Best invoice app for plumbers UK 2026 (real comparison from a builder)

A mate of mine, a gas and heating engineer working out of Leeds, spent the best part of a year invoicing off the back of a paper pad and a free template he'd found online. He's good at the work. The invoicing was the bit he hated, so it slid to Sunday nights, which meant customers got the bill a week after the boiler was running and half of them forgot they owed him at all.

He's not unusual. Most plumbers I know don't have a software problem. They have a "the paperwork happens last and badly" problem, and the right invoice app fixes that by making the invoice the easy bit instead of the dreaded bit.

So this is a plain comparison of the apps UK plumbers actually use in 2026, what each one is good and bad at, and roughly what it costs. No app is best for everyone. The best one is the one you'll actually open in the van.

First, decide what you actually need

Before you look at a single app, work out which of these three you are. It saves you paying for features you'll never touch.

The solo plumber. One van, maybe a labourer now and then. You raise a handful of invoices a week. You want to quote, invoice, and get paid without it eating your evening. You do not need team scheduling or a stock module.

The growing firm. Two to six lads, a couple of vans, jobs overlapping. Now you need to see who's where, what's quoted, what's invoiced, what's still owed. The invoice is one part of a bigger picture, and the app needs to hold the whole picture.

The books-first sole trader. You've got an accountant who lives in QuickBooks or Xero and wants your invoices, expenses and VAT all in the same place so Self Assessment and Making Tax Digital are painless. For you, the invoice tool and the accounting tool being the same thing matters more than trade-specific bells and whistles.

Most plumbers reading this are the first or the third. Keep that in mind as we go through the options.

The main options, compared

Prices below are correct at the time of writing in 2026 and tend to shift, so check the current figure before you commit. They're per month, usually per user, and most of these run a free trial so you can test before you pay.

TradeStash

Built for UK trades from the ground up, mobile first, so quoting and invoicing happen from the phone in the van rather than back at the kitchen table. Solo is £24.99 a month, Growth (which adds team collaboration) is £39.99, and there's a 14 day free trial with no card needed. It ties the quote, the job, the photos and the invoice to one customer record, so nothing falls down the back of the sofa. Honest limitation: it's a younger app than the big names here, so the integrations list is shorter. If you need it to plug into fifteen other tools, that's worth checking first.

Tradify

One of the better known job management apps in the UK trade world. Strong on scheduling, quoting and invoicing together, and well liked by firms running a few people. At the time of writing it's around £35 a month per user. For a solo plumber who only wants invoicing, you're paying for a lot of job management you might not use. For a growing firm, that's exactly the point.

Powered Now

A UK app aimed squarely at trades, with invoicing, quoting, and decent VAT handling built in, which matters if you're VAT registered. Pricing sits in the rough region of £20 to £35 a month depending on tier. Solid all-rounder, particularly for someone who wants UK tax handled properly without bolting on separate accounting software.

QuickBooks and Xero

These are accounting packages first, invoicing second. If your accountant already uses one, the case for matching them is strong: your invoices, expenses and VAT return all live together, and Making Tax Digital is handled. QuickBooks sits around £16 to £33 a month depending on plan, Xero in a similar range. The downside for a plumber is they're built for the books, not the job. There's no real sense of "this invoice belongs to the job at 14 Mill Lane with the three photos of the leak". You get tidy books and a clunky job experience.

Zoho Invoice

Worth knowing about because the core invoicing is free for low volume. If you're a solo plumber doing a small number of invoices a month and you just want something better than a Word template, it's hard to argue with free. It's not trade specific and it won't grow into job management, but as a starting point it does the job.

A worked example: what same-day invoicing is actually worth

Numbers make this real. Say you're a solo plumber turning over around £80,000 a year, which is roughly £6,600 a month in invoices. Take a typical month of work.

• Average invoice: £450
• Invoices a month: about 15
• Old way (paper pad, invoice sent the following weekend): average 9 day gap between finishing the job and the invoice landing
• App way (invoice sent from the driveway): average 0 to 1 day gap

That's roughly 8 days of delay removed from every job before the customer even starts their own payment clock. On a paper-pad month, a chunk of that £6,600 is still sat unbilled at month end. On an app month, almost all of it is billed and most of it is paid.

Run it forward. If same-day invoicing pulls your average payment time in by even a week across £6,600 of monthly work, you're holding roughly £1,500 to £2,000 more cash in your account at any given moment. For a tool costing £25 to £35 a month, that's not a close call. The app pays for itself on the first invoice you'd otherwise have left until Sunday.

And that's before you count the evenings back. My Leeds mate reckons he's got two hours a week of his life back since the invoicing stopped being a weekend job. Two hours a week is a hundred hours a year. Put your own day rate on that.

What to look for in a plumber's invoice app

Strip away the marketing and there are five things that actually matter day to day. Judge any app on these.

• Speed from the phone. Can you raise and send an invoice from the customer's drive in under a minute, one handed, signal permitting? If it needs a laptop, it'll get left until later, and later is where money goes to die.
• A pay-now option on the invoice. Card link or bank link on the invoice itself. Removes the friction between the customer deciding to pay and actually paying.
• VAT done right. If you're VAT registered, the app needs to handle standard, reduced and zero rates cleanly, and the Domestic Reverse Charge if you do work for other VAT registered contractors. Get this wrong and HMRC notices.
• Quote to invoice in one move. Turning an accepted quote straight into an invoice without retyping everything saves real time and stops the "wait, what did I quote" mistakes.
• It survives a Self Assessment. When January comes, you want last year's invoices in one place you can export, not scattered across a notebook and a phone gallery. Whatever you use, make sure HMRC could see a clean trail.

Notice that "most features" isn't on the list. A plumber doesn't get paid faster because the app has a Gantt chart. He gets paid faster because the invoice went out today.

So which one is best?

Here's the straight answer, by who you are.

Solo plumber, watching the pennies: start with Zoho Invoice free, or go to TradeStash if you want trade-specific quoting and the job record in the same place from day one. Either gets you off the paper pad.

Solo or small firm wanting one trade app for everything: TradeStash or Powered Now. Both are built for UK trades, both handle the job and the invoice together, both are sensibly priced for one or two users.

Growing firm, multiple vans: Tradify or Powered Now. The scheduling and team side starts to matter as much as the invoicing, and these are built for it.

Accountant-led, books are the priority: QuickBooks or Xero, and accept the slightly clunky job experience as the price of clean books and easy Making Tax Digital.

There's no two ways about it: the worst choice is staying on the paper pad because picking is a faff. Any of these beats that.

What NOT to do

1. Don't buy on feature count. A long list of features you'll never open is just a higher monthly bill. Buy for the three or four things you'll do every single day.
2. Don't pick the app your accountant likes if you'll never open it. The fanciest accounting package is useless if it lives on a laptop you never get out. An app you actually use beats a better app you don't.
3. Don't ignore the VAT handling. If you're VAT registered, test how the app deals with reduced rate and the Domestic Reverse Charge before you commit. Fixing it later, mid year, is a headache. If you're unsure on the rules, gov.uk has the builder VAT guidance.
4. Don't skip the free trial. Every decent option here lets you try it free. Run a real week of your actual jobs through it before you pay. The one that feels right in the van is the right one, and you can only tell by using it.
5. Don't let the app become the new excuse. The app doesn't invoice for you. It makes invoicing a 30 second job so there's no reason to leave it. Send it the day the job finishes, every time. That habit, not the software, is what gets you paid.

The habit that beats any app

Pick whichever tool fits, but the thing that actually changes your cashflow is sending the invoice the same day the job finishes. Not the weekend. Not when you "do the paperwork". The same day, from the driveway, while the customer is still happy with the work and the boiler is still warm.

Customers pay invoices that arrive while the job is fresh in their mind. Leave it a week and the goodwill cools, the job feels like old news, and your invoice goes to the bottom of their pile. The best invoice app is simply the one that makes same-day invoicing so easy you've got no excuse not to. TradeStash does it in about 30 seconds from the van, but if another app on this list gets you there, use that. The habit is the prize, not the brand.