The invoice app for UK plumbers.
Voice note in. Branded PDF invoice out — 15 seconds. Quotes, receipts, tax — all through WhatsApp. No app to install.
£29.99/mo · 7 days free · no card needed
Start Free on WhatsAppTry it in your head. A real plumber’s voice note:
“Mrs Davies, boiler install, Worcester Bosch twelve hundred, flue kit eighty-five, labour six hours at sixty quid.”
Plumbers don’t have desks. You work between boilers and under sinks, you price jobs from your van, you lose invoices in the same pocket as your pipe cutter. Holdfort is built for that reality — it turns a 15-second voice note into a branded PDF invoice your customer gets before you’ve left the driveway.
Common plumbers jobs on Holdfort
Boiler installs
Voice-note the make, model, labour and parts once; Holdfort prints the Gas Safe number, Benchmark reference and warranty info on every install invoice automatically.
Emergency callouts
Out-of-hours callout fees, parts-from-your-van lines, plus card-taken-on-site notes — all captured in a 20-second voice note in the cab at 2am.
Bathroom refits
Multi-day project tracking with stage invoices (strip-out, first fix, second fix, final). Running total against quote visible at every point.
Landlord checks
Annual gas safety records issued as CP12-style PDFs in the same WhatsApp chat, addressed to the letting agent or landlord of record.
How plumbers actually use it day-to-day
The typical Holdfort plumber invoice takes about 25 seconds total: 15 seconds of voice note, 10 seconds to check the PDF and reply SEND. Compare that to a handwritten duplicate book (8 minutes, no record of payment status) or a laptop-based accounting app (12 minutes, plus logging in, plus finding the right job). The difference over 1,000 invoices a year is enormous — roughly 120 hours of your time, which at a typical plumber hourly rate is ~£6,000 of billable time you’ve been giving to paperwork.
Questions plumbers ask us
Yes. Add your Gas Safe number to your profile once and it prints on every invoice footer — customers, landlords and letting agents all get it on the PDF without you having to type it. Forward a photo of a parts receipt (boiler serial number on the box, valve batch on the packaging) and Holdfort captures the numbers alongside the invoice for your records. Helpful if a manufacturer warranty claim comes up three years later.
That’s the default. Say "callout fifty, labour two hours at sixty, parts ninety-five" in a voice note and you get three clean lines on the invoice. Customers appreciate seeing the breakdown — it reduces disputes because they can see exactly what they’re paying for and why.
Log the time and rate in the voice note — "2am callout, emergency rate £95/hr, one-point-five hours" — and Holdfort builds the invoice at your out-of-hours rate with a clear line showing why the total is higher than a daytime job.
If you’re WIAPS-approved (Water Industry Approved Plumbers Scheme), your approval number prints on the invoice footer the same way Gas Safe does. No separate upload, no separate portal — just register the number once.
£29.99/month, inc. VAT. 7 days free. No card to start. Founding-member price locked for life. See the pricing page.
No. Holdfort is WhatsApp — the one you already have. There’s nothing to install and no login to remember.
Yes. Quarterly-ready breakdowns, sole-trader categories, no spreadsheets. Ready for MTD for Income Tax from April 2026.
Finish the job. Voice note the details. Invoice done.
7 days free. 30 seconds to set up. Just WhatsApp.
Start Free on WhatsAppHold the fort. We’ve got the paperwork.