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TradeFlare BlogHow to Write a Plumbing Invoice Customers Pay on the Spot
If you're wondering how to write a plumbing invoice that gets paid without a phone call later, the answer is mostly clarity. A customer who understands the bill pays it. Here is a step-by-step layout that works for service calls, drain jobs and water heater swaps.
Step 1: Header and customer details
Put your business name, phone, email and license number (if your city or state requires it) at the top. Add the customer's name, the service address and an invoice number. Number invoices in order so you can find them later and your bookkeeper can match payments.
Step 2: The problem, in the customer's words
Start the description with what the customer called about: "Kitchen sink draining slowly, backing up into second basin." It reminds them why you came and frames the rest of the invoice.
Step 3: What you found and fixed
Write what you found and what you did. "Cleared grease blockage in kitchen line with cable machine, approx. 15 feet. Flushed line, tested drain flow." If you camera-inspected the line, say so. If you found something you didn't fix, like corroded supply lines, note it as a recommendation.
Step 4: Parts and materials
List each part with a price. For a water heater, list the unit, the expansion tank if you added one, fittings and the haul-away. Customers rarely argue with parts they can see on the list.
Step 5: Labor and after-hours charges
Show labor as a flat rate per task or as hours times your rate. If the call came in at night or on a weekend, show the after-hours charge as its own line. Mention it on the phone when the call is booked too, so it's no surprise.
Step 6: Totals, tax and terms
Subtotal, tax where it applies, any discount, and the total. Then the terms: "Due on completion" for most residential work. For property managers, add a due date and a purchase order number if they gave you one.
Step 7: Warranty and next steps
Write your workmanship warranty and any manufacturer warranty. If you recommended follow-up work, add it here with a rough price range so the customer can plan.
Step 8: Collect before you pack up
Walk the customer through the invoice at the sink or the water heater. Take payment while you're there. If the homeowner isn't home (a tenant let you in), send a pay link to the person responsible and set a reminder.
Common plumbing invoice mistakes
- Vague lines like "plumbing repair, $350."
- Leaving off the after-hours charge and adding it later.
- Forgetting the permit fee on a water heater replacement where a permit is required.
- Sending the invoice days later from the office.
Your next step this week
Pick your three most common plumbing jobs and write a model invoice for each, with the description, parts and labor lines filled in. Save them as templates or price book items. Next time, you only change the details, and every invoice goes out on site in a couple of minutes.
How TradeFlare helps
Quotes, change orders and invoices. Build quotes from your price book, let the customer sign right on the quote, add change orders when the job changes, and create the invoice from the quote, the job or from scratch. Past-due invoices get a friendly reminder automatically.
Card payments on the invoice. Tap Collect payment and text a secure Stripe pay link or show a QR code; the customer pays by card or bank transfer on their own phone and the invoice flips to Paid. Payments run on your own Stripe account. TradeFlare adds no fee of its own (Stripe's standard fees apply). There's no card reader or Tap to Pay yet.
Hear TradeFlare's own AI front desk any time at (855) 651-5075.
Video: Plumber App With AI Phone Answering - A Job Day Before & After
Frequently asked questions
What should a plumbing invoice include?
Business and license details, customer and service address, invoice number, the problem, what you did, parts, labor, after-hours charges, tax, total, payment terms and warranty.
Should I charge a trip fee on a plumbing invoice?
Many plumbers do, especially for diagnostics. If you charge one, say so when the call is booked and show it as its own line on the invoice.
How do I get paid on the spot for plumbing work?
In TradeFlare, create the invoice from the job, then tap Collect payment and text a Stripe pay link or show a QR code. The customer pays by card on their phone. Payments go to your own Stripe account.