Priority order when methods of measurement of different disciplines/versions conflict: contractual agreement -> national standard for measurement of the works matching the contract category -> industry/local standard -> fallback chain for version disputes

Topic Positioning

This card resolves 'which set of methods of measurement applies when methods of measurement of different disciplines or versions conflict': the complete priority order from contractual agreement, national standards for measurement of the works, and industry/local standards down to the version-dispute fallback chain, covering preparation of the bill of quantities, final account review, and construction cost expert assessment (judicial appraisal).

Core Conclusions

The priority order proceeds level by level; once a level yields a definite result, go no further: (1) Contractual agreement takes precedence: where the contract explicitly agrees the method of measurement (including version), follow the agreement. GB/T 51262-2017 'Code for construction cost expert assessment (judicial appraisal)' Clause 5.5.1: where the project under assessment's drawings are complete and the parties dispute the measurement basis, the expert assessor shall measure using the method of measurement specified in the current national standards for measurement of the works; where there is no national standard, use the current industry or local standard — unless the parties have agreed a method of measurement in the contract. T/ZBD 100.4-2023 Clause 4.3.1 has the same position: where the parties have explicitly agreed methods of measurement in the contract, the expert assessor shall measure per the agreed methods of measurement.

(2) The current national standard for measurement of the works consistent with the contract category: Clause 4.3.1 — where no methods are agreed, the expert assessor shall measure per the corresponding national standard for measurement of the works consistent with the contract category; where the national standard does not provide, use the current industry or local standard's methods of measurement. 'Consistent with the contract category' means first determining the contract category, then the standard — e.g., for gross floor area (GFA) disputes: construction contracts apply GB/T 50353 'Code for calculation of gross floor area (GFA)', real-estate sale contracts apply GB/T 17986 'Specification for real estate surveying'.

(3) With multiple disciplines coexisting, attribute each billed (BOQ) item by the first two digits of its code: 01 building construction and decoration, 02 historic-style buildings, 03 general installation, 04 municipal, 05 landscaping, 06 mining, 07 structures, 08 urban rail transit, 09 blasting. After attribution, measurement must follow that discipline's standard appendix rules — GB 50861-2013 Clause 4.2.5 (mandatory provision of codes): the quantities listed in the BOQ shall be calculated per the method of measurement specified in the appendix; other disciplines' methods of measurement must not be mixed in.

(4) Version-dispute fallback chain (T/ZBD 100.4-2023 Clause 4.3.2): where the contract agrees a version of the methods of measurement, follow it; where not agreed or inconsistent, use the methods of measurement explicit in the document that prevails under the contract interpretation order; where no contract document allows judgment, re-measurable (unit-rate) contracts successively use the BOQ issued by the party inviting tenders and the method of measurement used in preparing the tender price ceiling (quantities are the responsibility of the party inviting tenders), and lump-sum contracts use the method of measurement used in the tenderer's tender price (quantities are the tenderer's responsibility); if still undeterminable, the expert assessor measures per the client's request or their own professional judgment with necessary explanation.

Applicable Boundaries

Applies to measurement-basis disputes in measurement during construction contracting and implementation, preparation of the bill of quantities, final account review, and construction cost expert assessment (judicial appraisal). In the BOQ-based pricing stage follow each discipline's measurement standard appendix; in the estimate/budget or quota norms pricing stage follow the method of measurement specified in the quota norms used. BOQ quantities (net dimensions) and quota norm quantities are different measurement bases — never mix them; this card only resolves 'which set of methods of measurement to choose'; the specific algorithms within the chosen standard (deduction thresholds, slope coefficients, etc.) still follow the selected standard's appendix. With coexisting versions, note the differences between the 2013 measurement codes (GB 50854-50862-2013) and the 2024 measurement standards (GB/T 50854/50856/50857/50860/50861-2024 etc.); the contract-agreed version governs, and the 'current edition' is not the default.

Further Reading

GB/T 51262-2017 'Code for construction cost expert assessment (judicial appraisal)' Clause 5.5.1 (priority order for measurement-basis disputes); T/ZBD 100.4-2023 'Working guideline for construction cost expert assessment (judicial appraisal)' Clause 4.3.1 (contractual agreement takes precedence; contract-category determination) and Clause 4.3.2 (full chain for version disputes over methods of measurement); GB 50861-2013 'Code for measurement of urban rail transit works' Clause 4.2.5 (mandatory provision of codes; BOQ quantities per the method of measurement in the appendix); the GB/T 50854-50862 series per the first two code digits; quota norms pricing basis: DL/T 5465-2013 Clause 4.1.13, DL/T 5468-2013 Clause 4.1.11.