Project delivery methods

Learn more about A+B bidding, a method of bidding used on some projects that rewards a contractor for completing a project as quickly as possible.

Design-build is a method of project delivery in which WSDOT executes a single contract with one entity (the design-builder) for design and construction services to provide a finished product.

Learn more about how we use flexible start dates to allow the contractor some discretion in establishing when a project's working days will start. This provision is used in specific projects where it would yield favorable results, including lower cost and more efficient use of contract time.

Interim completion dates allow us to address concerns of local agencies, businesses, and the traveling public with regard to the duration of a portion of a contract.

Lump Sum Traffic Control is a method to streamline all traffic control unit items into a single item. The contractor submits a single lump sum bid for developing, implementing and maintaining traffic control on a contract.