Which document outlines the responsibilities of parties in a construction project?

The document that outlines the responsibilities of the parties in a construction project is the contract. A contract serves as a legally binding agreement that specifies the terms and conditions under which the work will be performed. It details the obligations of both the contractor and the client, including project scope, deadlines, payment terms, and specific responsibilities related to materials and labor.

In contrast, a project plan primarily focuses on the logistics and schedules for executing the construction tasks rather than delineating the legal responsibilities of the involved parties. An estimate provides a cost breakdown and projected expenses but does not define the obligations of the parties involved. An invoice is a request for payment after work has been completed and does not outline responsibilities for the project. Thus, the contract is essential for establishing clear responsibilities and ensuring that all parties understand their roles within the project.