Estimating

Proposal

A contractor's document offering to perform specified work for a stated price, with scope details and terms.

A construction proposal is a written document from a contractor offering to perform a specified scope of work for a stated price under specified terms. The proposal typically includes scope of work, price, schedule, payment terms, exclusions, and any optional alternates. When signed by the owner, a proposal often becomes the contract itself.

Proposal vs estimate vs bid: an estimate is informational, a proposal is an offer (signing it usually creates a contract), and a bid is a firm price typically submitted in response to a competitive ITB. In residential remodeling, "proposal" and "estimate" are often used interchangeably; in commercial work, the distinction matters more because proposals carry contractual weight.

Frequently asked questions

What is the difference between a proposal and a bid?+

A proposal is a contractor's offer, typically prepared one-on-one with an owner, that often becomes the contract when signed. A bid is a firm price submitted in response to a competitive ITB with multiple contractors bidding the same project.

What is included in a construction proposal?+

Scope of work, price, schedule, payment terms, exclusions and clarifications, optional alternates, insurance and licensing information, and signature blocks for both parties. Some proposals attach a separate contract; others serve as the contract themselves.

Should I use a proposal or an estimate?+

Use an estimate for early-stage budgetary conversations where price may change. Use a proposal when you are ready to commit to a price and terms and want the document to serve as a contract upon signing.

Related terms

Bid

A contractor's formal price proposal to perform a defined scope of work, usually in response to a bid invitation.

Estimate

A contractor's informational projection of project cost. Non-binding and revisable; differs from a firm bid.

Contract

The binding written agreement between owner and contractor defining scope, price, schedule, and terms of the project.

Scope of Work

The written description of all tasks, materials, and deliverables the contractor agrees to perform on the project.