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Priority of Contract Documents — Resolving Conflicts

A construction contract is not a single document but a stack of them — conditions, specification, drawings, bills, programme, addenda. Each prepared at a different time, by a different hand, for a different purpose. When they conflict, which one governs?

4 min read · Updated 21/04/2026

In this article

1. Why contract documents conflict in practice
2. The express priority clause — FIDIC 1.5 as an example
3. Where no priority clause exists
4. Practical application before and during execution
5. Risks and mitigation
6. Conclusion

Key takeaway

Most standard form construction contracts contain an express priority clause that resolves conflicts between documents. FIDIC Red Book 1999 does so at Clause 1.5. Where no priority clause exists, tribunals apply two presumptions: the more specific overrides the more general, and the later overrides the earlier. Both are rebuttable. The priority order should be understood before the contract is signed — not argued about after a dispute.

1. Why contract documents conflict in practice

Conflicts between contract documents are among the most common triggers of UAE construction disputes — and among the most avoidable. A specification that requires one material alongside a drawing that shows another creates a genuine question about what the contractor is obliged to provide and what it is entitled to be paid for. Where the answer differs significantly from the contractor’s pricing assumptions, a claim arises.

The common sources of conflict in practice include: drawings and specification updated after bills of quantities were prepared; employer’s special conditions conflicting with standard form general conditions; preambles to bills of quantities that expand or restrict the scope of works described in individual bill items; and addenda issued during the tender period that were not incorporated consistently across all documents before award.

2. The express priority clause — FIDIC 1.5 as an example

The most straightforward resolution is an express priority clause — a provision that specifies which document prevails in the event of conflict. Standard form contracts typically include such clauses.

The commercial significance of the priority order is often overlooked. A priority order that places the specification above the bills of quantities — as FIDIC does — means the scope obligation (defined in the specification) prevails over the pricing basis (the bills). Where a specification requires work not priced in the bills, the contractor must perform it — recovery for the additional cost then depends on whether the omission qualifies as a variation or a discrepancy entitling adjustment.

3. Where no priority clause exists

Where no priority clause exists, or where the conflict falls outside its scope, tribunals apply two presumptions. The more specific provision overrides the more general — a detailed specification item will prevail over a general description. And the later document overrides the earlier — an addendum issued shortly before tender return will typically prevail over an earlier drawing. Both presumptions are rebuttable, and tribunals will take the commercial context into account when deciding which reading to prefer.

4. Practical application before and during execution

Before executing the contract, review the priority clause carefully and consider whether the ordering reflects the risk allocation actually intended. Any discrepancies between the specification and the bills that emerge before execution should be resolved expressly through clarifications or addenda.

During construction, when a conflict is identified, do not simply proceed on the basis of the document that favours your position — notify the Engineer or contract administrator and seek a formal instruction. This ensures the conflict is on record and any additional cost or time is captured in the appropriate claims process. A claim built on a document-priority argument is substantially stronger when it is underpinned by a contemporaneous formal instruction.

5. Risks and mitigation

The risk of an unresolved document conflict is that the contractor prices work on one basis (the bills) but is obliged to perform on another (the specification), without a clear mechanism for recovering the difference. Alternatively, the contractor performs to the lower standard described in the bills and is then required to re-execute to meet the specification standard, with uncertain recovery prospects.

Mitigation is a thorough document review before executing the contract, with all conflicts resolved by express agreement or amendment. During the project, maintain a conflict register to track issues as they emerge and ensure that instructions on conflicts are properly documented against the relevant claims mechanism.

6. Conclusion

Document conflicts are preventable with rigorous pre-contract review. Where they arise despite best efforts, the priority clause provides the resolution mechanism — but its commercial implications must be understood before the contract is signed, not after a dispute arises and the priority order turns out to favour the other party.

Resolve the conflict before it resolves itself

Document-priority disputes are rarely pure interpretation — they turn on technical scope, pricing basis, and the sequence in which documents were issued. Early review avoids protracted argument at the tribunal stage.

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