Construction Contract: Page one: Date at top should be on or after date of award letter. The Design-Builder shall commence Design Phase work upon receipt of a fully executed copy of this agreement.Executive Legal drafts, reviews, and revises contracts to meet legal standards and advance your business or personal interests. In a designbuild contract, one entity, often a general contractor, contracts with an owner to undertake both the design and construction aspects of a project. When put together and signed, the custom proposal document and its attached terms and conditions comprise the binding agreement with the client. Within thirty days after the City receives an invoice, the. City shall send the Consultant a check or electronic funds transfer in payment for all undisputed.