Want to know how you can create effective construction proposals? The Bidder must figure its Base Bid on the specified, or Addendum-approved, materials and equipment only.Craft persuasive bid proposals for construction projects with this comprehensive guide. Explore key components, from project overview to pricing details. This page is where the public copy of bidder submissions are posted for public review. Discover what a bid proposal is, the elements of a bid proposal, how to create one and a template and example that can guide you. Bidders shall submit a Bid on a unit price basis for each item of Work listed in the Bid schedule. 15.02 Supplementary Unit Prices.