The City of San Diego provides you with direct access to bidding and contracting opportunities on all its construction projects. To become prequalified to bid on City of San Diego public works projects, all other contractors must complete the online Prequalification Program Application.RESPONSE FILE: Proposers will only be able to upload one (1) document in the "Response File" section of PlanetBids. Learn how the County buys products and services. Search contracts, find open solicitations on BuyNet. Proposal Form: Complete, sign and submit form. 2. We welcome all licensed contractors who are interested in submitting their company details for inclusion on the District's Informal Bidding Contractors List.