Contracts

What are specifications in construction?

Specifications (specs) are the written part of the contract documents that describe the required materials, products, quality standards, installation methods, and submittals for each part of the work. The drawings show where and how much; the specs say what and how well.

Two construction professionals review paper plans beside a tablet at a jobsite workbench.
Plan reviews connect field conditions, drawings, and the next decisions on a job. AI-generated illustration.

Specifications are the project manual's instructions for each trade. A floor plan shows a wall. The spec section for that wall type tells you the stud gauge, the board type, the fastener spacing, the acceptable manufacturers, the finish level, the testing required, and what has to be submitted before you start. Together with the drawings and the agreement, specs make up the contract documents.

How specs are organized

Most U.S. commercial projects organize specs using CSI MasterFormat, a standard outline with 50 divisions numbered 00 to 49. Division 00 covers procurement and contracting requirements, and trade divisions follow, such as Division 23 for HVAC and Division 26 for electrical. Section numbers use pairs of digits, at least six digits for three levels (a drywall section, for instance, sits under Division 09, Finishes), and more levels can be added for narrower scopes. Residential jobs often use a shorter written spec or notes right on the drawings.

Specs come in a few styles. Prescriptive specs name exact products or methods. Performance specs describe the result required (load, fire rating, air leakage) and let the contractor choose how to meet it. Proprietary specs list one or a few approved manufacturers, sometimes with 'or equal' language that opens the door to a substitution request.

When drawings and specs disagree

They often do. Many contracts set an order of precedence. On federal construction, FAR 52.236-21 says that in case of difference between drawings and specifications, the specifications govern, and discrepancies in figures go to the contracting officer for a written determination. Private contracts vary: some use precedence, some say the documents are complementary and anything shown in one is required as if shown in both. Read the contract's language before bidding, not after.

A real-job example

Say an estimator with three bids due Friday prices the flooring on a medical office from the finish schedule on the drawings: sheet vinyl in exam rooms. The spec section adds a heat-welded seam requirement, integral cove base, a moisture test on the slab, and a specific adhesive. Those four lines in the spec add real cost and a testing step the drawings never mention. Had the estimator skipped the spec, the job would have been underbid and the moisture testing would have shown up as a schedule surprise.

Common spec mistakes

  • Pricing from drawings only. The spec often holds the expensive requirements.
  • Ignoring Division 01, General Requirements. Its rules on submittals, closeout, temporary facilities, and testing apply to every trade.
  • Missing referenced standards. A spec that cites a testing or industry standard incorporates it.
  • Assuming 'or equal' means anything similar. The designer decides what is equal, usually through a formal process.
  • Not flowing specs to subs. Each subcontract should name the spec sections that apply to that trade.

Related terms

Specifications work with shop drawings, submittals, addenda, and supplemental conditions. When specs and drawings leave a question, send a request for information. Smart Business Automator links RFIs and submittals to the spec sections they reference, so it is easy to see open items by trade.

Frequently asked questions

Do specifications override drawings?

It depends on the contract. Federal construction contracts under FAR 52.236-21 say the specifications govern when they differ from the drawings. Private contracts may use a different order of precedence or treat the documents as complementary.

What is the project manual?

The bound or digital volume that contains the specifications along with bidding requirements, contract forms, and general and supplementary conditions.

What is a performance specification?

A spec that states the result required, such as a fire rating or load capacity, and lets the contractor choose products and methods that meet it.

How many divisions are in MasterFormat?

MasterFormat uses 50 divisions numbered 00 to 49, with several numbers reserved for future use. Before 2004 it had 16 divisions.

Sources

  1. Acquisition.gov: FAR 52.236-21 Specifications and Drawings for Construction
  2. WBDG SpecsIntact help: CSI MasterFormat
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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