Contracts

What are contract documents in construction?

Contract documents are the complete set of papers that together make up a construction contract: the agreement, the general and supplemental conditions, the drawings, the specifications, addenda issued before signing, and modifications issued after.

A contractor and plan reviewer discuss drawings and permit paperwork across an office desk.
Keep plans, permit requirements and approvals together when preparing construction work. AI-generated illustration.

When someone says "it's in the contract," on a construction job they usually mean it is somewhere in the contract documents. The signed agreement may be 15 pages, but it pulls in hundreds of drawing sheets and a project manual of specifications by reference. All of it is the contract. A requirement buried in a mechanical spec section binds the GC just as much as the price on page one.

What is typically included

  • The agreement between owner and contractor, which sets price, time, and parties. See owner-contractor agreement.
  • General conditions setting rights and duties, such as payment, changes, claims, and insurance. See general conditions.
  • Supplemental conditions that modify the general conditions for this project. See supplemental conditions.
  • Drawings and specifications, including Division 01 general requirements.
  • Addenda issued during bidding. See addendum.
  • Modifications after signing: change orders, change directives, and written interpretations.

What is usually not a contract document: the bid instructions, the geotechnical report (often listed as reference only), shop drawings, and submittals. Each contract decides this for itself, so check the list in the agreement.

How it works on a real job

Say a concrete sub bids a $780,000 package off the drawings. The structural sheets show a 4-inch slab on grade. Spec section 03 30 00 calls for a vapor retarder under all interior slabs. The drawings say nothing about it. Is it in the scope? Under most contracts, yes. The documents are read together, and what is required by one is required by all. The sub that skipped the spec section is on the hook for the vapor retarder.

Now say the drawings show a 4-inch slab and the spec says 5 inches. That is a true conflict. Many contracts set an order of precedence (for example, agreement, then supplemental conditions, then general conditions, then specs, then drawings), or they require the contractor to raise the conflict by RFI and follow the architect's answer. Some contracts say the more expensive requirement governs. Read the clause before you bid, and price the conflict the way the contract tells you to.

Common mistakes

  1. Pricing from drawings alone and never reading the specs.
  2. Missing an addendum that changed the scope.
  3. Not checking which documents a subcontract incorporates. Many subcontracts flow down the entire prime contract through a flow-down clause.
  4. Building to a conflict without asking, then arguing about it later.
  5. Assuming reference documents like soil reports are guaranteed information.

Related terms

See scope of work, construction documents phase, and executed contract. The guide on how to read a construction contract before signing goes clause by clause.

Frequently asked questions

Are drawings part of the contract?

Yes, when the agreement lists them as contract documents, which standard forms do. They are as binding as the written agreement.

Is a bid proposal a contract document?

Usually not, unless the agreement specifically lists it. If your clarifications and exclusions matter, make sure they are attached to the agreement or subcontract.

What happens when the drawings and specs conflict?

The contract usually sets an order of precedence or requires the contractor to ask the architect. If the contract is silent, courts apply general interpretation rules, which is an expensive way to find out.

Are change orders contract documents?

Yes. Once signed, change orders and other modifications become part of the contract documents.

Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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