Which document must a winning bidder sign with the owner?

The correct answer is the contract, as this is the formal agreement that outlines the terms and conditions under which the work will be performed. Once a bid has been accepted by the owner, a legally binding contract is necessary to ensure that both parties are aware of their rights and responsibilities. This document typically includes details such as scope of work, payment terms, deadlines, and dispute resolution processes.

The contract serves as a safeguard for both the owner and the winning bidder, providing a framework for accountability and clarity. It is essential to have this signed document to prevent misunderstandings and establish a professional relationship between the parties involved. In many cases, the bid documents and proposal may serve as part of the basis for the contract, but they do not replace the need for a formal contract itself. An affidavit, on the other hand, is often a sworn statement and not a binding contract, which further emphasizes why a contract is the necessary document for this situation.