How to Write a Plumbing Estimate

You know how to fix the leak. Writing it up so the homeowner signs today instead of “thinking about it” is a different skill. Here’s how to write a plumbing estimate that actually closes, in the order it should go on the page.

1. Scope the job in one sentence, then break it into lines

Start with what you’d tell another plumber: “Replace a 40-gallon gas water heater in the garage, haul off the old one.” Then split it: removal and install as labor, the unit and fittings as materials, haul-off as its own line. A single lump sum invites comparison shopping; itemized lines make yours the reference the others get judged against.

2. Price labor and materials separately, always

Labor — removal, install, and testing for leaks, priced at your rate.
Materials — the unit itself, fittings, and a gas connector, priced at cost plus your markup.
Extras — permit, haul-off fee, anything that’s easy to forget when you’re writing it from memory that night.

3. Name your assumptions in writing

“Haul-off included, permit not included” belongs on the document, not just in your head. This is the single biggest thing separating a plumbing estimate that holds up mid-job from one that turns into an argument about what was actually agreed to.

4. Give tank and tankless side by side if it’s relevant

If there’s any chance the homeowner asks about tankless, put both options on the page instead of waiting for the question. It reads as expertise, not upselling, when it’s already there before they ask.

5. Make accepting a 30-second action, not a phone call

The estimate should end with a way to say yes on the spot — a link to e-sign and pay a deposit, not “call me to schedule.” Every extra step between “sounds good” and “signed” is a chance for the job to go quiet.