A bidding proposal template will include: DOWNLOAD THE TEMPLATE. 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.If you're a plumbing contractor or company, our sample plumbing proposal template provides an example for preparing quotes or repair estimates. How to Write A Proposal for Plumbing Services? 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.