Bids will be accepted from only those companies that request and receive written Authorization to Bid from IDOT's Central. Bureau of Construction.Craft persuasive bid proposals for construction projects with this comprehensive guide. Explore key components, from project overview to pricing details. The complete bid or proposal must be submitted to the Department of Procurement Services before the date and time specified. In this blog, we will teach you how to write an effective construction proposal that stands out from the competition. Once you have the final price for your construction bid, you are ready to put together your proposal. It's important to keep proposals short and to the point. Below is a list of forms and information that may be required to complete a Request for Proposal Response.