A procurement or project delivery arrangement whereby a single entity (a contractor with subconsultants, or team of contractors and engineers, often with subconsultants) is entrusted with both design and construction of a project. This contrasts with traditional procurement where one contract is bid for the design phase and then a second contract is bid for the construction phase of the project.

Design-Build is a project delivery method which combines architectural and engineering design services with construction performance under one contract agreement.

The entity contractually responsible for delivering project design and construction. The Design-Builder can assume several organizational structures, the four most common being a firm that possesses both design and construction resources in-house; a joint venture between designer and contractor; a contractor-led team with the designer in a subcontractor role; and a design-led team with the contractor in a subcontractor role.