What is a construction proposal? What to include in a construction proposal.Preliminary building plans included. Timeline to complete the construction project. An RFP is a formal document for a new project that invites contractors to submit competitive offers, or bids, to do the work. The outside of your package must be clearly labeled with the RFP number, title, opening date and time, and the name. All proposals will be publicly opened and read aloud in the Town Council Chambers.