Form S3B-3 (Business Self-Certification). This section includes an example construction bid and contract with certifications and forms.Construction Bid Forms are a way to communicate interest on a construction project and provide a contractor's estimate on costs, timelines, terms and details. This Invitation to Bid can be used for construction procurement. Download free, customizable construction bid templates and forms to track, manage, and appropriately estimate project bids. Bidder must be a Prime Contractor in the major construction discipline governing this Project. Vendors shall submit ONE (1) ORIGINAL AND THREE (3) COPIES of their bid. All bids should be identified as "Sealed Proposal - Town Senior Center Project".