A homeowner asks three plumbers to quote a repipe. Two of them say a number out loud in the hallway and promise to text it later. One hands over a written breakdown before leaving, with the scope spelled out, the fixtures listed, and what happens if something turns up inside the wall.
Guess which one gets the job, even at a higher price. The estimate is not paperwork you do after the sale. In plumbing, it usually is the sale, because the customer cannot evaluate your pipe work and can absolutely evaluate your proposal. This is how to write one that closes.
The single biggest failure in plumbing estimates is leading with a number and leaving the work vague. "Repipe house, $9,400" invites exactly one question, and it is about the number. Instead, describe the job so specifically that the price feels like a consequence of the work rather than an opinion.
Scope should answer, in plain language a homeowner understands: what you are replacing or installing, where, with what material, and what condition you are leaving things in. Not "replace supply lines" but "replace all hot and cold supply lines from the main shutoff to every fixture on both floors with PEX, including new shutoff valves at each fixture."
Write it the way you would explain it standing in their kitchen, because that is where they will read it. A scope the customer actually understands is a scope they can say yes to.
A single lump sum makes a homeowner feel like they are being asked to trust a stranger with four figures. An itemized estimate makes the same total feel accounted for. It also gives you somewhere to point when they compare you to a cheaper bid that quietly excluded half the work.
For most residential plumbing jobs, that means listing:
One caution: itemizing is not the same as exposing your margins. You are showing the customer the shape of the job, not your supply house invoice. Materials are priced at your price, and nothing on the estimate should be labeled "markup."
Exclusions feel awkward to write and they are the most protective paragraph on the page. Plumbing lives behind drywall and under slabs, which means the honest answer to "what will this cost" often has a boundary on it. Draw that boundary in writing, before the work, when it reads as professional rather than as an excuse.
Common plumbing exclusions worth stating plainly:
Plumbers get punished for honesty here more than any other trade, because the guy who ignores the risk quotes lower and looks better on paper. The fix is not to pretend the unknown does not exist. It is to tell the customer exactly what happens if it shows up.
A sentence like this does more for your closing rate than a lower number: "If we open the wall and find the drain line is cast iron and failing, we will stop, show you a photo, and give you a written price for the additional work before we continue. Nothing gets added without your approval."
That converts an unpriced fear into a managed process. Homeowners are not afraid of surprises so much as they are afraid of being trapped by one. Two options work well when the risk is real: quote a defined allowance for the likely condition, or quote the visible scope and attach the change-order process above. Either beats an artificially low number that turns into an uncomfortable conversation in their hallway.
The estimate is where money terms belong, because it is the last moment the customer is still deciding rather than reacting.
When there is a legitimate range of solutions, presenting two or three tiers usually outperforms a single price. A water heater is the classic case: a standard replacement, a higher-efficiency unit, and a tankless option with what each means for cost, lifespan and hot water capacity.
This works because it changes the customer's question from "should I do this or not" into "which of these do I want," and because it lets the budget-driven customer stay with you instead of calling somebody cheaper. Keep it to three at most. Beyond that you are creating paralysis, not choice.
Speed is the most underrated variable in estimating. The plumber whose written estimate arrives while the homeowner still remembers the conversation has an enormous advantage over the one who sends it Thursday. By Thursday, two other plumbers have already quoted and the customer's memory of your visit is gone.
Aim to send it before you leave the street. Not a scribbled number on a business card, and not a verbal price they will misremember. A written, itemized estimate they can read on their phone, sitting in the driveway, is a different product from everyone else's and it costs you five minutes.
Then make it easy to say yes. An estimate the customer can approve with a tap, rather than one requiring a callback during business hours, closes more jobs simply because approval happens in the moment of enthusiasm instead of three days later.
A large share of estimates never get a yes or a no. They just go silent, and most plumbers read that as rejection. Usually it is not. The homeowner got busy, a kid got sick, they meant to call you back on Monday and it is now the following month.
One polite follow-up a few days later recovers work you already did the labor of quoting. It costs nothing and it is the cheapest job you will ever win. Automating it means you never have to remember.
Everything above is standard practice at a well-run shop and completely impractical if you are handwriting proposals at the kitchen table at 9pm. Which is why most solo plumbers do not do it, and why doing it sets you apart so quickly.
With FieldForge you say the job out loud on site, for example "replace a forty-gallon gas water heater, new shutoff and expansion tank, two and a half hours labor", and it builds the itemized estimate from your price book with your rates and tax. The customer gets a link, reads it on their phone, approves it with a tap, and can even pay a deposit right there. If they go quiet, the follow-up sends itself. When they say yes, the estimate becomes the invoice without you retyping anything. Our plumbing invoice guide covers the other half, and the free invoice generator runs in your browser with no signup.
You are already the better plumber. The estimate is just where the customer finds that out before the work starts.