2025 and repealed GB 50500-2013. Its status shifted from a partly mandatory code to a recommended national standard (GB to GB/T), aiming to regularise pricing rules and let the market form construction costs. It governs pricing activity in tendering, contracting and execution for construction works; EPC and other general-contracting models apply it by reference, and the requirement that state-funded projects use BOQ pricing is carried by a MOHURD ministerial order. Nine headline revisions (per the foreword): risk scope and allocation rules by contract form; a new bid clarification mechanism; revised pricing of preliminaries; the 'contract price agreement' chapter replaced by contract selection and requirements; revised measurement and adjustment rules; site visas abolished and additional-works pricing introduced; interim settlement by construction stage added; dispute resolution revised; the cost-expert-assessment chapter deleted. The structure was rebuilt from 16 chapters into 12 chapters plus annexes: 'tender control price' renamed tender price ceiling; completion settlement and contract-termination settlement merged into 'works settlement and payment' (absorbing stage settlement); dispute resolution and expert assessment merged; pricing tables moved to annexes (with a new Annex G, schedule of price-adjustable key materials).
Applicable Codes
- GB/T 50500-2024 建设工程工程量清单计价标准（住建部公告 2024 年第 212 号；第1.0.1～1.0.3条、Ch. 8、App. A～G、前言）
- GB 50500-2013 建设工程工程量清单计价规范（已废止，对照）
- GB/T 50854-2024～GB/T 50862-2024 各专业工程量计算标准（配套计量体系）
- 住建部令第16号（国有资金项目工程量清单计价要求的承接依据）
GB/T 50500-2024, the current national standard for pricing on a bill of quantities (BOQ) basis in China, was issued on 26 November 2024 and took effect on 1 September 2025, replacing GB 50500-2013. Practitioners most often look up five things here: the standard's legal status and scope, the core changes against 2013 (site visas abolished, stage settlement added, expert assessment chapter deleted), what each of the twelve chapters covers, how it interfaces with the nine measurement standards (GB/T 50854~50862-2024), and the detailed rules at each pricing stage. This card maps the positioning, the 2024-vs-2013 changes and the chapter structure, and navigates 83 related cards on this site by sub-topic.
Concept and mechanism
Positioning and scope. Purpose (1.0.1): to regularise pricing rules and methods, improve the market-based formation of construction costs, and support high-quality cost management, under the Civil Code, Construction Law, Bidding Law and Price Law. Scope (1.0.2): pricing activities in tendering, contracting and execution of construction works; other pricing activities may refer to it; EPC and similar delivery models apply it by reference where consistent. Principles (1.0.3): objective and fair, equal and voluntary, honest and trustworthy, law prevails / contract prevails ("statutory first, then as agreed") — the logic that runs through the whole standard. In status it moved from GB (with mandatory provisions) to GB/T (recommended), and from "code" (规范) to "standard" (标准); the mandatory BOQ-pricing requirement for state-funded projects is carried by MOHURD Order No. 16. The nine companion measurement standards (GB/T 50854~50862-2024) were revised in parallel, forming a two-pillar system of pricing standard plus measurement standards.
Core changes, 2024 vs 2013. (1) Status and title: GB to GB/T, code to standard; the 2013 mandatory provisions are gone. (2) Site visas abolished: the whole 2013 Cl. 9.14 regime (submit the visa report within 7 days, verify within 48 hours, silence means approval) is deleted; work outside the contract now flows through three channels — variation (8.9), additional works (8.10) and dayworks (measured under 7.5, priced under 8.6) — with procedural time limits now "as agreed in the contract". (3) New content: interim settlement by construction stage (10.2), measurement and pricing of additional works, and the bid clarification mechanism. (4) Restructure: tender control price renamed tender price ceiling; "general provisions" becomes "basic provisions"; the 2013 chapters "contract price agreement" and "measurement" merge into "measurement of the works", with new content on contract selection and requirements; "final account and payment" and "settlement and payment upon termination" merge into "works settlement and payment"; "resolution of price disputes" and "cost expert assessment" merge (assessment now follows the expert-assessment standards system); "pricing data and archives" and "pricing tables" become "pricing deliverables and archive management" plus annexed forms. (5) Mechanism revisions: risk scope and allocation by contract form, preliminaries pricing, and the composition of the all-in unit rate (treatment of statutory levies and taxes in BOQ pricing — see the comparison cards).
Chapter map. Twelve chapters: 1 General | 2 Terminology | 3 Basic provisions (principles and risk allocation) | 4 Preparation of the BOQ | 5 Preparation of the tender price ceiling | 6 Bid pricing | 7 Measurement of the works (incl. dayworks measurement, 7.5) | 8 Adjustment of the contract price (8.1 general — eleven triggering events; 8.2 BOQ errors; 8.3 provisional sums; 8.4 PC sums; 8.5 employer-supplied materials and contractor's services; 8.6 dayworks; 8.7 changes in costs; 8.8 changes in laws and policies; 8.9 variations; 8.10 additional works; 8.11 claims) | 9 Interim payments | 10 Works settlement and payment (10.2 stage settlement, 10.3 final account) | 11 Resolution of price disputes | 12 Pricing deliverables and archive management. Annexes: A methods of price adjustment for changes in costs (index-based formula adjustment; adjustment based on published price information) | B covers | C title pages | D pricing statements | E cost summary schedules | F payment application (certification) forms | G schedule of price-adjustable key materials.
Card-group navigation
This is the site's largest standard-topic card group — 83 active public cards, grouped by sub-topic:
Regulatory positioning and the 2013-vs-2024 comparison (11)
- GB to GB/T: status change and where the 2013 mandatory provisions went (card_7f497906-3bb5-48ce-829d-1fd8cf716e9e)
- Scope: BOQ pricing required for state-funded projects (card_5e5d4954-5507-41f3-907d-97cfb2ac2939)
- Edition comparison: all-in unit rate composition, levies and taxes (card_7c16e399-30d2-4c4f-bd47-33a7decef08d)
- Changes to statutory levies, taxes and the mandatory HSE provisions (card_a71babc6-4bfb-451a-b803-a0fbd116612f)
- Appendix A cost-adjustment methods: 2013 vs 2024 (card_61bfde56-cf86-4ee0-9f4a-42ccc74bf5cb)
- Tender price ceiling: old and new names, same instrument (card_5d678748-a98b-435b-b678-2c9995ec3b99)
- Liability for erroneous or missing BOQ items: 2013 vs 2024 (card_f4fd7d14-d9c6-4c5c-adf2-0cca66d5d3d3)
- 28-day claim notice: from 'right forfeited' to 'deemed' wording (card_09c641f2-bc78-4362-ba94-a2d40bc088bd)
- Deemed-approval 28 days at final account: 2013 vs 2024 (card_161893ea-e8ff-451d-ac10-77daa13479bc)
- Mandatory HSE provisions prepayment ratio: 2013 (60%) vs 2024 (card_e28fc14c-56d6-4754-a960-894491812a59)
- Ch.11 dispute resolution ladder vs the repealed 2013 code (card_5f27d131-7aa0-4550-b7ec-712d03d8503b)
Pricing modes and the all-in unit rate (3)
- Three pricing modes: unit-rate, lump-sum and fee-based (card_2672869f-a1c6-467e-ac27-69286f4fd08f)
- All-in unit rate: definition and cost composition (card_cae86f8f-2023-40e9-9359-c4a28654d209)
- Why the all-in unit rate excludes VAT (card_23142d8d-4ef9-4335-8229-2f817cafa6f9)
BOQ preparation and the measurement standards (5)
- BOQ overview: composition, preparation, error handling (card_f8d07049-c9f6-4edf-90d2-01f76c762a88)
- Interface with the nine measurement standards (GB/T 50854~50862) (card_5b12d7a2-7d70-47b6-a26b-a3eded2a6b32)
- Item descriptions vs method of measurement (card_8b42fdc0-046f-41fb-aabd-ee69d61d87d3)
- Risk allocation for incomplete item descriptions (card_e6714d1b-55e6-4316-a889-a1bf9dc90c72)
- BIM detailing causes extra pipework: adjustable or not (card_42c75bdb-2656-42c9-9025-9a426f46cf95)
Tender price ceiling and bid pricing (4)
- Tender price ceiling: framework and cost composition (card_fa1bb0b2-4711-4596-baff-2ca0a931a500)
- Bid clarification mechanism (Cl. 3.5) (card_3193f616-b367-46bd-ac24-39cffa9dfd5e)
- Four-layer screening of high-risk tender clauses (card_4396a5e1-0e32-4353-8fb1-e058389c637e)
- Ensuring completeness of preliminaries at tender stage (card_a3531785-8764-47a5-bd7b-9085befef109)
Risk allocation and preliminaries (6)
- Risk split for measurement and pricing (3.3.2/3.3.3) (card_7cabe69e-2511-43ee-ae6e-470f59dc6532)
- Quantity risk vs price risk: a distinguishing framework (card_9742fe23-3fc9-496c-97ae-d78503ac57e4)
- Statutory safety provisions: nature and pricing rules (non-competitive item) (card_ce7f7c58-b039-4a27-b10c-cb989105fb1b)
- Statutory safety provisions: prepayment and payment rules (card_ebc4e22c-6025-4b80-a9a6-afdc97c63cc5)
- Preliminaries: lump-sum no-adjust principle and exceptions (card_7165fbaa-b0b1-45d7-9c06-55043d035eaa)
- Prelinaries risk allocation: 2013 vs 2024 (card_7b8e0893-2c93-4669-8034-3971cb01d2b8)
Core price-adjustment mechanisms (7)
- After site visas were abolished: three alternative channels (card_5381fc22-64e2-4297-b46f-eb7209e93cba)
- Unit-rate adjustment at the ±15% quantity boundary (card_4f7ff59d-47fe-4a57-a7ea-84270d0f4f6e)
- Re-rating when a design change alters work methods (card_3e671cf3-ee96-4757-97ca-60668906dea5)
- Lump-sum contracts: four-layer bar on BOQ-error adjustments (card_c98a1dd7-3da4-4101-8aa2-bbbe5e06e26f)
- Determining the base date (card_8efe9278-1142-488e-b677-3266bff33168)
- Cost adjustment vs change of circumstances: priority order (card_2d1604a2-4085-4524-9990-76353363b137)
- Employer's 28-day reply duty to claims; deemed approval on silence (card_2ce4a194-4a0b-471b-9875-3aecb27ec4d9)
Provisional sums, PC sums and contractor's services (9)
- Provisional sums: ownership and use, 2013 vs 2024 (card_1be602eb-2255-43a3-bc2e-8b29888d5264)
- PC sums: VAT-inclusive vs VAT-exclusive treatment (card_30f1fd6d-ba3f-45cf-9a14-9870bc3fe3df)
- Adjustments after PC-sum prices are fixed (Cl. 8.4) (card_347f94f5-b308-4a87-a840-d45fac858160)
- Pricing rules for nominated specialist works (card_2b1eae36-0b1f-4c2d-a1c2-aaa0f071db0e)
- Material PC sums across bid, execution and final account (card_32eb1244-41c7-45d7-aff7-16f3fc40d1be)
- Provisional sums vs prime cost allowance at estimate stage (card_010f4b23-7a1c-4152-8c4b-66e9ac8ad6b4)
- Contractor's services: pricing and settlement adjustment (card_a679609f-cd4f-4bdb-8cd1-3b38e3d2188d)
- What counts toward contractor's services (card_f7f83e16-d377-48d3-a3fc-4508c25def79)
- Contractor's services: base and rate (C=A×B) (card_81a9749b-4544-4bf8-a616-297107e7bbae)
Adjustment for changes in costs (12)
- Material price adjustment overview (card_2b612223-0459-42dd-8544-1a2bee67c5e4)
- Order of precedence and the default 5% band (card_9aad098d-78fd-47f1-a41f-8145ccec2016)
- Computing the differential: published-price method (card_62aa394a-1312-44fe-99d7-c669b99e4866)
- Determining quantities subject to adjustment (card_babf7bf2-ea53-4c6b-9a75-1dcb9d06a782)
- Can actual purchase volumes be used directly? (card_a998f5a1-cb84-433c-8883-73390c6cba39)
- Published price information as adjustment basis: three preconditions (card_effa3afd-2ab0-40de-a7ee-42b2f33ff356)
- Ready-mixed concrete: price adjustment worked through (card_13851284-b3e5-4ddb-b7ea-3ec20e58223b)
- Cement: adjustment by end-use path (card_7698b766-8913-424b-9068-72b13daf8b5d)
- Cables and wiring: itemised adjustment with copper linkage (card_3d29bbc7-5a48-4d59-a51c-b6df5ff0d18f)
- Steel: adjustment formula by specification and period (card_4f3af050-9398-48f3-a01f-14ccfbedf603)
- Cross-month adjustment: period split, three averaging methods (card_b550bbda-666b-40d7-83ad-1600a1c184e1)
- Appendix G schedule of price-adjustable key materials (card_189c57dd-ec94-4ed8-9f36-bc9d6471ba45)
Payments: advance, progress and stage settlement (10)
- Advance payment ratio: old vs new (card_c5357961-9094-4acb-b19f-44bfc4cfe271)
- Computing progress payments (card_9fd927b3-4068-46c7-ac03-560a54fada80)
- Progress payment application: contents and procedure (card_0aaeccf6-9200-4dc2-b836-33758b5e98a3)
- The twin 80% payment floors (9.1.7 / 10.2.4) (card_5dfdafe7-db0b-407d-8671-2a4184bc1fc2)
- Twin 80% rule: sources in both editions (card_7e455790-3711-4427-b515-c40bb7fe96d3)
- Cash-flow protection when payment review runs late (card_25d4e3b6-dcd4-4867-a7df-12783b8e4873)
- Interim settlement by construction stage (Cl. 10.2) (card_d4521708-205e-4ee5-a970-8b3c585d7586)
- Linking stage settlements to the final account (card_8405a93e-f8f6-4d22-8a86-403de1c5037b)
- Performance security vs retention: caps and mutual exclusion (card_63349dff-d73f-4d3e-a241-66310549b5d4)
- Payment of undisputed amounts first (card_415eedf7-9657-4c3e-8059-1ae9f1547df4)
Final account and disputes (8)
- Final account: definition, tiers and basis (card_ba7d74d1-a338-43f5-9b60-8057e3dbfce2)
- The 13 line items of the final account (10.3.2) (card_b80a4d20-5c8f-4f2f-b8db-89b759dbbc8c)
- Consequences when the employer stays silent at final account (card_feb5af9b-883a-4bed-a85f-21720fd91a9a)
- Deemed approval of the final account: three requirements (card_302b266d-80ff-40b0-b73e-968a8485edbf)
- As-built drawings vs construction drawings at final account (card_f06aadca-9a7c-4510-8709-4763aaa02ab6)
- Order of precedence for pricing bases (card_d4631db4-6cb3-40ca-b2f1-4ab03369ef70)
- Pricing deliverables and archiving (Ch.12) (card_18d81f4c-85fc-48c6-ae8b-e831a5f9c624)
- Disallowing duplicated haul costs (card_6a2b14e9-04d4-45f6-ae25-d33e0ea5becf)
Pricing forms and annexes (3)
- Appendix D: pricing statements, four required sheets (card_bfb43f62-ae2d-426a-89a0-4ad5dbc19c29)
- Appendix E: cost summary hierarchy (card_90ce81bd-fa39-4096-bf52-6b251e1a2641)
- Appendix F: progress payment application form (card_4c081ff8-248f-4f9f-8c29-f88e45ee34ae)
FIDIC comparisons (5)
- Delay/EOT/delay damages vs Chinese delay claims (card_5a7d21ea-e6ff-49ce-a6e7-5e8b9ee73cf2)
- Performance certificate vs completion-acceptance chain (card_af602bdf-01db-43aa-b384-7ae4397a3165)
- EOT under FIDIC vs Cl. 8.11 extension claims (card_25f3226e-5763-433d-a086-b7b646dc9a39)
- FIDIC Variation vs Chinese variation/additional works (card_d7cdfd73-ff93-40e9-8d86-6a1f11c082b1)
- The 'experienced contractor' test across Red/Yellow/Silver (card_ec5ee8a0-8cb4-45b1-a82d-17729e3c0e10)
(The group keeps growing as cards are added; each card can be located on the site by its title.)
Keywords
Related Cards
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Should the construction-installation cost in a design estimate carry provisional sums? — the stage division of provisional sums (BOQ/contract level) vs reserve funds (estimate level)
No. The construction-installation cost (works cost) in a design estimate must not carry provisional sums. Provisional sums are a contract-price account of BOQ pricing (construction tendering and implementation) (defined in GB/T 50500-2024, 2.0.13; scope limited by 1.0.2; employer-controlled, unused portions revert, 8.3.1); the estimate's uncertain/unforeseeable costs are carried by the reserve funds (basic + price-difference) in the total estimate, whose composition — works costs + other construction costs + reserves + construction-period loan interest + VAT (T/ZBD 100.3-2022, 4.1.1 and Annex A) — has no "provisional sum" account.
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Evolution of the 28-day time limit for construction claims: GB 50500-2013 'forfeiture of the right to claim' vs GB/T 50500-2024 'may be deemed waived', and the 28-day fallback where the contract is silent
GB 50500-2013 (abolished), Clause 9.13.2: the contractor shall submit a Notice of Claim within 28 days after knowing, or ought to have known, of the claim event; 'if the contractor fails to issue the Notice of Claim within the time limit, it forfeits the right to claim' (hard forfeiture). GB/T 50500-2024 (current, recommendatory), Clause 8.11.3, changes this to submission of the Notice of Claim 'within the period agreed in the contract (28 days if not agreed)', and where overdue, it 'may be handled as agreed in the contract' (soft treatment - the strength of forfeiture is delegated to the contract), plus a catch-all clause: 'where the aggrieved party fails to lodge a claim within the agreed time after the claim event arises, it may be deemed to have waived the relevant construction claim, unless otherwise agreed in the contract or provided by laws and regulations.' Where the contract sets no period, the 28-day limit still applies as fallback (Notice of Claim then report, dual nodes), and the overdue consequence falls under 'may be deemed waived', leaving room for exemption through contrary contract agreement, other provisions of laws and regulations, and the discretionary word 'may'.
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Composition of progress-payment application documents and the submission-signoff procedure (GB/T 50500-2024 §9.4, Appendix F; T11 IESB 0001-2017 Tables 4.1.8/4.1.11; GB/T 50319-2013 §5.3.1)
Application documents fall into four blocks: (1) forms (the Progress Payment Application (Approval) Form F.3.1 in quadruplicate, signed and sealed by the compiler and a Level-1 registered cost engineer + the supervision review form); (2) measurement documents (supervision-signed qualifying completed quantities, BOQ statistical reports, physical progress, quality acceptance; the T11 IESB 0001-2017 caliber: the measurement period runs from the 26th of the previous month to the 25th of the current month, reported by the 26th); (3) price computation (six items: the cumulative completed value of 11 components + cumulative recovered advances + cumulative payable + prior cumulative payments + employer deductions + current payable; the applied amount = in-contract price + change additions/reductions + approved claims - advance/retention and other deductions); (4) construction workers' wages listed separately (wage sheets self-signed; labor-cost disbursement at most monthly). Procedure: contractor submits -> specialty supervision rechecks quantities -> chief supervision engineer endorses for employer approval -> chief supervision engineer issues the payment certificate; disputed items paid first on undisputed parts.
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Price adjustment (for fluctuation) calculation for ready-mixed (commercial) concrete: whole-factor adjustment per m³, adjustment to actual beyond the risk band, and tax treatment (GB/T 50500-2024 Appendix A.2 adjustment based on published price information)
Ready-mixed concrete is adjusted as one whole adjustable factor per m³ (the published price information (government guidance prices) already includes raw-material cost; cement, sand/gravel, and admixtures must not be adjusted separately again, to avoid double counting), using the GB/T 50500-2024 Appendix A.2 adjustment based on published price information: beyond-band unit price difference = Ci - C0×(1+r) on a rise, or C0×(1-r) - Ci on a fall; adjustment amount = unit price difference × Q; the agreed risk band (no-adjustment tolerance, e.g. ±5%) prevails; where not agreed or unclear, fluctuation beyond 5% is the fallback trigger (8.7.2); the price differential attracts value added tax (VAT) only, not management fee or profit (3.3.5); where the tender price differs from the base price (reference price for adjustment), apply the A.2.4 cross-base rule against arbitrage. Worked example: C0=480 CNY/m³, Ci=530 CNY/m³, r=5%, Q=1000 m³; fluctuation 10.4% triggers; beyond-band unit difference 26 CNY/m³; adjustment 26,000 CNY; including 9% VAT the tax-inclusive amount is 28,340 CNY.
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The 28-day source of "silence on final-account verification means acceptance" and the two-edition comparison: GB 50500-2013 (11.3.4, 28 days) -> GB/T 50500-2024 (10.3.8, agreed time)
"Employer silence on final-account verification means acceptance" appears in both editions with different wording: GB 50500-2013 (repealed) Clause 11.3.4 fixes 28 days directly; GB/T 50500-2024 (current) Clause 10.3.8 changes to "within the agreed time ... deemed accepted". A 28-day fallback exists in regulations (former Ministry Order No. 107, Article 16: absent express agreement, 28 days - carried into current MOHURD Order No. 16, Article 18). But payment at the submitted price depends on the contract: Fa Shi [2020] No. 25 Article 21 supports only cases with express contractual agreement; without it, claims resting on the standard/order alone are generally rejected.
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Appendix G main materials (adjustment) list of GB/T 50500-2024: locking stage and adjustment-quantity caliber (contract annex / completed quantities per measurement cycle)
Tables G.2.1-1/2 are filled during tendering and locked as a whole as a contract annex at signing: the tenderer fills scope/base price (market price level 28 days before the bid deadline)/risk band; bidders fill tender prices and agree price data in the tender-letter appendix (3.3.5 item 2, A.2.1). Adjustment quantities are neither tender quantities nor actual purchase quantities but follow "the quantity calculation method the parties specify in the contract" (table note 2, A.2.1); the default framework is quantities corresponding to completed qualifying work in the measurement cycle, measured in segments per adjustment cycle and accumulated (7.1.3).
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Final account deliverables composition, archiving scope, dual-track electronic file requirements, and cost consultants' quality liability (GB/T 50500-2024 Chapter 12 + GB/T 51095-2015 Chapter 8)
Final account deliverables composition per GB/T 51095-2015 8.2.2 (cover, signature page, contents, explanatory notes of the estimate, final account summary table, single-project/unit-work final account summary tables); review deliverables per 8.3.1 (final account review cover, signature page, final account review report, final account approval certification and sign-off form, summary comparison tables). Archiving per GB/T 50500-2024 Section 12.3: deliverables must be archived dual-track as paper originals + electronic files, with electronic files meeting standard data-interface requirements; archiving may be phased or after the final account is completed; handover requires a transfer list signed and sealed by both parties. Consultant quality liability per 1.0.5's three-tier system: the consultant is responsible to the client, and after client confirmation the deliverable counts as the client's toward the other party; deliverables must be prepared by cost professionals and reviewed/signed with the practice seal by Grade-1 registered cost engineers (1.0.4); final account review conclusions are jointly certified and signed off by the employer, contractor, and consultant (GB/T 51095-2015 8.3.8).
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Provisional sums - ownership and use, two editions compared: GB 50500-2013 Section 9.15 vs GB/T 50500-2024 Clauses 2.0.13/8.3.1/8.3.5 - held by the employer, used per instruction, balance to the employer
Both editions share the core logic: the provisional sum is included in the contract price but is held by the employer and used per the employer's instructions; only amounts actually incurred go to the contractor; the unused balance (fully deducted at settlement) belongs to the employer. Three substantive 2024 changes: (1) "used per instructions issued by the employer" is promoted from the 2013 commentary into the body text 8.3.1; (2) new 8.3.5 with dual settlement paths (no adjustment event - fully deducted at settlement; event occurred - declared and verified per Chapter 8, paid per Chapters 9/10); (3) new 9.4.6 concurrent payment with progress payments and 7.2.3 measurement-basis clauses. Peripheral change: 2013 was a mandatory GB (repealed); 2024 is a recommended GB/T.
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Why the all-in unit rate under GB/T 50500-2024 excludes VAT: price-exclusive tax character, separation of net price and VAT, the rationale for listing taxes and duties (VAT under the current standard) separately, and practical reasons
Under GB/T 50500-2024, the all-in unit rate = labour cost + material cost + plant and small tools cost + management fee + profit + risk costs within the agreed scope and risk band (no-adjustment tolerance, e.g. ±5%) (incl. auxiliary work costs), excluding VAT. Four reasons: (1) VAT is a price-exclusive tax (2.0.9), not a production-factor cost of completing the billed (BOQ) item; (2) separation of net price and VAT — unit rates and totals are fully inclusive prices excluding VAT, with taxes and duties (VAT under the current standard) reflected in VAT (3.1.6); (3) taxes and duties listed separately and calculated uniformly — VAT = (bills of work items + bill of preliminaries + bill of provisional sums and other charges, except provisional sums for nominated specialist subcontract works) × the prescribed VAT rate (3.2.11); (4) practically, avoiding "tax on tax" and interfacing with the input VAT credit chain.
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Contractor cash-flow risk control when progress-payment review runs overdue: deemed approval of measurements, payment of undisputed portions, and four-layer defense (GB/T 50500-2024)
Review deadlines are not bottomless: absent contractual deadlines, GB/T 50500-2024 Article 7.1.5 establishes "overdue silence = measurement accepted," Article 9.4.11 "undisputed portions paid first," and Article 9.1.7 payment no less than 80% of cumulative completed work value; overdue non-payment supports claims under 9.4.12, and in extreme cases priority-of-payment under Civil Code Article 807 (exercisable within 18 months) and the Regulation on Payment to SMEs. Defense deploys across four layers: contract clauses - process management - legal remedies - self-rescue financing.
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FIDIC Red Book 2017 EOT (8.5/20.2) vs GB/T 50500-2024 Section 8.11 delay-claim regime: the 28-day cadence, cost-and-time in one case, three-way liability, and the critical-path causation threshold
FIDIC 2017 Red Book EOT (Sub-Clause 8.5; procedure per 20.2) and GB/T 50500-2024 Section 8.11 share one skeleton: (1) both three-stage - "notice ASAP/within 28 days -> periodic supplements for continuing events -> final report within the period" - with FIDIC 20.2.1's 28-day hard bar ("shall not be entitled to any additional payment") against GB 8.11.3's contractual-period-first, 28-day-default, "handled per contract" and general waiver clause; (2) cost and time claimed in one case (FIDIC 20.2 titled "Payment and/or EOT"; GB 8.11.3(3) "shall be asserted together"); (3) three-way liability: employer causes -> time + cost (listed cases plus profit); government/force-majeure-type events -> time extended, losses borne separately; contractor causes -> no extension plus delay damages; (4) causation: FIDIC 8.5's "in the extent that completion is delayed" lands as the critical-path rule (GB 8.11.8: critical-path delay = claimable; non-critical delay exceeding total float turns critical, the difference claimable; still non-critical = no claim), 8.11.7 requiring event-by-event assessment excluding knock-on delays. Main procedural differences: FIDIC notices go to the Engineer who determines; GB runs directly between employer and contractor; FIDIC's 28 days are fixed, GB's 28 days only a default.
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GB/T 50500-2024: definitions of the three pricing methods (unit rate / lump sum / rate-based) and their applicability to each BOQ category
GB/T 50500-2024 provides: work-section BOQ items and day-work items should use unit-rate pricing (quantity x comprehensive rate); measures items should use lump-sum or rate-based pricing; provisional sums and specialist-work provisional amounts should use lump-sum pricing; main-contract services should use rate-based or lump-sum pricing (shared passage of Clauses 2.0.10-2.0.12). Clause 3.1.5 is the catch-all: where unit-rate or lump-sum pricing is unsuitable, rate-based or other methods may be used, with pricing requirements and price-adjustment rules stated in the tender and contract documents.
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Pricing rules for prime-sum estimates (provisional sums) of specialist works: GB/T 50500-2024 VAT-inclusive, lump-sum per item, deduction from the VAT base, and substitution on adjustment (compared with GB 50500-2013)
GB/T 50500-2024 defines the prime-sum estimate of specialist works as "specialist-work costs estimated VAT-inclusive where requirements and price cannot be fixed at tendering" (2.0.15, excluding works directly awarded by the employer), listed under the other-items list, priced by lump-sum per item (3.2.7); the VAT base is the total of work-item, preliminaries, and other-items lists (excluding the specialist prime sum), so VAT is not charged on it again (3.1.6, 3.2.11); on adjustment, mandatory-tender items are wholly replaced by the winning VAT-inclusive subcontract price (8.4.1), others may be priced VAT-inclusive per Section 8.10 or jointly tendered by both parties (8.4.7). Compared with GB 50500-2013's vague "comprehensive prime sum including management fee and profit other than fees and taxes" (Section 4.4), the rules are refined in price basis, pricing-mode classification, VAT treatment, and substitution.
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Overview of material price adjustment in construction works: applicable conditions, base price (reference price for adjustment), risk band, and calculation methods (GB/T 50500-2024 Sections 3.3/8.7 and Appendices A, G)
Four indispensable elements of material price adjustment: ① adjustable scope (only labour cost, principal material cost, and construction machinery fuel and power cost, listed per Appendix G.2 Tables G.2.1-1/2 as a contract annex); ② base price (reference price for adjustment) C₀ (the market price level 28 days before the tender deadline (= FIDIC Base Date), or for non-tendered works 28 days before contract signing); ③ risk band r (contractual agreement takes precedence, in practice 3%–5%; where absent or unclear, a cost fluctuation beyond 5% triggers); ④ quantities subject to price adjustment Q (per the contract's agreed rules). Trigger |Ci−C₀|/C₀>r; upward unit price for the excess beyond the band = Ci−C₀(1+r), downward = C₀(1−r)−Ci; price difference = Σ unit price for the excess beyond the band × Q, carrying value added tax (VAT) only, with no management fee or profit.
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The employer's duty to respond after a contractor's claim: 28-day response period (restarting after supplementary evidence), 14-day window to request evidence, and judicial attitude toward deemed acceptance on silence (GB/T 50500-2024 Clause 8.11.5)
The employer shall reply in writing with its handling opinion within the contractual period (28 days if silent) after receiving the contractor's claim report or supplementary evidence; if it deems evidence insufficient, it shall request supplements in writing within the contractual period (14 days if silent) after receiving the claim notice, and the response period restarts as a new 28 days from receipt of the supplementary evidence. If the employer fails to respond, the contract may deem the claim accepted; absent such a clause, relying on GB/T 50500-2024 (a recommended standard) alone for "deemed acceptance" - judged by the three elements of Fa Shi [2020] No. 25 Article 21 (express contractual agreement + duly served complete documents + no reply within the period) - is rejected by most courts. The supervision procedure (DBJ41/T 208-2018 Clause 9.4.4) matches: the supervisor reviews and forwards the claim within 14 days, and the employer issues a signed claim decision within 28 days of receiving the report or further evidence, failing which the claim is deemed accepted.
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Main-material price surge beyond the risk band: sequencing between GB/T 50500-2024 Section 8.7/Appendix A price adjustment and Civil Code Article 533 change of circumstances
When main-material prices surge far beyond the contractual risk band, first complete price adjustment per GB/T 50500-2024 Section 8.7 and Appendix A (agreed risk band first; 5% fallback when unspecified/unclear; portions beyond the risk band at actual values, differences carrying VAT only, no management fee/profit); only the residual loss still grossly unfair after adjustment proceeds to 8.7.3 negotiation, and failing negotiation to Civil Code Article 533 modification or termination — a "contract first, statutory fallback" progression, not either-or. Judicial appraisal per GB/T 51262-2017 5.6.2: as agreed if agreed; adjustable but without an agreed risk band — the appointing party decides judicial appraisal per the national standard (unless already index-adjusted); agreed non-adjustable — government-priced/guided materials appraised per old Contract Law Article 63 (now Civil Code Article 513).
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Whether the employer's overdue non-reply to the final account documents is deemed acceptance of the submitted amount - the three-requirement test of Fa Shi [2020] No. 25, Article 21, and interface with GB/T 50500-2024
Where the contract stipulates 'overdue non-reply is deemed acceptance', under Fa Shi [2020] No. 25, Article 21, the people's court shall support the contractor's claim for settlement per the final account documents (submitted price); three requirements must be met simultaneously: an express contractual stipulation, delivery of complete settlement documents, and no reply within the agreed period. Absent such stipulation, claims based only on ministerial rules or model contract texts containing 'deemed acceptance' wording are not supported by the SPC and the overwhelming majority of courts. GB/T 50500-2024, Clause 10.3.8, points the same way but is a recommendatory national standard that becomes a contractual obligation only when incorporated by the contract; at the rule level, Article 16 of the former MOC Decree No. 107 has been carried over by Article 18 of MOHURD Decree No. 16, with 28 days as the default period absent agreement.
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GB/T 50500-2024 comparison of specialist-work provisional amounts (VAT-inclusive) and material provisional prices (VAT-exclusive): listing, taxation, and adjustment rules
Under GB/T 50500-2024 "Standard for BOQ pricing of construction works": the specialist-work provisional amount is a VAT-inclusive price (listed in other items, deducted from the VAT computation base to avoid double taxation, replaced wholesale by the successful VAT-inclusive subcontract price at adjustment); the material provisional price is a VAT-exclusive pre-tax unit price (entered into the comprehensive rate of a work-section item, VAT charged normally on the VAT line, adjustment limited to the pre-tax material difference within the comprehensive rate). The two have opposite tax calibers and differ in listing, taxation, and adjustment — mixing them double-counts or omits VAT.
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Bid-price clarification or explanation mechanism in GB/T 50500-2024 (Section 3.5): seven arithmetic-error correction rules and omitted/unpriced items, vs GB 50500-2013 Clauses 6.1.4/6.2.7
GB/T 50500-2024 adds Section 3.5 "clarification or explanation of bid prices": between opening and award, bidders may be asked to clarify arithmetic errors, minor deviations, price reasonableness, and completeness (omissions), but the total bid and substantive contents are locked (no change to scope, duration, contract conditions, total price, or bid duration). 3.5.2 gives seven arithmetic-correction rules (words over figures, total over list sum, prime sums per the tender list, unit price over amount, etc.); 3.5.4 provides that omissions in lump-sum/preliminaries/per-item lists are deemed included in other items and the total, while unit-price work-item omissions may be clarified and added with the amount deducted from the preliminaries total - replacing 2013's coarse treatment under 6.1.4 (mandatory) and 6.2.7 ("reject the bid, or deem included with no settlement adjustment").
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Full-process handling rules for prime cost (PC) sums for materials included in the all-in unit rate across tender, performance and settlement (GB/T 50500-2024)
For prime cost (PC) sums for materials (tax-exclusive unit prices), tenderers must include them in the all-in unit rate as stated in the BOQ without unilateral alteration, and separately include safekeeping, secondary handling and loss costs and list them in Table E.2.3; during performance, after the winning tender price or the employer's approval of material prices, only the material PC sum item within the all-in unit rate is replaced, with other costs not adjusted; such items are not subject to the general adjustment for cost fluctuation under Clauses 8.7.2–8.7.4; for settlement and construction cost expert assessment (judicial appraisal), the material price confirmation sheet / winning tender basis serves as the price-adjustment voucher.
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GB/T 50500-2024 rules for adjusting price differences, management fee, and tax after the actual price of provisionally priced materials/equipment is determined (Section 8.4)
Per GB/T 50500-2024 Section 8.4, once the actual price of provisionally priced materials (including engineering equipment) is determined, only the material provisional-price item in the all-in unit rate is adjusted (pre-tax difference = confirmed actual pre-tax unit price − provisional pre-tax unit price, times quantity); labor, machinery, management fee, profit and other costs are not adjusted; VAT is charged additionally on the difference and the contract price is adjusted. Replacement price: for items subject to mandatory tendering by law, the pre-tax winning purchase price replaces it; otherwise, the pre-tax inquiry/own-quote price confirmed by the employer. Specialist-work provisional prices are VAT-inclusive, replaced wholesale by the winning VAT-inclusive subcontract price — a different rule.
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Price adjustment for wires and cables: itemized by full specification, copper-linkage agreements, and handling missing published price information (government guidance prices) (GB/T 50500-2024 Appendix A.2)
Cable price adjustment shares the same mechanism as steel (GB/T 50500-2024 Appendix A.2 adjustment based on published price information (government guidance prices)): difference = SUM[(Ci - C0 x (1 +/- r)) x Q], only the portion exceeding the risk band is adjusted on an actual basis; r as agreed takes precedence, and if not agreed, fluctuation beyond 5% is adjustable (8.7.2); C0 = market price 28 days before the tender deadline (= FIDIC Base Date) (for non-tendered projects: 28 days before contract signing); the difference carries value added tax (VAT) only, no management fee or profit. Cables must be listed item by item in Table G.2.1-1 by full specification (voltage class x cores x cross-section x armor x flame-retardance) and adjusted separately — merging and averaging is strictly prohibited; the copper-linkage method must fix in the contract the copper content/conversion coefficient and the copper-price source; for missing published price information, the paths are employer's approval of material prices / market price enquiry, with symmetric unit bases.
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Derivation of new (built-up) rates when a design change changes the construction process (construction method): qualifying the source + the three-tier path of GB/T 50500-2024 clause 8.9.1
"Change of construction method" is a price-impact factor of "item description change" expressly listed in GB/T 50500-2024 8.9.1: process changes caused by design changes or employer requirements are variations requiring derivation of new (built-up) rates; a contractor's autonomous process switch is construction method statement optimization, generally not adjusting the contract price, costs borne by the contractor itself. Pricing follows three tiers: identical conditions + identical item descriptions retain the contract unit rate; similar item descriptions/conditions convert via the original all-in unit rate analysis, replacing only differing elements; different item descriptions/conditions (complete method change) negotiate at "reasonable cost + profit" with a new all-in unit rate analysis. Confirm the pricing path in writing before implementation and keep evidence; accompanying quantity changes beyond 15% (exclusive) follow 8.9.2 — for increases, reasonably reduce; for decreases, reasonably increase.
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The undisputed-portion-first payment principle in price disputes: progress payment, final account, and wage protection
Where the project price is disputed, the undisputed portion must be paid first: at the progress payment stage, payment certificates are issued and paid for undisputed BOQ items per GB/T 50500-2024, Clause 9.4.11; where final account re-checking raises objections, the unobjected portion undergoes a partial final account (incomplete final account) first (10.3.7); additional works (10.1.8) and quality disputes (10.3.14) may not delay the undisputed portions; and labor costs may never be withheld under any dispute per Article 35 of the Regulations on Wage Payment for Migrant Workers. The disputed portion itself goes negotiation -> review/mediation -> arbitration/litigation.
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Whether increased pipeline quantities caused by BIM coordinated layout can adjust the work quantities: determined by attribution in the deepening design (contractor's own deepening design — no adjustment; only where it constitutes a variation is adjustment made)
Whether the quantities of pipelines increased by BIM coordinated layout can be adjusted depends on attribution: differences arising from the contractor's own deepening design are generally not adjusted (GB/T 50500-2024, Clause 3.3.9; T/ZBD 100.4-2023, Clause 4.4.6), except where the contract provides for settlement on the basis of the deepened drawings; where the employer so requires, or where it constitutes a variation confirmed upon review by the original designer, adjustment is made per Chapters 7/8/9, and where the quantity difference exceeds 15%, the unit rate is adjusted per Clause 8.9.2.
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Four-tier progressive identification of high-risk bid-pricing clauses in tender documents (rejection clauses -> substantive requirements -> price locking -> performance funding)
Read tender documents as risk-allocation contracts: (1) rejection clauses (the seven statutory grounds of Implementation Regulations Article 51 as baseline, sector measures expand with catch-all clauses; below-cost is the hidden trap); (2) substantive requirement clauses ("must/shall/shall not" wording + deviation tables—non-response is statutory rejection); (3) price-locking clauses (GB/T 50500-2024: risk-scope clarification, three elements of price adjustment, lump-sum by total, lump-sum per item, preliminaries responsibility, unbalanced bidding); (4) performance funding clauses (Article 3.4.8 14-item checklist, performance deposit <=10%, seven quality-reserve agreements).
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Appendix F Table F.3.1 progress-payment application (approval) form of GB/T 50500-2024: structure, six reporting items, and prepayment deduction entries
Table F.3.1 is a six-row form (each row with application/verification amount columns) matching the six items of 9.4.9: (1) cumulative completed gross value (11 sub-items), (2) cumulative recovered prepayments (incl. current), (3) cumulative payable progress payment, (4) prior cumulative paid progress payments, (5) amounts the employer should deduct, (6) current payable progress payment. Prepayment deduction goes in row 2 "cumulative recovered prepayment" (cumulative figure); current deduction = current cumulative minus prior cumulative, also part of row 5; progress payments shall not recover safety-production measure prepayments (9.1.7). Four copies; preparer and Grade-1 registered cost engineer sign and seal; contractor representative, supervising engineer, and employer representative sign or seal.
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Steel price adjustment calculation: price-information adjustment formula, per-specification per-period threshold checks with adjustment on actual basis, and tax treatment (GB/T 50500-2024 Appendix A.2)
Steel price adjustment uses the price-information adjustment method (GB/T 50500-2024 Appendix A.2): △P = Σ[(Ci − C0·(1±r)) × Q] × (1 + VAT rate), adjusting only the portion beyond the risk band on an actual basis; the agreed risk band prevails, with the beyond-5% fallback where not agreed or unclear (8.7.2). Each specification must be checked independently each period for exceeding the risk band (base prices, published price information, and increase rates differ; specifications within the risk band are not adjusted for the period); the price difference carries VAT only, no management fee or profit (3.3.5); when checking adjustment tables, first look at whether the bid price is above or below the base price (A.2.4 determines the excess-calculation base).
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Adjusting all-in unit rates at the +/-15% quantity boundary: GB/T 50500-2024 Clauses 8.9.1-8.9.3 and the reading of the wording change from repealed GB 50500-2013 Clause 9.6.2's "tiered pricing"
Under GB/T 50500-2024 (unit-price contracts): within 15% (inclusive) per 8.9.1's five tiers (same characteristics + same conditions -> contract rate; similar -> converted; different -> negotiated market rate); beyond 15% per 8.9.2, "accounting for the purchase-price discounts gained by increased quantities (or lost when decreased), reasonably lower (or raise) the contract rate and new composite rates" - more quantity lowers the rate, less raises it. The repealed 2013 Clause 9.6.2 explicitly said "the rate of the increased portion shall be lowered; the rate of the remaining portion after decrease shall be raised" (tiered: within +/-15% unchanged); 2024 drops "portion" and does not say whether the tiered or whole-quantity repricing applies - a genuine ambiguity; being a recommended standard, contract terms govern - lock the tiered basis in the special conditions.
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GB/T 50500-2024 abolishes site instructions (xianchang qianzheng): out-of-contract work now goes through variations / new works / dayworks, and statutory time limits become contractual
GB/T 50500-2024 deletes the 2013 Section 9.14 "site instructions" with its statutory defaults (submit the instruction report within 7 days; verify within 48 hours; silence = acceptance); the word survives only in the daywork instruction report of 7.5. Price adjustment now proceeds per the 11 items of 8.1.1, with out-of-contract work split into three channels: changes to in-scope work content -> variations (8.9); physical works outside the contract scope -> new works (8.10, re-negotiable pricing with supplementary agreement); sundry work unsuitable for drawing-based measurement -> dayworks (7.5 measurement, 8.6 pricing, 7.5.2 lists 10 applicable cases). Procedural time limits all become "the agreed time" and must be written into the contract - silence leaves no fallback; 7.5.5 keeps the deemed-acceptance mechanism on silence.
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The non-equivalence of FIDIC 2017 Red Book delay machinery and the national-standard delay regime: delay fact / EOT / Delay Damages vs delay claims / extensions / delay damages / liquidated damages
Not equivalent. FIDIC never treats delay as a single term: it is a chain "delay fact -> attribution -> (EOT 8.5 or Delay Damages 8.8)", while the national standard splits the same chain into separate tools - delay claims, delay damages, liquidated damages. At the fact level (neutral time fact) the systems agree; at the time-relief level they are isomorphic (FIDIC 8.5 EOT <-> GB/T 50500-2024 delay claim/extension); at the money-penalty level they look alike but differ in core: FIDIC 8.8 makes Delay Damages the "only damages" for late completion (except fraud, gross negligence, deliberate default, reckless misconduct, and 15.2 termination), while GB 8.11.19 lets the employer "choose one or more" (extended warranty / extra cost / delay damages / liquidated damages) cumulatively. GB/T 50500-2024 term 2.0.33 renders delay damages as "delay damages" in English - masking the exclusivity difference. Both systems share the 28-day procedure (FIDIC 20.2.1 bar; GB 8.11.3/8.11.4 defaults plus deemed waiver/acceptance).
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Measurement linkage between GB/T 50500-2024 and the nine measurement standards GB/T 50854-50862-2024: responsibilities, cycles, and the division of procedures (procedures to the pricing standard, quantity take-off to the measurement standards)
GB/T 50500-2024 and the nine measurement standards (GB/T 50854-50862-2024) interlock by mutual delegation on measurement: 50500 7.1.1 states quantities "shall be calculated per the national and industry measurement standards and supplementary rules agreed by the parties" (take-off to the measurement standards); 50854 3.0.2 reciprocally requires measurement during implementation to also comply with GB/T 50500 (procedures to the pricing standard). Measurement responsibilities (contractor written submission -> employer written verification -> mutual deemed acceptance, 7.1.5/7.1.6; per-cycle summary sign-off 9.4.13), measurement cycles (cycle aligned with payment cycle, monthly fallback when unclear, 9.4.1; milestone measurement 7.1.2; price-adjustment segmented measurement 7.1.3) are all governed by 50500 Chapter 7 and Section 9.4; the nine standards cover only item classification, units, and appendix calculation rules (50854 4.2.6: per Appendices A-Q).
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"Tender control price" and "tender price ceiling" are one and the same thing: term unification in GB/T 50500-2024 and the 2013→2024 changes in preparation requirements (basis of preparation, price sources, publication requirements, reasonable construction duration)
"Tender control price" and "tender price ceiling" are one and the same thing: GB/T 50500-2024 China national pricing standard for BOQ (effective 1 September 2025) uniformly renames the "tender control price" of the GB 50500 system as the "tender price ceiling" (ceiling price, Clause 2.0.19) and deletes the former term; Clause 3.3.1 of GB/T 50875-2013 had already defined the "tender control price" as "the tender price ceiling of the tendered works". Changes in preparation requirements: (1) the basis of preparation (Clause 5.2.1, eight items) no longer centres on "pricing quota norms + published construction cost information" but on "provisions on measurement of the works and pricing + project price information, construction cost data and indices", so that preparation may be based on market price information and construction cost data; (2) price sources (Clause 5.2.8) are opened up to six categories of market-based information (tender price ceilings, construction-drawing based budgets (pre-tender estimates), design estimates (approved cost ceilings) and cost estimates of similar works, competitive tender unit rates, settlement unit rates, contract prices, market price enquiry, price indices); (3) the publication requirement (Clause 5.1.1) makes it clear that the total price and the basis and method of preparation are to be published when the tender documents are issued; (4) a reasonable construction duration dimension is added (Clause 5.2.1 item 6 and the final paragraph).
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GB/T 50500-2024: both progress payments and process-settlement payments floored at 80% — the wording contrast between 9.1.7 "should not be lower" and 10.2.4 "shall not be lower"
Under GB/T 50500-2024, the payment-ratio floors for progress payments and construction-process settlement payments are both 80%, with different force: Clause 9.1.7 on progress payments — "where the contract does not state a payment ratio for the works value, the ratio should not be lower than 80% of the cumulative completed works value" — "should" is recommendatory: agreement prevails, the 80% floor applies only absent agreement; Clause 10.2.4 on process-settlement payments — "the payment ratio shall be agreed in the contract and shall not be lower than 80% of the current process-settlement total" — "shall not" is a prohibitive hard floor: even an agreed ratio below 80% fails the standard. The bases differ: progress payments on "cumulative completed works value", process-settlement payments on "current process-settlement total".
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Scope of GB/T 50500-2024: state-funded works shall use BOQ pricing (compulsion now carried by MOHURD Order No. 16), others should/may choose freely, compared with GB 50500-2013
Per GB/T 50500-2024 Clause 3.1.1: works invested with fiscal or state-owned funds "shall" prepare BOQs per national and industry measurement standards and use BOQ pricing; non-state-funded works "should", and may choose other methods (3.1.5 allows percentage-fee and other pricing where unit-price/lump-sum pricing is unsuitable, provided the pricing requirements and adjustment rules are stated in tender and contract documents). The 2024 edition changed from a mandatory GB (50500-2013) to recommended GB/T - "must" became "shall", mandatory provisions repealed - but the practical rule "state-funded works must use BOQ pricing" is not relaxed: compulsion is carried by Article 6 of the "Measures for pricing of construction contracting" (MOHURD Order No. 16): such works "shall adopt BOQ pricing".
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GB/T 50500-2024 Chapter 11 contract-price dispute resolution procedure: the amicable negotiation → dispute review/mediation → arbitration/litigation progression (compared with the repealed GB 50500-2013 Section 13.1 the Engineer's 14-day interim-determination mechanism; including the deletion of the construction cost expert assessment chapter, now carried by GB/T 51262-2017)
GB/T 50500-2024 Chapter 11 provides that contract-price disputes escalate "amicable negotiation → dispute review or mediation → arbitration or litigation": supplementary (settlement) agreements signed upon negotiation bind both parties (11.1.1); failing agreement, dispute review or mediation is preferred, with the review board (or body)/mediator (or body) jointly selected by the parties and free of conflicts of interest with either (11.1.2–11.1.4); failing that, arbitration or litigation per the contract — their final decisions are legally binding on employer and contractor and must be jointly observed (11.1.5, 11.4.6); where a party fails to implement a jointly confirmed review opinion or mediation statement, the other may submit the dispute to arbitration or litigation (11.4.5). The 2024 edition deleted wholesale GB 50500-2013 Section 13.1's pre-stage "the Engineer/cost engineer interim determination" (original rule: interim result notified within 14 days of submission; no confirmation within 14 days deemed acceptance) — whether an interim stage exists now depends entirely on the contract; the foreword's revision item 9 also "deletes the construction cost expert assessment chapter" (the former Chapter 14), that business being carried by the standalone GB/T 51262-2017 "Code for Construction Cost Expert Assessment (Judicial Appraisal)" — the pricing standard no longer duplicates it.
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Appendix A price adjustment (for fluctuation) methods for changes in costs, GB 50500-2013 vs GB/T 50500-2024: weighting coefficient basis and adjustment threshold differences
The two editions share the same formula skeleton in Appendix A (index-based (formula) adjustment dP = P0[A + sum BiFit/Fi0 - 1]; adjustment based on published price information adjusts the portion beyond the risk band (no-adjustment tolerance, e.g. ±5%) at actual values); differences lie in the basis and mechanisms: (1) weighting — 2013 variable weights are 'proportions of the total tender price in the tender letter' (including VAT), 2024 uses 'weights of the contract price excluding VAT' (separation of net price and VAT), and 2024 adds A.1.4 fallback 'where variable weights are not agreed, the corresponding weights of the tender price ceiling may be used' and A.1.1 merges the fluctuation range into the base price index F0; (2) thresholds — both editions' fallback is 5% (beyond which actual-value adjustment applies; 2013 clause 9.8.2, 2024 clause 8.7.2), and 2024 adds the sign rule for the r risk band coefficient, defines the base price (reference price for adjustment) as the market price 28 days before the tender deadline (= FIDIC Base Date) (28 days before contract signing for non-tendered works), and the 8.7.6 list of items not subject to price adjustment. GB 50500-2013 was mandatory (replaced); 2024 is recommended national standard GB/T.
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Price-difference calculation method after material prices exceed the risk band (price-information adjustment method, GB/T 50500-2024 Appendix A.2)
The excess beyond the risk band is adjusted per actuals: when prices rise, unit price difference = Ci - C0 x (1 + r); when prices fall, = C0 x (1 - r) - Ci; adjustment amount = unit price difference x adjusted quantity Q; where the contract does not agree a risk band, fluctuation beyond 5% triggers adjustment (Clause 8.7.2); where the bid price differs from the base price, the cross-basis rule of A.2.4 applies to prevent arbitrage; the price difference carries VAT only, with no management fee or profit.
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Setting rules and compliance red lines for the performance security and the quality retention (retention money): 10%/3% caps, mutual exclusivity before completion, and the boundary allowing coexistence at final settlement
The performance security guarantees contract performance, capped at 10% of the awarded contract amount (Implementation Regulations of the Tendering and Bidding Law, Article 58); over-collection may be ordered to correct and fined up to RMB 50,000 (Article 66). The retention money guarantees repair obligations during the defect liability period, capped at 3% of the total project price settlement amount (GB/T 50500-2024 Clause 10.5.1 and Jianzhi [2017] No. 138 Article 7, with a bank guarantee substitute also capped at 3%); the defect liability period is generally 1 year, 2 years maximum. The mutual-exclusivity red line is time-divided: before completion a retention must not be reserved while a performance security has been paid; but at final settlement a retention of up to 3% of the total settlement price may still be reserved (the performance security covers construction-period performance while the retention covers defect-period repairs — different guaranteed objects may coexist); where an engineering quality guarantee or quality insurance is adopted, the employer must not further reserve retention money. At the end of the defect liability period, final clearance is handled, the remaining retention is returned, and interest should not be calculated (GB/T 50500-2024, Clause 10.5.5).
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Disallowance grounds on final-account review for double counting of earthwork haul distance: the all-in unit rate cost envelope under GB/T 50500-2024 + the "disposal of surplus (excavated) material" itemisation basis in the measurement standards
Earthwork loading and haulage costs are already included in the corresponding billed (BOQ) items' all-in unit rates (GB/T 50500-2024 2.0.9, 3.1.6); haul distance is an item description (work item specification) — where the description states a distance, the contract unit rate has locked the corresponding transport cost, and without a variation or BOQ error no separate charge is allowed (8.9.1 item 1, 7.2.1); duplicated haul costs fall within none of the 13 final-account adjustment categories (10.3.2) and shall be disallowed. Off-site haulage can only be itemised as "disposal of surplus (excavated) material" (GB/T 50854-2024 A.4.13, GB/T 50857-2024 A.4.6); excavation work content covers on-site haulage only.
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Preliminaries — the "lump sum, no adjustment" principle and the full landscape of adjustable exceptions (GB/T 50500-2024 cl. 3.3.7, 7.3.1)
Under GB/T 50500-2024, the China national pricing standard for BOQ (Code of Valuation with Bill of Quantities of Construction Works), preliminaries follow a lump-sum no-adjustment principle, reflected at three levels: (1) the construction method statement reported at tendering is deemed reasonable and feasible, the cost is priced as a lump sum, and the contractor bears the risk of cost increases arising from adjusting its own method statement (cl. 3.3.7); (2) preliminary items in the priced BOQ shall not be re-measured or adjusted (cl. 7.3.1); (3) preliminaries are not adjusted for changes in costs (cl. 8.7.6 item 3). Exception channels: preliminary works listed as billed (BOQ) items and items the contract requires to be measured (cl. 7.2.1, 7.2.2); statutory safety provisions (per contract); variations (measured per cl. 7.4.4, priced per cl. 8.9); errors and omissions in the BOQ (cl. 8.2.2, 8.2.3); unforeseeable works within provisional sums (cl. 7.7.2); delayed use, removal/re-installation, increase or duplicated provision of the contractor's preliminary items due to the employer, and material changes to the time for completion (costs borne by the employer, cl. 3.3.7). Under re-measurable (unit-rate) contracts, only the statutory safety provisions and BOQ-listed formwork/temporary works etc. are adjustable for BOQ errors and omissions (cl. 8.2.2). Adjustments require "submitting the method statement for confirmation before implementation" (cl. 8.9.6); late submission is deemed waiver, and the other party's late confirmation is deemed acceptance (cl. 8.9.7).
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Cement price adjustment calculation: determining the adjustment object by usage path (site-mixed / ready-mixed concrete / direct purchase) + price-information adjustment method formulas and caliber points (GB/T 50500-2024 Appendix A.2)
Cement adjustment first fixes the object by usage path: site-mixed concrete/mortar and direct purchase adjust cement (CNY/t, quantity per mix-ratio cement usage or the employer-confirmed purchase quantity), ready-mixed concrete adjusts concrete (CNY/m3) with cement not separately adjusted (the published price information already includes raw-material costs, preventing double-counting). Formulas (Appendix A.2): rising overrun unit price difference = Ci − C0×(1+r), falling = C0×(1−r) − Ci, amount = unit price difference × Q; absent an agreed risk band, fluctuation beyond 5% triggers (8.7.2); the price difference carries VAT only, without management fee or profit (3.3.5); bagged/bulk calibers consistent, listed by type and strength grade, rising and falling adjusted symmetrically in both directions.
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Risk allocation and adjustment rules for preliminaries (measure) costs: GB 50500-2013 vs GB/T 50500-2024 (omitted items, scheme changes, lump sum plus exceptions)
The 2024 edition restructures preliminaries as "lump sum plus exceptions": completeness/accuracy of the preliminaries list is the contractor's responsibility under both unit-price and lump-sum contracts (3.1.8); omitted items are no longer adjustable except the safety-measures cost and formwork/temporary works listed in the work-item list (8.2.2/8.2.3), whereas under 2013 list omissions were the tenderer's liability (4.1.2, mandatory) and missing preliminaries could be added via an approved scheme (9.5.3). "All preliminaries risk on the contractor" is inaccurate - exceptions like variations, unforeseen provisional-sum works, and employer causes still cost the employer (3.3.7), but only via "submit scheme before execution + mutual confirmation" (8.9.6/8.9.7), failing which the right is forfeited.
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GB/T 50500-2024 vs GB 50500-2013 edition change: all-in unit rate composition changes and the repositioning of statutory levies and fees and taxes and duties in the BOQ-based pricing system
The 2024 edition removes "statutory levies and fees" entirely from the BOQ system (no longer listed; the mandatory "shall not be competitive" clause canceled); taxes and duties become value added tax (VAT) listed separately at the summary level (= total of summarized list prices x VAT rate); the all-in unit rate is explicitly a fully inclusive price excluding VAT (labour cost + materials + plant and small tools cost + management fee + profit + agreed-scope risk + indispensable auxiliary work costs); "overheads (company and site)" is renamed "management fee". The 2013 edition excluded statutory levies and fees and taxes and duties indirectly via mandatory provisions of codes; 2024 declares "excluding VAT" directly in the term definition. The standard changed from mandatory GB to recommended GB/T, effective 2025-09-01 with the 2013 edition abolished.
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GB/T 50500-2024 list of measurement and pricing risk allocation: Clause 3.3.2 seven employer-borne risks, Clause 3.3.3 eight items for the contractor's tender, and the Clause 6.1.8 tender link
Under GB/T 50500-2024, Clause 3.3.2 lists 7 employer-borne risks (errors and omissions in the BOQ of a re-measurable contract, errors in the employer's original data and datum, approved variations, directed acceleration/early completion/suspension or slowing of the works, changes in laws, regulations and policies, cost fluctuation beyond the agreed range, others), which the contractor's tender need not consider; Clause 3.3.3 lists 8 items the contractor shall consider in its tender (accuracy and completeness of the bill of preliminaries, errors and omissions in the BOQ of a lump-sum contract, the cost of completing all work per the contract drawings, specifications and measurement standards, changes to the contractor's own scheme, causes attributable to the contractor's own plant, technique or management, the contractor's own acceleration or suspension, cost fluctuation within the agreed band, others). The contractor bears its own technical and management risks (e.g. management fees) and a certain market risk, but not the risk of changes in laws, regulations and policies; the tender price shall include the risk costs within the agreed ranges (6.1.8), and where the tender documents are silent, bidders shall seek written clarification from the employer within the prescribed time.
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The "double 80%" rule for progress-payment and in-process settlement payment ratios: GB/T 50500-2024 Clauses 9.1.7 and 10.2.4 vs GB 50500-2013 Clause 10.3.7 (60%-90%)
GB/T 50500-2024 raises the payment floor from 2013's 60% to 80% and removes the 90% cap, forming "double 80%": progress payments (9.1.7) - where the contract is silent, preferably not below 80% of the cumulative completed work value; in-process settlement payments (10.2.4, new in 2024) - not below 80% of the current in-process settlement amount. The two 80s differ in force: the progress-payment one is a fallback when the contract is silent ("preferably not below"); the in-process one is a floor that contractual agreement cannot breach ("shall not be below").
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GB/T 50500-2024 replacing GB 50500-2013: what GB becoming GB/T means, expiry of the 2013 mandatory provisions, and the 2025-09-01 effective date
MOHURD Announcement (No. 212 of 2024, issued 2024-11-26) approved the "Standard for measure and valuation of construction work with bills of quantities" as national standard GB/T 50500-2024, effective 1 September 2025, repealing GB 50500-2013 simultaneously. GB = mandatory national standard, GB/T = recommended (Standardization Law, 2017 revision, Article 2: mandatory standards must be executed; adoption of recommended standards is encouraged); all 2013 mandatory provisions expire with the standard, and the 2024 edition sets no mandatory provisions. Typical contrast: 2013 Clause 3.1.1 (mandatory) "works contracted with state-owned funds must use BOQ pricing" becomes 2024 3.1.1 with fiscal/state-funded works "shall" and others "should" use BOQ pricing. The binding force of a recommended standard is realized through incorporation in tender documents and contracts.
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Main contractor's attendance and coordination fee: bases to which percentage rates are applied and rates — calculation bases for the three service targets, the C = A × B pricing formula, construction payment settlement adjustment, and tender price ceiling estimation (GB/T 50500-2024)
Main contractor's attendance and coordination fee = calculation base A × rate B (or a lump sum entered directly under a total-price package). Bases for the three targets: (1) materials/works equipment provided by the employer (free-issue) -> supply contract price; (2) specialized subcontracted works (within the contract, not executed by the contractor) -> the subcontract's contract price; (3) directly awarded specialized works (outside the contract) -> that specialized works' contract price. The national standard sets only rules, not rates; where the fee is priced per item the risk is lumped and no adjustment is made in the construction payment settlement, while where it is priced by rate and no base is agreed, it may be adjusted in the construction payment settlement on the contract price. Local rate references (Hubei 2024 norms for on-costs and expenses): pure management and coordination 1.5%, with attendance services 3%–5%, employer-supplied (free-issue) materials 1% of value.
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In-process settlement linked to final account: preliminaries and main-contract service fees are interim payments that must be recalculated at final settlement (GB/T 50500-2024 Clauses 10.2.3/10.2.7/10.3.3)
For projects with in-process settlement, preliminaries costs (and main-contract service fees) must be recalculated at final account - amounts listed in in-process settlements are only "interim payments", not a final-account basis, and are adjusted up or down per the recalculation (GB/T 50500-2024 10.2.3, 10.2.7, 10.3.3). But recalculation does not mean repricing: all preliminaries of the completed works (incl. safety-measures adjustments) are recalculated per Section 7.3 and Chapter 8 against the priced-list amounts, checking the five exceptions of 7.3.1 - absent exceptions, the result still equals the priced-list amount. Substantively consistent with GB 50500-2013's "lump-sum preliminaries per the priced list"; 2024 merely hard-codes the in-process-to-final linkage procedure.
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Item description vs method of measurement in the BOQ: the item description column must not stipulate the method of measurement; supplementary rules belong in the BOQ calculation-rules statement and apply as contractual agreement
Item description and method of measurement are two parallel, independent elements of the bill of quantities (BOQ): the item description must be drafted in accordance with the annexes to the measurement standard and the actual works, its function being to fix the all-in unit rate; quantities must be computed under the method of measurement prescribed in the annexes (mandatory provisions of codes) — the item description column must not stipulate the method of measurement. Where supplementary rules are genuinely required, they must be set out in the BOQ calculation-rules statement (naming the national and industry standards adopted, with their titles and numbers, or setting out the detailed supplementary rules) and made part of the tender documents/contract documents, applying as "contractual agreement". Hierarchy of measurement bases: contractual agreement -> national standard matching the contract type -> industry/local standard.
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GB/T 50500-2024 rules for determining the base date: agreement first; tendered works = 28 days before the tender deadline, non-tendered works = 28 days before contract signing (term 2.0.21)
The base date (GB/T 50500-2024 term 2.0.21) is the date on which the contractor, during the tender period, determined the tender total price, the BOQ all-in unit rates and their sums, and it serves as the price datum for adjustment for changes in costs and for adjustment arising from changes in laws, regulations and policies. Determination order: agreement first, statutory fallback — where the tender documents (inquiry documents for non-tendered works) and the contract are silent, tendered works take 28 days before the tender deadline (= FIDIC Base Date) and non-tendered works 28 days before contract signing. That point is at once the base period of index-based (formula) adjustment (A.1.6), the base price C₀ of adjustment based on published price information (A.2.1), and the common starting point for adjustment for changes in laws, regulations and policies (8.8.1).
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GB/T 50500-2024 Appendix E pricing cost summary: Table E.1.1 summary hierarchy (project → single project → unit work) and aggregation rules for billed items, preliminary items, other charges and VAT
GB/T 50500-2024 Appendix E contains a single general summary table — Table E.1.1 "Project summary table" — using three-level numbering (1 → 1.1 → 1.1.1) to express the project → single project → unit work hierarchy; Note 2: "This table is preferably used for the summary calculation of works where the contract subject is the object of preparation of the bill of quantities; works where a single project or unit work is the object of preparation of the bill of quantities may also be summarised using this table." Aggregation rules: billed (BOQ) item costs (the only level expanded down to unit-work detail) roll up level by level; preliminary items (with 2.1 safety-production preliminary items listed separately) and other charges (broken out into provisional sums / provisional sum for nominated specialist subcontract works / dayworks / main contractor's attendance and coordination provisions / other items agreed in the contract) are summarised at whole-project level; VAT is listed separately and its calculation base excludes the provisional sum for nominated specialist subcontract works (Note 1); total = 1+2+3+4. All-in unit rates are fully inclusive prices excluding VAT (Clause 3.1.6, term 2.0.9); statutory levies and fees are no longer listed separately in the 2024 edition, having been merged into management fee; settlement follows Table E.6.1, with amounts adjusting for errors and omissions in the BOQ entered respectively under "contract price adjustment amount" of billed items and preliminary items.
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Framework for distinguishing quantity risk from price risk in contracts: risk objects, responsible parties, and quantified trigger lines (GB/T 50500-2024)
Quantity risk governs "how much is built" (BOQ defects, quantity changes and item additions/deletions from changes); price risk governs "how much per unit" (input prices and all-in unit-rate levels). On allocation, Article 3.3.2 lists owner risks (unit-rate BOQ defects, erroneous source data, approved changes, legislative changes, beyond-band fluctuations); Article 3.3.3 lists contractor risks (preliminaries lists, total-price BOQ defects, own technical/management risks, within-band fluctuations). Quantified triggers: quantity change 15% (8.9.1/8.9.2); price fluctuation 5% or the contract-agreed band (8.7.2/8.7.6).
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Order of applicable bases for material price adjustment: contract agreement prevails, pricing standard as fallback (GB/T 50500-2024 "agreement governs" and the 5% band rule)
Material price adjustment follows the contract agreement first (agreement governs, clause 1.0.3): adjustable material scope, base price, risk band, quantity calculation, price-information source and adjustment period all follow the contract, completing appendix G table G.2.1 as a contract annex; where the contract fixes no band or unclearly, fluctuation beyond 5% may be adjusted per appendix A (clause 8.7.2 fallback); the contract may neither violate mandatory laws and regulations nor depart from the substantive content of the tender documents (law prevails; clause 3.4.4); the price difference carries VAT only, no management fee or profit.
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Calculation of progress payments (GB/T 50500-2024 §9.1/§9.4): the cumulative-difference method, the 11-item composition of cumulative completed value, and payment/deduction rules
Current payable progress payment = cumulative completed value to date − cumulative paid price − current deductions (GB/T 50500-2024 Clauses 9.1.6, 9.4.9); absent an agreed ratio, payment should be no less than 80% of cumulative completed value (9.1.7); the cumulative value comprises 11 items — contract BOQ price, BOQ errors/omissions adjustments, provisional sums, adjustments of provisional prices after procurement, main contractor's attendance and coordination provisions, dayworks, changes in costs, regulation/policy changes, variations, additional works, claims; the statutory safety provisions advance may not be recovered from progress payments (9.1.7, 9.3.2), advances recovered per the agreement (9.2.6); disputed items certified and paid first on undisputed parts (9.4.11); payment applications must list construction workers' wages separately (9.4.9).
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Methods and liability basis for ensuring completeness of the bill of preliminaries at construction main (general) contracting tender stage (GB/T 50500-2024)
Per GB/T 50500-2024 clause 6.1.5, whether a re-measurable (unit-rate) or lump-sum contract is used, the completeness and accuracy of the bill of preliminaries are the bidder's (contractor's) responsibility, and the bidder bears the risk of the reasonableness of its tender price; preliminary items not priced as required may be deemed included in the all-in unit rates, totals and tender total of other billed (BOQ) items, with no re-pricing or adjustment at construction payment settlement (3.5.4). The contractor should guard against omissions via the six-category 'including but not limited to' framework in 3.2.6 + three cross-checks (bill of preliminaries vs project execution plan (construction methodology and site organization)/tender documents/similar projects) + site inspection + written clarification; statutory safety provisions are non-competitive (3.2.5) and must not be omitted or priced at zero.
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GB/T 50500-2024 pricing and settlement adjustment of main contractor's attendance and coordination provisions: per-item risk-inclusive pricing, percentage-rate based adjustment, interim settlement by construction stage, and recomputation at final account
Where the fee is priced per item, it is risk-inclusive except for deductions or adjustments under Clauses 8.4.8, 8.5.1-8.5.3 and 8.5.5, and shall not be adjusted at final account; where percentage-rate based and the contract is silent or unclear on the pricing basis, adjust per those clauses and compute at settlement from the contract prices of specialist subcontract works, of directly-let specialist works, and of employer-supplied (free-issue) material supply contracts; interim settlement by construction stage takes each specialist subcontract's cumulative completed price as a proportion of its contract price, multiplied by the adjusted total of the provisions; the final account shall recompute the whole of the provisions per Section 8.5 — amounts listed in stage settlements during construction are not a basis for the final account.
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GB 50500-2013 -> GB/T 50500-2024: changes to the clauses on statutory levies and fees, taxes and the mandatory health, safety and environmental (HSE) provisions — mandatory provisions withdrawn, the bills restructured into four parts, and the item renamed statutory safety provisions
2013 Clause 3.1.6, “statutory levies and fees and taxes must be calculated in accordance with the provisions of the state, provincial or industry construction authorities and shall not be treated as competitive costs” (a mandatory provision), disappears entirely from GB/T 50500-2024: the 2024 edition is a recommended GB/T standard with no mandatory provisions anywhere; under Clause 3.1.2 the bills become four parts (work items / preliminaries / provisional sums and other charges / VAT), statutory levies and fees are no longer a separate billed item, and taxes are renamed VAT (Clause 3.2.11: the tax base is the total of work items + preliminaries + other items, less the provisional sum for nominated specialist subcontract works, multiplied by the tax rate). The mandatory health, safety and environmental (HSE) provisions are renamed “statutory safety provisions” (Clause 3.2.5), and their “non-competitive” character is expressly retained (“is a non-competitive item”), but the wording is softened from “must ... shall not be treated as competitive costs” to “shall be priced in accordance with the relevant provisions of the state and provincial or industry authorities”. GB/T 50500-2024 takes effect on 1 September 2025, and GB 50500-2013 is repealed at the same time.
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Whether actual purchase quantities can directly serve as the material adjustment quantity: triple filtering of contract agreement + employer confirmation + not exceeding rational consumption (GB/T 50500-2024)
The purchase quantity cannot directly serve as the adjustment quantity Q; it must pass triple filtering: (1) the contract/special clauses expressly agree the purchase-quantity caliber (A.2.1, Note 2 of Table G.2.1-1); (2) submission to the employer for verification and confirmation before purchase, deemed accepted upon overdue silence, batch purchases averaged by weight (A.2.5); (3) capped by the rational consumption of works completed in the period — the excess is borne by the contractor per 3.6.3, and the appraisal caliber is "actual consumption = requisition quantity − inventory" (T/ZBD 100.4-2023 Clause 4.5.7). Safest: currently measured quantities × quota consumption (including loss).
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The FIDIC Performance Certificate (Red Book Clauses 11.9/11.10) mapped against the domestic completion acceptance - defect liability period - final settlement system: correspondences and differences
Performance Certificate is not Performance Bond. FIDIC Red Book 11.9: the Engineer issues the Performance Certificate within 28 days after the latest DNP expiry - "Only the Performance Certificate shall be deemed to constitute acceptance of the Works"; the 2017 edition adds deemed issue (a further 28 days after the due date); 11.10 keeps unperformed obligations alive after issue. The domestic system has no single counterpart: the function is shared by completion acceptance (taking over of the works), the defect liability period (generally 1 year, max 2, Jianzhi [2017] No. 138 Article 2), final settlement (GB/T 50500-2024 10.5.5/10.5.8 - silence deemed consent and deemed issuance of the payment certificate), and retention return (cap 3% of the settlement total, no interest). Biggest difference: after the FIDIC certificate the contractor is essentially discharged from defect duties; domestically, DNP expiry only releases the retention - statutory warranty duties persist.
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Cross-month material price adjustment: adjustment-period division and three methods for synthesizing multiple prices within a period (arithmetic mean / weighted mean with completed quantities / price of the main-consumption construction period)
Cross-month construction is not computed in a lump: adjust independently per the contractually agreed adjustment period (usually the measurement period, e.g., monthly) (8.7.1); where multiple market prices occur within one period, choose one of three per the symmetric provisions of Appendix A.2.3 (information method) / A.1.5 (index method) — arithmetic mean, weighted mean with completed quantities, or the price of the main-consumption construction period, with the weighted mean closest to actual cost; the three methods differ significantly, and the method and priority order must be agreed in the contract. Supporting: provisionally adjust per the published price information and correct later per actuals (A.2.2); the synthesized price and the base price C0 are compared symmetrically in the same caliber (A.2.1); price-taking under delays follows the responsible direction (8.7.4); the price difference carries VAT only, without management fee or profit (3.3.5).
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Line items and order of the final account price (the 13 items of GB/T 50500-2024, Clause 10.3.2)
Final account documents list 13 items in order: contract BOQ total -> errors and omissions in the BOQ adjustment -> provisional sums adjustment -> adjustment of provisional prices after procurement (materials + nominated specialist subcontract works) -> main contractor's attendance and coordination provisions adjustment -> dayworks adjustment -> changes in costs adjustment -> laws, regulations and policy changes adjustment -> variations -> additional works -> claim amounts -> penalties -> other amounts; this both standardizes final account compilation and supports cost-indicator statistics and cost estimation for similar works.
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Definition, classification hierarchy, and bases for handling the final account for construction works (GB/T 50500-2024)
The final account is the total-price settlement handled by the employer and contractor in accordance with the contract after the works pass taking-over (completion acceptance), and is the aggregation of interim settlements by construction stage (China's 2020-introduced staged settlement system, with no exact international equivalent); it is composed level by level from unit works -> single works -> project final account. Unless otherwise agreed in the contract, the amounts in the interim settlement by construction stage shall serve as the basis for the final account; the basis for settlement comprises five categories — contract documents; as-built drawings and variation documents; technical data and material-substitution approvals; pricing documents and bills of quantities (BOQs); and mutually confirmed site instructions / variation records and claim documents.
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Rules for determining the quantity (Q) of materials subject to price adjustment: contractual agreement takes precedence, and key points on matching the quantity basis and the period (GB/T 50500-2024)
There is no unified statutory formula for the adjustable-factor quantity Q; it is determined by the calculation method agreed by the employer and contractor in the contract (Appendix A.2.1 + Note 2 of Table G.2.1-1), and must be detailed and clarified in the tender documents / contract special clauses. In practice, the most common basis is "quantities measured for the current period x material consumption under quota norms (prescribed resource consumption standards)/mix ratio (including wastage)", or the purchase quantities confirmed by the employer (A.2.5). Q must correspond to the basis of the price adjustment period and to the price Ci for the measurement period; where the contract is silent, the standard provides no fallback determination and disputes easily arise.
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Appendix D “Pricing Statements” of GB/T 50500-2024: required contents of the four statement tables and dispute risks of omissions (tender price ceiling / tender (priced offer) / final account statement + method of measurement statement for the bill of quantities (BOQ))
GB/T 50500-2024 Appendix D has four statement tables: D.1.1 tender price ceiling preparation (review) statement must include project overview, scope, basis of preparation (review), special requirements (if any), and other issues to be explained; D.2.1 tender (priced offer) statement must include scope, item description (work item specification), planned duration, site conditions, project execution plan (construction methodology and site organization) features, and other issues to be explained; D.3.1 final account (interim) preparation (review) statement must include project overview, scope, basis of preparation (review), and other issues; D.4.1 statement of method of measurement for the BOQ must specify the names and numbers of the national/industry measurement standards adopted and list supplementary rules of measurement (with 4.1.3). Omitting basis details, scope delimitation, supplementary rules of measurement, and explanations of price and percentage rate determination (GB/T 51095-2015 8.2.3) are high-frequency final account dispute triggers.
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Old-vs-new rules on the advance payment ratio: GB/T 50500-2024 Clauses 9.2.2/9.2.3 vs GB 50500-2013 Clause 10.1.2 — the 10%–30% band and changed deduction bases
The 10%–30% payment band is retained in GB/T 50500-2024 but the deduction bases changed: the lower-bound base now deducts the provisional sum for nominated specialist subcontract works in addition to provisional sums; the upper-bound base is now 30% of the signed contract price with no deductions; the basis for computing the advance expressly deducts three items (provisional sums, dayworks amounts and the provisional sum for nominated specialist subcontract works); the lower-bound wording softens from "shall not be below" to "should preferably not be below" (the standard as a whole becoming a recommended national standard). Advances for major multi-year works are paid annually against the annual programme, with each year preferably not below 10% and not above 30% of that year's planned contract price for completion (excluding provisional sums and the provisional sum for nominated specialist subcontract works) (9.2.3).
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No price adjustment for BOQ defects in lump-sum contracts (BOQ quantities below drawings): the four-layer rule of GB/T 50500-2024 and the reversal of the 2013 edition's Clause 8.3.1 measure-and-value rule
Under GB/T 50500-2024 (effective 2025-09-01; GB 50500-2013 simultaneously repealed), BOQ quantities in lump-sum contracts below the drawings constitute a "BOQ defect" and are not adjusted during performance: 2.0.7 bars using changes in BOQ items/quantities as an adjustment basis; 3.4.6 deems defect prices included in the lump sum with contract drawings and specifications governing; 4.1.6 disallows adjustment for defect-induced price changes; 7.2.2 allows no re-measurement of the BOQ; 7.4.1 defines drawing-vs-BOQ differences as defects not adjustable. The 2013 Clause 8.3.1 (an ordinary clause, not among that edition's 15 mandatory ones) allowing measure-and-value for BOQ-tendered lump-sum contracts has been deleted and reversed. Only two openings remain: (1) items marked "provisional quantities" re-measured per unit-price rules (4.1.6, 7.2.2 item 2); (2) differences between contract drawings and as-built drawings are variations measured under 7.4.3 (7.2.2 item 3) - unchanged drawings with undercounted BOQs are no variation.
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Definition and cost composition of the all-in unit rate (GB/T 50500-2024 Clause 2.0.9, GB/T 50875-2013 Clause 2.2.58)
All-in unit rate = labour cost + material cost (including engineering equipment) + plant and small tools cost + overheads (company and site) + profit + risk cost within the agreed scope and range, required to complete one specified unit of measurement of a billed (BOQ) item; VAT is excluded (a price-exclusive tax). Basis: GB/T 50500-2024 Clause 2.0.9 and GB/T 50875-2013 Clause 2.2.58; building works BOQ-based pricing uses the "incomplete-cost" caliber excluding statutory levies and fees and taxes, while highways and other industries may use the fully loaded caliber including statutory levies and fees and taxes — confirm the applicable industry standard before citing.
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Nature and pricing rules of statutory safety provisions (GB/T 50500-2024: non-competitive item, whole-process constraints, and the change in normative force)
GB/T 50500-2024 Clause 3.2.5 states that the statutory safety provisions in the bill of preliminaries "shall be priced per the relevant provisions of the state, provincial, and industry authorities" and "are a non-competitive item" — their standard is not formed by market competition. Clause 2.0.4 defines them as the special fee safeguarding construction production safety; Clauses 5.2.5/6.2.6/9.3.1/9.3.4 enforce "compliance with authority provisions + ring-fenced (earmarked) use of funds, no diversion" across the tender price ceiling, tenders, and interim payments. The old GB 50500-2013 Clause 4.1.5 (mandatory provisions of codes: "must... shall not be a competitive fee") lost its mandatory force when the standard changed to a recommended GB/T; current binding force rests on administrative documents of the authorities and tendering supervision practice.
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Interim settlement by construction stage (stage settlement) in GB/T 50500-2024 (Section 10.2): node agreements, procedure flow, price calculation, and differences from the one-off final account under GB 50500-2013
GB/T 50500-2024 first establishes "interim settlement by construction stage" as a formal system (Section 10.2): settlement nodes (monthly/quarterly/annual/physical progress) and procedures are agreed in the contract (10.1.3); stage-settlement documents signed and confirmed by both parties merge into the final account without re-measurement or re-pricing (10.2.3), except the preliminaries and the main contractor's attendance and coordination provisions (provisionally paid, accurately re-measured at the final account). The 2013 edition had only "interim progress payments + a one-off final account after completion", and the standard itself laid down fixed periods (28-day verification / 28-day review / 7-day signature / 7+14-day payment, 11.3.2-11.4.4); the 2024 edition leaves all periods to contractual "agreed times" while retaining and extending the "deemed approval upon lapse of the response period" mechanism. Substantive change: settlement shifts from "determined once after completion" to "locked in stages as construction advances, summarized at the final account".
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Order of application of pricing bases for the final account: contract agreement first (agreed terms prevail); quota norms and construction cost management agency's pricing bases as fallback
Final account prices take the contract as the fundamental basis: pricing activities follow "statutory priority, agreed terms prevail" (GB/T 50500-2024 Clause 1.0.3) — where the contract provides for price determination, adjustment methods, and quantity calculation rules, the agreed terms prevail; only absent or unclear agreement are national, industry, and local pricing bases (including quota norms) referenced (T/ZBD 100.5-2023 Clause 1.4.2). In construction cost expert assessment (judicial appraisal) of price disputes, the fallback order is fair market price → pricing quota norms → cost data + on-cost level (T/ZBD 100.4-2023 Clause 3.1.6).
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FIDIC Red Book 2017 Variations vs China's variation/new-works regime (13.1 vs GB/T 50500-2024 2.0.28/2.0.30, 8.1.1 and T/ZBD 100.4-2023 4.6.1)
The two share one origin and structure: GB/T 50500-2024 term 2.0.28 "variation of works" - additions, deletions, cancellations, substitutions - maps item-by-item onto FIDIC 2017 Red Book 13.1's six variation cases (quality/characteristics, position/dimensions, omissions, necessary additional work for the Permanent Works, sequence/time); the omission safeguard "except work transferred to others" matches T/ZBD 100.4-2023 4.6.1's five appraisal situations. The biggest divergence: China lists physical works outside the contract scope separately as "new works (extra work)" (term 2.0.30), parallel to variations as two adjustment channels in 8.1.1, preventing unlimited scope expansion by variation orders; the FIDIC Red Book has no standalone "new works" - additional work necessary for the Permanent Workers folds directly into the variation procedure. Initiation and validity: FIDIC variations are Engineer-initiated and the contractor may not alter the Works; the Chinese definition makes employer approval the validity element.
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Advance payment rules for the statutory safety provisions (mandatory health, safety and environmental (HSE) provisions) compared: GB 50500-2013 Clause 10.2.2's 60% vs GB/T 50500-2024 Clause 9.3.2's 50%, no recovery from progress payments, one-time recovery at final account
The advance percentage for the mandatory health, safety and environmental (HSE) provisions (renamed "statutory safety provisions" in the 2024 standard) has dropped from 60% to 50%: GB 50500-2013 (repealed) Clause 10.2.2 required an advance of not less than 60% of the current year's planned total within 28 days of commencement; GB/T 50500-2024 (current) Clause 9.3.2 changes this to not less than 50% of the total and adds the explicit recovery rule that "the advance for the statutory safety provisions shall not be recovered when computing progress payments due and shall be recovered in one lump sum at final account". The advance window (within 28 days of commencement) is unchanged.
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Risk allocation for incomplete item descriptions in the BOQ (BOQ errors and omissions): employer responsible under re-measurable (unit-rate) contracts, contractor responsible under lump-sum contracts, contractor always responsible for the bill of preliminaries
Per GB/T 50500—2024, an incomplete item description is an "error or omission in the BOQ": under re-measurable (unit-rate) contracts the employer (tenderee) is responsible for the completeness of billed items, the accuracy of item descriptions and the accuracy of quantities, and at settlement the all-in unit rate is re-rated on the basis of the characteristics actually constructed to adjust the contract price; under lump-sum contracts the contractor is responsible and no adjustment is made except for provisional quantities; for the bill of preliminaries, the contractor is responsible under both re-measurable and lump-sum contracts.
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Prepayment and payment rules for statutory safety provisions (GB/T 50500-2024 Clauses 9.3.2, 9.3.3): not less than 50% prepaid within 28 days of commencement, paid alongside progress payments, recovered in one lump sum at final account
Under Clause 9.3.2 of GB/T 50500-2024, the China national pricing standard for BOQ, the employer shall, within 28 days after commencement, prepay to the contractor not less than 50% of the total statutory safety provisions; the remainder shall be broken down on the "arrange in advance" principle and paid alongside progress payments; for multi-year major works the prepaid total may be broken down by reference to the annual programme of works. When computing progress payments due, the prepaid safety provisions shall not be recovered; they are recovered in one lump sum at final account. Clause 9.3.3: where the employer fails to pay by the agreed time, the contractor may give notice; if payment is still not made within the agreed period after such notice, the contractor is entitled to suspend the works and the employer bears liability for breach of contract; where a safety accident occurs because the employer failed to pay the statutory safety provisions on time, the employer bears the corresponding responsibility.
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The legal function of the "experienced Contractor" standard in the FIDIC Red/Yellow/Silver books: the foreseeable/unforeseeable risk boundary and the three books' mechanism differences
"Experienced Contractor" is not an all-risk disclaimer label but the yardstick drawing the foreseeable/unforeseeable line, binding both sides: Red/Yellow allocate risks by "whether reasonably foreseeable by an experienced Contractor at the tender deadline" (foreseeable to the Contractor, unforeseeable to the Employer); the Silver Book, via 4.12, makes the Contractor "accept total responsibility for having foreseen all difficulties and costs" with no price adjustment for any unforeseeable difficulties — transferring nearly all financial risk, though delay relief remains limited to the listed 8.5 cases and Employer's risks 17.2 remain.
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Can published price information directly serve as the basis for material price adjustment: legality + three preconditions (listing / beyond band / tax) (GB/T 50500-2024)
Published price information (government guidance prices) is a price source expressly recognized for price adjustment (for fluctuation) (Appendix A.2.1: both the base price C0 and the measurement-period price Ci may adopt the current published price information issued by the cost management agency; A.2.4: where published price information serves as both base price and current price, adjust within the agreed risk band), but adjustment is not unconditional and full-scope: (1) the material must be listed in the contract annex "schedule of price-adjustable key materials" (Table G.2.1-1; not listed, not adjusted); (2) only the portion beyond the contract-agreed risk band is adjusted to actual, the band being contractor-borne; (3) where the contract sets no band, fluctuation beyond 5% is the fallback trigger (8.7.2). The price difference carries value added tax (VAT) only, not management fee or profit (3.3.5).
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Determining the drawing basis for the final account: as-built drawings govern (as-built drawings + variation/site instruction records jointly verify the work actually completed), with construction drawings serving as the benchmark for contract-scope definition and variation-difference comparison
The final account is based on the as-built drawings — more fully stated: the qualified work actually completed is verified by 'as-built drawings + design changes, variations, site instructions / variation records and other variation documents'. GB/T 50326-2017 Clause 18.3.3 lists 'as-built drawings and variation documents' as bases for the final account without separately listing construction drawings; JGJ/T 185-2009 Clause 4.2.4 provides that absent changes, construction drawings stamped as as-built become the as-built drawings (the two being equivalent), and where changes exist, the changed content must be redrawn into the as-built drawings; the construction (contract) drawings recede in the final account to the benchmark defining the contract scope and comparing variation differences (GB/T 50500-2024 Clause 7.4.1).
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Liability for errors or omissions in the tender BOQ: GB 50500-2013 vs GB/T 50500-2024 (2013 Clause 4.1.2 mandatory provision vs 2024 Clause 3.1.8 split by unit-rate/lump-sum contract)
GB 50500-2013, Clause 4.1.2 (mandatory provision): 'the tender BOQ must form part of the tender documents, and its accuracy and completeness shall be the tenderer's responsibility.' GB/T 50500-2024, Clause 3.1.8, instead splits liability by the contract pricing method: for unit-rate contracts, the accuracy and completeness of the divisional and elemental BOQ rest with the employer (tenderer) - bidders may not alter it on their own, defects adjust the price per Section 8.2, with a 15% quantity change as the threshold; for lump-sum contracts they rest with the contractor, who may supplement the list, and per 8.2.3 the contract price and time are not adjusted for BOQ defects (except unit-priced items with provisional quantities); the item-priced measure list is in all cases the contractor's responsibility. The 2024 edition was approved by MOHURD Announcement No. 212 of 2024, is effective from 1 September 2025 with GB 50500-2013 repealed simultaneously, and changed from a mandatory (GB) to a recommendatory (GB/T) national standard.
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GB/T 50500-2024 charging scope of the main contractor's attendance and coordination provisions: charged on free-issue materials and the employer's specialist subcontracts, not on the contractor's own subcontracting
Per GB/T 50500-2024, free-issue materials (materials provided by the employer) and the employer's specialist subcontracts (those within the contract other than what the contractor itself performs, and those directly awarded outside the contract) both attract the main contractor's attendance and coordination provisions; the contractor's own specialist and labour subcontracting does not. The percentage rate is subject to the current norms for on-costs and expenses of the project location.
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Overview of bills of quantities: composition, compilation, item descriptions and handling of errors/omissions (GB/T 50500-2024)
A bill of quantities comprises four sections — trade items, preliminaries, other items and VAT; the five BOQ elements (code/name/item description/unit of measurement/quantity) are compiled per the national and industry measurement standards. Division of responsibility: under unit-rate contracts the trade-items BOQ is the employer's responsibility, under lump-sum contracts the contractor's, and the bill of preliminaries is always the contractor's. BOQ defects are per definition 2.0.27; unit-rate contracts re-measure under section 8.2 with price adjustment at the 15% boundary; lump-sum contracts are generally not adjusted except provisional-quantity items.
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Maximum bid price (former tender price ceiling) compilation framework and cost composition under GB/T 50500-2024
State-funded projects must set a maximum bid price (the former tender price ceiling), compiled and reviewed by the tenderer or a commissioned cost consultant, published in detail with the tender documents, and not to be raised or discounted; compilation basis: the seven items of GB/T 50500-2024, Clause 5.2.1. Cost composition: divisional and elemental work costs (pre-tax fully loaded all-in unit rate, including risk costs and auxiliary work costs) plus preliminaries (statutory safety provisions, non-competitive) plus other-item costs (provisional sums, provisional prices, dayworks, general contractor's service fee, etc.) plus taxes (VAT listed separately). Note the 2024 edition abolishes the separate line item for statutory fees, absorbing them into the all-in unit rate - different from the 2013 edition and some local documents; confirm the applicable edition before compiling.
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Legal consequence chain when the employer fails to check the final account or pay on time: GB/T 50500-2024 cl. 10.3.8/10.3.16/10.3.17/10.5.8/10.5.9 “deemed acceptance + liability for breach of contract” and the 28-day fallback
The consequences of the employer failing to check the final account on time progress in four layers: (1) no checking or no comments within the agreed time -> the contractor's final account documents are deemed accepted and the final account is confirmed (GB/T 50500-2024 cl. 10.3.8); (2) failure to verify the payment application or to issue the final account payment certificate -> the payment application is deemed accepted and the final account money must be paid per the amount stated in the application (cl. 10.3.16); (3) still no payment -> the contractor may give notice requiring payment and may claim per cl. 8.11.9 (cl. 10.3.17); (4) at the final closure of accounts after the defects liability period terminates, overdue checking without comments on modification -> deemed consent to the final closure application and deemed issuance of the final closure payment certificate, with liability for late payment per the contract or per laws and regulations (cl. 10.5.8, 10.5.9). Where no period is agreed, the 28-day fallback applies (former MOC Order No. 107 art. 16, carried on by current MOHURD Order No. 16 art. 18); judicial enforcement presupposes a contractual “deemed acceptance” clause (Fa Shi [2020] No. 25 art. 21).