Construction contractors interested in performing construction contracts with the department must first complete the Vendor Registration process. (c) Electronic submission of bids.Bidders must complete and properly sign, in ink, the RFQInvitation For Bids form. Bid prices must be typewritten or in ink. There are many different rules that govern public bidding in Pennsylvania, many of which can be found in the Commonwealth Procurement Code. Generally, the requirements set forth in a bidding document are mandatory and must be strictly adhered to in order for a bid to be valid. Sealed bidding is a method of contracting that employs competitive bids, public opening of bids, and awards. Public Works contracts include bids for the construction, reconstruction, alteration, repair, or improvement of public: