Your drawings and specs disagree. Which one wins?

October 3, 2026

Contents

When drawings and specifications conflict, the contract’s order-of-precedence rules decide which document governs. You still need a written clarification before you build.

Tower cranes over a residential building under construction

Guessing, or quietly picking the cheaper or more convenient reading, is how a coordination issue turns into a change dispute, a rejected shop drawing or a forfeited claim. Resolve it in writing before anyone builds.

This is one of the most common roads to a dispute. Arcadis's 2026 US Construction Disputes Report ranks errors and omissions in the contract documents as the second leading cause of US construction disputes in 2025. The average dispute was worth US$56 million and took 12.2 months to resolve.

This article is for contract administrators, project managers and field supervisors working under Canadian CCDC-style stipulated-price forms and U.S. AIA A201-style general conditions, and the many owner-modified hybrids of both. It is practical guidance for document administration, not legal advice. Always read the Agreement, Supplementary Conditions and Division 01 on your project: those documents can rewrite the default rules below.

The short answer

When drawings and specifications conflict on a construction project, do not assume either document automatically wins. Under a typical CCDC 2 form, the Contract Documents follow a stated priority ladder: technical specifications and finishing schedules generally rank above drawings, later or amended documents supersede earlier ones of the same type, and written dimensions and annotations prevail over scaled graphics. Under a typical AIA A201 form, the Contract Documents are complementary and drawings and specifications often share equal authority; the architect’s interpretation of design intent resolves inconsistencies unless the Supplementary Conditions impose a different hierarchy.

In either system, stop, document the discrepancy and request clarification (an RFI or request for interpretation). If the answer changes cost or time, preserve your rights with the contract’s claim or notice procedure, and check the governing form for exact timing. An RFI alone is not a claim.

Specs say one thing, drawings say another: who wins?

Short answer: whoever the Contract Documents say wins, after you apply the conflict rules in the Agreement, General Conditions and Supplementary Conditions. Not jobsite folklore.

CCDC 2 (Canada): a priority ladder when there is a conflict

CCDC 2-style General Conditions typically treat the Contract Documents as a set that must be read together, and they provide an explicit order of priority if there is a conflict. In paraphrase (exact wording and edition matter, so check your signed form):

Agreement between Owner and Contractor
Definitions
Supplementary Conditions
General Conditions
Division 01 of the Specifications
Technical Specifications
Material and finishing schedules
Drawings

Interpretation rules that often travel with that ladder:

Larger-scale drawings govern smaller-scale drawings of the same date.
Dimensions shown on drawings govern dimensions scaled from drawings.
Amended or later-dated documents govern earlier documents of the same type.
Noted materials and annotations govern graphic indications.

Practical takeaway for Canadian work: in a true conflict under a stock CCDC 2 form, written technical specs and schedules usually outrank the drawings. That does not make every drawing note “just a drawing”: notes and annotations on sheets are often treated as written direction. Nor does it let you ignore an addendum or a Change Order that moved the goalposts after bid.

AIA A201 (United States): complementary documents, the architect interprets

AIA A201-style General Conditions typically emphasize that the Contract Documents are complementary: what is required by one is as binding as if required by all. Stock A201 generally does not create a fixed “specs beat drawings” hierarchy. When inconsistencies appear, the architect’s interpretation, aimed at design intent, is the usual administrative path, subject to the claim procedures if cost or time is affected.

Owners often add Supplementary Conditions that do impose a priority sequence. AIA guidance has historically cautioned against a rigid drawings-versus-specs hierarchy; where a priority list is insisted upon, model language often keeps drawings and the technical specification divisions at the same tier and still leaves unresolved clashes to the architect. Many private owners ignore that caution and write “specifications govern drawings” (or the reverse). Read the Supplementary Conditions.

Practical takeaway for U.S. work: do not assume CCDC habits apply on an A201 job, and do not assume A201 “equal authority” applies on a heavily modified public or institutional form. The signed package controls.

Hybrid and owner forms

Institutional, IPD-adjacent, CM-at-risk and public-owner packages frequently mix CCDC and AIA DNA with local statutes, Division 01 RFI rules and “greater quantity or higher quality prevails” clauses. Those overlays can override both of the approaches above. Treat them as full Contract Documents, not footnotes.

Order of precedence in construction contracts: how to read it correctly

Teams lose money by treating “order of precedence” as a slogan instead of a procedure. Use this method:

Confirm you actually have a conflict. An omission on one sheet that is fully specified elsewhere is often complementarity, not conflict. A conflict exists when two provisions cannot both be performed as written.
Identify the document class of each provision. Is the clash Agreement vs. General Conditions, Division 01 vs. a technical section, finish schedule vs. detail, addendum vs. issued-for-construction sheet, Change Order vs. original spec? Priority only works if you classify correctly.
Apply the later-dated and amended document rules. An addendum or modification that expressly revises a detail usually beats the superseded sheet, even if someone still has the old PDF open on a tablet.
Apply the scale, dimension and annotation rules where your form includes them (common in CCDC; often echoed in U.S. Division 01).
Only then decide which document governs, and get it confirmed in writing if the answer drives procurement, fabrication or sequencing.

Common trap: “specs always win” is incomplete even on CCDC jobs. Schedules sit above drawings in the usual ladder, but a later addendum that revises a drawing note can defeat an earlier schedule entry. Another trap on A201 jobs: treating an RFI reply as a free Change Order. Clarifying existing intent does not automatically change the Contract Sum or the Contract Time.

Three conflicts you will see on real jobs

1. Dimension callout vs. schedule note (door and opening package)

The architectural plan shows a clear opening width. The door schedule note (or a Division 08 schedule) implies a different leaf size or frame throat once hardware and seal criteria are applied. The fabricator works from the schedule; the installer cuts to the plan dimension. Result: rejected openings, remakes and a fight over whether the schedule outranked the plan under CCDC, or whether the architect’s interpretation should have been obtained under A201 before release to fabrication.

Admin lesson: hold fabrication on opening packages until dimensional conflicts are clarified in writing. Cite both document locations in the RFI.

2. Finish schedule vs. wall-type detail (wet area)

The room finish schedule calls for a waterproof membrane behind tile. The wall-type detail on the architectural sheets shows standard gypsum board at the wet-area partition, with no membrane hatching. The subcontractor prices the detail; the owner’s inspector later demands the finish-schedule system. Under a CCDC-style ladder, finishing schedules typically sit above drawings, which strengthens the owner’s and consultant’s position, but the contractor may still have notice, pricing and sequencing arguments if the conflict was latent and promptly flagged. Under A201’s complementary approach, the architect’s written interpretation still needs to come early; if it increases cost or time, the claim procedures apply.

Admin lesson: finish schedules are not optional colour charts. Treat schedule-vs-detail clashes as high risk before waterproofing or board goes in.

3. Addendum missed in the field set (mechanical clearance)

A bid addendum revises a reflected ceiling plan and raises a duct main. The working set in the trailer was never refreshed, and the mechanical shop drawings were coordinated to the pre-addendum architecture. The conflict surfaces when the ceiling sub starts layout. CCDC’s later-dated document rules and the priority AIA supplementary models give to Modifications and Addenda usually favour the addendum. The commercial outcome still depends on who had the duty to distribute, acknowledge and coordinate, and whether notices were timely.

Admin lesson: version control is a contract administration control, not an IT nicety. Log addendum acknowledgment against the field set and the BIM or PDF source of truth.

Working from the wrong version is a measurable cost. In the PlanGrid and FMI "Construction Disconnected" study, inaccurate, inaccessible or incompatible project data caused 48% of rework on US projects.

RFI vs. claim notice: clarification is not entitlement

An RFI (or request for interpretation) asks what the Contract Documents mean. A claim notice asserts that cost, time or another contractual entitlement is affected. They are related; they are not substitutes.

Both cost time and money. A 2013 Navigant review of 1,300 major projects counted an average of 796 RFIs per project, with a median response time of 9.7 days and an average cost of about US$1,080 each to review.

When an RFI is the right first move

Use an RFI when:

Two documents cannot both be built as written.
A detail is silent where another document speaks.
You need design intent confirmed before procurement or installation.
Shop drawing review has exposed a mismatch you cannot resolve by cross-reference alone.

Good RFIs cite exact sheet numbers, detail bubbles, specification sections, schedule line items and addendum numbers. They propose a recommended reading (optional but useful) and ask for confirmation. They do not argue entitlement in the first paragraph.

Under both CCDC and AIA administration, the consultant or architect typically issues an interpretation, supplemental instruction or similar instrument when the answer clarifies the existing documents without changing price or time. If the answer does change the Work, the path usually shifts to a Proposed Change, Change Order or Change Directive (CCDC) or the comparable modification instruments (AIA).

When you also need the claim and notice procedure

Follow the contract’s claim procedure if the clarification, instruction or resolution:

adds scope, quantity or performance level;
forces remobilization, re-fabrication or re-sequencing;
extends critical activities; or
contradicts a priced assumption that was reasonably based on the bid set.

That means the claims for a change in Contract Price or Contract Time provisions (CCDC) or the claims article (AIA A201 Article 15, as modified). Exact day counts, form of notice and who must be copied are specific to the form and the Supplementary Conditions, so check the governing contract and any prompt payment legislation in your province or state. Missing a notice window is a classic way to lose an otherwise sound position.

Field rule of thumb: the RFI opens the question; timely written notice preserves money and time; the Change Order or Change Directive closes the commercial loop. Doing the work “under protest” without the contract’s required notices is not a strategy. It is a gamble.

What to do, step by step, when drawings and specs conflict

Stop the affected work (or hold the procurement release) so you do not pour, fabricate or cover the wrong answer.
Capture the conflict with citations: document A location and excerpt, document B location and excerpt, plus photos or markups if field conditions are involved.
Classify the documents against your form’s priority or complementary rules (Agreement, Supplementary Conditions, General Conditions, Division 01, technical specs, schedules, drawings, addenda, Change Orders).
Check for later instruments: addenda, supplemental instructions, Change Orders, Change Directives, reviewed shop drawings with exceptions.
Issue a focused RFI or request for interpretation to the consultant or architect, through the contractual channel (CM, owner’s representative) if required.
Calendar the response and any notice deadlines from the governing General Conditions and Division 01. Do not work from a “standard” number of days you remember.
If the answer affects cost or time, issue the required claim or notice in parallel with pricing. Do not wait for the next payment application.
Build only to the written resolution (supplemental instruction, Change Order, Change Directive or the architect’s interpretation as your form formalizes it). Update the controlled document set and push the revision to subs and fabricators.
Record the trail for audit, lien and close-out: RFI number, response, related Change Order or Directive, schedule impact log.

This sequence works in both Canadian and U.S. practice because it puts interpretation first and entitlement second, the order most standard forms expect.

Clause references to cite in your logs

When you annotate RFIs, meeting minutes and claim letters, cite the provision at section level, then quote your signed text. Where to look, by topic:

Conflict and priority among Contract Documents. CCDC 2: the General Conditions on Contract Documents and their priority ladder. AIA A201: complementary documents, the architect’s interpretation and any priority clause added in the Supplementary Conditions.
Drawings vs. specifications. CCDC 2: specs and schedules sit above drawings in the conflict ladder. AIA A201: often equal authority unless modified.
Larger scale, figured dimensions, annotations. CCDC 2: explicit interpretation rules in the General Conditions. AIA A201: often echoed in Division 01 or the owner’s Supplementary Conditions.
Consultant or architect interpretations. CCDC 2: administration of the Contract and the role of the Consultant. AIA A201: the architect’s administration and interpretations.
Changes when a clarification alters the Work. CCDC 2: changes in the Work and claims for a change in Contract Price. AIA A201: Modifications and the claims procedures.
Notice mechanics. CCDC 2: the Notice in Writing definitions and the claim provisions. AIA A201: written notice and the claims article, as modified.

Paraphrase carefully, verify the edition year and read the Supplementary Conditions.

FAQ

Specs say one thing, drawings say another: who wins?

Under typical CCDC 2 terms, technical specifications and material and finishing schedules generally outrank drawings when a true conflict exists, subject to later-dated documents and the annotation and dimension rules. Under typical AIA A201 terms, the documents are complementary and drawings and specs often share equal authority, with the architect interpreting design intent unless the Supplementary Conditions set a different hierarchy. Confirm on your signed form.

Does order of precedence override an addendum?

Usually the opposite: amended or later-dated documents, addenda and Modifications typically govern earlier documents of the same type. Always check whether the addendum expressly revises the conflicting provision.

Is an RFI the same as a claim notice?

No. An RFI seeks clarification of the Contract Documents. A claim notice preserves entitlement to more money or time (or other contractual relief). If an RFI response changes cost or time, follow the claim and notice procedure in the governing contract.

What if we already built to the wrong reading?

Document the as-built condition, stop related work if it is safe and contractually allowed, give notice per the contract and ask for written direction on correction versus acceptance. Recovery depends on notice timing, causation and the form’s claim provisions. Bring in project counsel for material exposure.

Do finishing schedules count as specifications or drawings?

On CCDC-style ladders, material and finishing schedules typically sit above drawings and below or alongside the technical specifications. On A201-style jobs, schedules are part of the Contract Documents and are read with the drawings. Either way, do not treat them as informal colour selections.

Can Supplementary Conditions change the default rules?

Yes. Supplementary Conditions and owner amendments routinely alter priority, RFI mechanics and notice periods. They are among the first documents a contract administrator should tab at kickoff.

Catch conflicts while they are still cheap

Document conflicts rarely announce themselves as legal puzzles. They show up as mismatched PDFs, stale field sets and RFIs written too late. Teams that continuously cross-check the Agreement, General and Supplementary Conditions, specifications, schedules and drawings, and that attach clause citations to their RFIs and notices, resolve conflicts while the options are still cheap. Telamont runs that cross-check continuously, so contract administrators see the clause behind each discrepancy next to the sheets and sections involved, long before installation.

The industry agrees on the method. In the Arcadis survey, respondents ranked contract and specification reviews among the most effective ways to avoid claims, close behind good communication.