How do I submit a bid or proposal? All formal bids and proposals shall be submitted as specified in the solicitation document.Obtaining a building permit prior to construction or installation. Quantities of fill construction will be paid for at the contract unit price per cubic yard of fill as stipulated in the proposal. To support neighborhood housing options, the City of Maricopa offers pre-approved housing plans within the city's Heritage District. The MAG Building Codes Committee typically recommends that its members adopt the most current versions of the standard national building codes.