Skip to main content
Back to Glossary
Estimating & Biddingaka: specsaka: project specifications

Specification

In Plain English

The written document that describes the required quality and standards for all the work on a project.

Definition

A specification is a written document that describes the quality, performance standards, materials, and workmanship requirements for construction work. Specifications complement drawings by providing information that cannot be shown graphically. Together, drawings and specifications define the complete requirements contractors must meet.

Why It Matters in Bidding

Specifications govern the quality side of a bid while drawings govern quantity, so estimators must read both to price correctly; a product spec'd as a premium brand or a higher performance grade can swing material costs dramatically. Missing a spec requirement during takeoff is one of the most common causes of underbidding and post-award disputes.

Example

While pricing a school project, the estimator catches in the specs that all interior doors must be solid-core fire-rated rather than the hollow-core units shown generically on the drawings, and adjusts the door allowance up before submitting.

Related Terms

Bid DocumentsDrawingsCSI MasterFormatScope of Work

Frequently Asked Questions

Most contracts include a precedence clause, and specifications typically govern quality, materials, and workmanship while drawings govern dimensions and quantities. When a conflict surfaces during bidding, submit an RFI rather than guessing, since the answer often comes back as an addendum that changes pricing for every bidder.
Prescriptive specs name exact products or methods, performance specs state required results and let the contractor choose the means, and proprietary specs name a brand. Each carries different risk: performance specs shift design responsibility to the contractor, so estimators should price the means-and-methods exposure, not just the material.
An 'or equal' clause lets contractors substitute a product they judge equivalent, often lowering material cost. Many specs require pre-approval of substitutions before bid or within a set window after award, so estimators should base the base bid on the named product and note potential savings as a voluntary alternate.

Need more than definitions?

Get AI-powered bid alerts, automated form filling, and proposal drafting.

Start Free Trial

© 2026 ConstructionBids.ai — A LaderaLabs Product