Download our free plumbing proposal template and see how ServiceTitan solves the challenges of the proposal process. Once you customize your free plumbing bid template, our platform allows you to download it as a PDF or immediately send it as a private link via email.With these essential nine steps, you'll learn how to create a takeoff, calculate costs and write a proper proposal for any plumbing job you want. Vendors must fill in all blank columns on items being proposed such as Vendors Brand Name and. Attachment C1200: Bid Submittal Forms.