What is the type of contract called when one contractor takes on all design and construction responsibilities?

The type of contract where one contractor takes on all design and construction responsibilities is known as a Design/Build contract. In this arrangement, a single entity or contractor is responsible for both the design and construction phases of a project. This integration can lead to greater efficiency and cohesion, as the contractor can streamline communication and decision-making processes between design and construction teams.

With the Design/Build approach, the client typically has a single point of contact, which can simplify project management and lead to better outcomes regarding timing and cost. This contrasts with other contract types where separate entities handle design and construction, potentially leading to miscommunication and delays.

In contrast, a Turnkey contract generally consists of delivering a completed project to the client where the contractor handles all aspects, but it does not always imply responsibility for design. Fast Track refers to a project schedule method where design and construction phases overlap, which contrasts with the single-responsibility model of Design/Build. Single prime contracts involve a general contractor managing multiple subcontractors but do not integrate design and construction under one contract.