How do I submit a bid or proposal? All formal bids and proposals shall be submitted as specified in the solicitation document.Here, you'll find details about contracting opportunities, vendor qualifications, proposals and how to bid on projects. Obtain a Surety Bond. The ADOT construction contract you are bidding likely requires a surety bid bond or other proposal guaranty. To become a vendor with the city, you must complete the vendor self-registration process. It takes the city about two business days to approve the registration. Present your bid in a legible, accessible, and preferably typed format. Include your scope of work 48 to 72 hours before the bid that you are pricing. Formal solicitations must be issued and available to vendors for at least 14 days.