How to Invoice After a Bathroom Remodel: The Plumbing Half

Short answer: How to invoice after bathroom remodel plumbing work: bill it in three pieces, not one. A deposit or rough-in invoice when the walls are open and the DWV and supply are in, a progress invoice when the top-out passes inspection, and the final at trim-out when every fixture runs. Quantities come from a fixture count you defined in writing — supplied outlets, not appliances — plus feet of pipe by size and material. Final holds until the inspection card is signed.

A bathroom is the job where the plumber shows up three times across four weeks, does the expensive part first, and gets looked at last. That shape decides the billing, not the calendar. The field list every version of this document needs is in what to include on an invoice, and the fast, single-visit version of plumbing billing is a different animal entirely, covered in how to invoice after a plumbing service call.

Why does a bathroom remodel bill in three pieces instead of one?

Because your money leaves in week one and the room is not usable until week four. Rough-in is where the pipe, the fittings, the valve bodies, the closet flange, and most of the labor hours go. Trim-out is a day. Bill it as one invoice at the end and you have financed someone’s bathroom for a month with your own supply house account.

The phases also come with a built-in referee, which almost no other trade gets. An inspection sign-off is a third party confirming the work is complete and correct, and it makes a far better billing trigger than “we think we’re done.”

Phase	What is finished	What the invoice covers	Trigger to send it
Mobilization	Nothing yet	Deposit sized to ordered material and permit	Contract signed, permit applied for
Rough-in	DWV, water lines, valve bodies, tub or pan set	Pipe, fittings, valves, rough labor	Walls open and ready to cover
Top-out and inspection	Pressure and DWV tests held	Balance of rough labor	Inspection card signed
Trim-out	Every fixture set, running, and leak-free	Fixtures, trim, seals, final labor	Final walk with the customer

Two of those invoices depend on other people finishing their part. The wall does not close until the inspector passes it, and the toilet does not set until the tile is grouted and cured. Write the dependency into the schedule of values so a delay caused by the tile setter does not read as a delay caused by you.

What counts as a fixture, and why does the invoice have to define it?

A fixture on a plumbing invoice is a supplied outlet, not an object a homeowner can point at. That gap is where the money disappears, because the customer counts what they see and you counted what you piped.

What the customer calls it	What you actually connected
One vanity, double sink	Four supplies, two traps, two drains
One shower	One valve body, one head, sometimes a hand shower drop, one drain, one pan or liner
One tub with a shower	Valve, spout, diverter, waste and overflow, one drain
One toilet	One cold supply, one stop, one flange, one closet bend
Freestanding tub filler	Floor or wall rough, two supplies, its own blocking
”Just move the toilet over”	A new closet bend, a cut floor, and possibly a joist you are not allowed to notch

Write your definition on the estimate in plain words, then carry the same words onto the invoice. When the two documents count differently, the difference becomes a discount whether you meant it as one or not.

Which lines belong on the plumbing side of the bill?

Everything below is a separate line, and the ones that get skipped are the ones nobody sees after the drywall closes.

• Demolition and removal of the old fixtures, the old tub, and any galvanized or cast iron coming out, with haul-away and the dump ticket behind it.
• DWV, by diameter and feet: the 3 in closet bend, the 2 in shower drain, the 1-1/2 in lav arm, the vent, and every fitting that made the fall work.
• Water lines, by size, material, and feet, with the material named on the line. Fourteen feet of PEX-A off a manifold and fourteen feet of type L copper are not the same line item and should never carry the same price.
• Valve bodies and stops, counted, each. Pressure-balancing or thermostatic valves are a real spread in cost and belong itemized.
• Shower pan, liner, or base set, plus the pre-slope if you built one.
• Blocking, strapping, and hangers — cheap material, real hours.
• Opening and repairing walls, floors, or a ceiling below, in square feet, with a stated disposition of who closes it.
• Permit and inspection, at cost, on its own line.
• Access and floor difficulty: a second-story bath over a finished ceiling, a slab-on-grade toilet relocation, a third-floor walk-up with no elevator.

How do the permit and the inspections show up on the invoice?

As their own line at your actual cost, with the permit number printed on the document. Bathroom work that moves or adds a drain, a vent, or a water line is usually permitted and inspected work, and the local jurisdiction — not the homeowner and not the GC — decides what triggers it. Call the building department before you quote, because the answer changes the price and the schedule together.

Two consequences follow for the bill. The rough inspection is your progress-invoice trigger, so put “invoiced upon rough inspection approval” on the schedule of values in writing. And any code item the inspector requires that was not on the estimate — an added cleanout, a vent correction on old work you tied into, an accessible shutoff — is a change order signed before you do it, not a surprise on the final invoice.

Which conditional items from the estimate turn into real lines?

A bathroom estimate should carry conditional lines with prices already attached, because half of what you will find is under a floor you have not opened. When one comes true, it converts to a signed change order at the price already agreed, and the argument never happens.

Conditional line on the estimate	What triggered it	How it converts
Cast iron or galvanized replacement	Found once the floor came up	Priced per foot, plus transition fittings and support
Subfloor or joist repair	Rot around the old flange or tub	Time and material, or a per-sq-ft allowance
Toilet relocation beyond the stated distance	Layout changed after demolition	New closet bend, floor cut, patch
No accessible shutoff for the bathroom group	Discovered at demo	Added ball valve and access panel
Venting correction on existing work	Called by the inspector	Change order, signed before the fix
Non-standard valve rough depth	Tile thickness or a thick wall system	Extension kit, extra trip

The rule that keeps this honest: conditional lines are for what the roof of a floor is hiding, not for what you could have seen standing in the room. A cramped access you walked past during the site visit is your estimating problem. Rotten framing under a forty-year-old tub is not.

What changes when the customer supplied the fixtures?

The whole risk profile, and the invoice has to say so in a sentence. Customer-supplied trim means no material margin for you, no control over what shows up, and a warranty you cannot honor. It also means a missing part stops the trim-out day and you eat the trip.

Print it on the invoice: fixtures supplied by owner, installation only, manufacturer defects and missing components excluded from workmanship warranty, and return trips caused by owner-supplied items billed at your service rate. Then bill the labor at the rate that reflects the extra handling, because unboxing, inventorying, and chasing a missing cartridge is time you spent.

Either way, record the model number and the flow rate of everything you set. A WaterSense labeled bathroom faucet is capped at 1.5 gpm, a showerhead at 2.0 gpm, and a labeled toilet at 1.28 gpf, and those figures are what a utility rebate form or a resale disclosure will ask for a year from now. The invoice is the only document that will still have them.

Does it bill differently when a GC sits between me and the money?

Substantially, and mostly in timing rather than content.

Direct to homeowner	Sub to a general contractor
Three invoices on your own schedule	Pay application on the GC’s monthly cutoff date
Due on receipt at final walk	Net 30 or Net 45 from the GC’s own draw
No retainage	A retained percentage held to project close
You collect at trim-out	Lien waiver signed against each payment
Change orders approved by text	Change orders approved in writing before work, or not paid

Missing the GC’s cutoff by one day pushes an entire month, which is why the rough-in invoice on a GC job should be dated to the cutoff and not to the day the inspector left. The follow-up habits that actually move money out of a slow account are in how to get clients to pay.

What do I hand over at trim-out, and how do I collect the final?

Walk the room with the customer and run everything in front of them: both lav faucets hot and cold, the shower to temperature, the diverter, the tub filler, the toilet flushed twice, the drains checked for standing water. Then hand over four things — the signed inspection card, the before-and-after photos including the open-wall rough-in shots nobody will ever see again, the fixture model numbers and where the stops are, and the warranty split in three sentences: what the manufacturer covers on the fixture, what your workmanship covers on the installation, and how long each runs.

Collect the final at that walk. Every day after it, the customer’s memory of the water damage in the ceiling below fades and the memory of the mess in the hallway sharpens. If they pay on the spot, hand back a receipt rather than the invoice again, and file both — the reason for keeping the pair is laid out in how long to keep tax records.

How do I price the phases so cash arrives before I spend it?

The unit is fixtures and feet, but the schedule is what keeps you solvent.

1. Take off the job in real quantities. Fixture count by your own definition, feet of each pipe size and material, fitting count, valve count, and square feet of opening.
2. Price material at landed cost, including freight, the fittings nobody counts, and the waste you will actually cut off.
3. Estimate hours by phase from your own past jobs, not from a book. Demo, rough, top-out, trim.
4. Multiply by your loaded hourly cost: wage plus payroll burden, plus the van, insurance, license and bond, tools, and the office.
5. Divide overhead across billable hours, not clock hours. Six sold hours out of a nine-hour day is a common reality once drive time and supply runs come out.
6. Add profit as a margin, not a markup. Add 30 percent to $4,000 of cost and you bill $5,200 and keep $1,200, which is a 23 percent margin. To actually keep 30, divide by 0.70 and bill $5,714. On a handful of bathrooms a year that difference is a truck payment.
7. Front-load the schedule of values to match your spend. Rough-in carries the material and the hours, so it should carry the matching share of the price.

Published averages for bathroom rough-ins are a sanity check only. They swing hard with region, permit regime, material choice, whether the house is on slab, and how old the existing waste line is. Your own numbers decide whether the job was worth the four weeks.

What stays in the file when the room is done?

The three invoices under one numbering series, every supply house receipt, the permit and the signed inspection card, the open-wall photos, the pressure test note, and each signed change order. That set is your answer to a warranty claim, a resale disclosure question, and the tax return.

Keel is an iOS app that runs entirely on the device — no account, no bank connection, no cloud, no login, and an App Store privacy label reading Data Not Collected. On a phased job the useful part is that all three invoices come out of the same numbering series with your logo and brand color, each one built on the phone in about a minute at the moment the phase closed rather than reconstructed at the end of the month. Supply house tickets get photographed at the counter and read on-device by Apple Intelligence, so the material behind the rough-in line has paper attached when someone questions it. Freeboard shows what is actually yours right now — cash minus a tax reserve, minus the invoices you have committed but not collected, minus your buffer — which on a trade that spends in week one and collects in week four is the number that matters. The year exports as a single file, or as the Accountant Pack: a CSV plus a one-page summary PDF. Free is $0 with unlimited invoices, receipts, and mileage. Keel Pro is a one-time $249.99 Lifetime purchase, not a subscription.

Frequently asked questions

Should a bathroom remodel be one plumbing invoice or several?

Several. The material and most of the labor go in at rough-in, weeks before the room is usable, so a single invoice at the end means financing the job yourself. Bill a deposit against ordered material and the permit, a progress invoice when the rough passes inspection, and the final at trim-out when every fixture runs.

What should the deposit on a bathroom rough-in cover?

Material you have to order and the permit fee, not profit. Size it to what actually leaves your account before you start: fixtures on order, valve bodies, pipe, and the permit. Some states cap residential deposits or regulate how they are held, so check your own home improvement rules before setting a percentage.

How do I count fixtures so the customer counts the same number?

Define a fixture as a supplied outlet in writing on the estimate, then repeat that wording on the invoice. A double vanity is four supplies, not one vanity. A tub-shower is one valve with a spout, a diverter, and a waste and overflow. When the two documents disagree, the gap turns into a discount you never agreed to.

Who pays when the inspector requires something that was not in the estimate?

The customer, through a signed change order written before you do the work. Put the likely candidates on the estimate as conditional lines with prices attached — vent corrections on existing work, an added cleanout, an accessible shutoff — so the conversation is a signature rather than a negotiation with the wall already open.

Can I invoice the final before the tile is grouted?

No, because the toilet and the shower trim cannot be set until it cures, and the final invoice is supposed to mean the fixtures run. What you can do is invoice the rough and top-out on their own triggers so the delay sits between two paid phases instead of holding your whole bill hostage to another trade’s schedule.

What do I put on the invoice when the homeowner supplied the fixtures?

A line stating fixtures supplied by owner, installation only, with manufacturer defects and missing parts excluded from your workmanship warranty and return trips billed at your service rate. You carry the handling and the schedule risk without any material margin, so the labor rate on that line should reflect it.

---

This article is general information, not professional or tax advice.