Best Software for Small Plumbing Businesses in the UK: Quoting, Gas Safe Certs and Invoicing in One Place

You’re under a boiler at 4pm, you’ve got three quotes to send, a CP12 due on a rental property by Friday, and an invoice from six weeks ago that’s still sat unpaid. Sound about right?

That’s the week for most small plumbing businesses in the UK — one or two vans, no office admin, no back-office. You’re the plumber, the quoter, the certifier, and the credit control department. Something always slips, and it’s usually the paperwork, because paperwork doesn’t call you shouting about a burst pipe.

So when people search for the best software for small plumbing business UK setups, what they’re actually after isn’t a fancier calendar. It’s one place that handles quoting, Gas Safe certification and invoicing without you re-typing the same job three times into three different apps. Let’s get into what that actually looks like.

What “best software for small plumbing business UK” should actually mean

A lot of plumbing software UK listings are really just job-scheduling apps with a certificate bolted on as an afterthought. That’s backwards. For a plumbing business, compliance isn’t a nice-to-have feature — it’s the thing that keeps you working legally. Gas Safe registration and CP12 landlord gas safety certificates aren’t paperwork for paperwork’s sake; miss one and you’re not just behind on admin, you’re exposed.

So the bar for decent plumbing software should be:

• Quoting that turns a callout into a proper Good/Better/Best estimate in minutes, not a WhatsApp voice note you’ll “type up later”
• Certification that produces a compliant CP12 or gas safety record tied to the actual job, not a separate PDF you have to file yourself
• Invoicing that goes out the moment the job’s marked complete — and chases itself if it goes unpaid
• All three talking to each other, so a quote becomes a job becomes a certificate becomes an invoice without you touching a keyboard four times

That’s the whole point of running one system instead of three. Every time you copy a customer’s details from your quoting app into your certificate software into your invoicing app, that’s fifteen minutes you’re not billing for — and a chance to fat-finger a postcode.

The compliance bit nobody can skip: Gas Safe and CP12

If you’re Gas Safe registered and doing boiler work, landlord safety checks, or servicing, your CP12s aren’t optional admin — they’re the legal record that you did the check and the property’s safe. We covered the detail of what’s actually required in our guide to CP12 landlord gas safety certificates, but the short version for software purposes is this: your certificate needs to be generated from the job, not from memory three days later when the letting agent chases you.

There are dedicated certification tools built specifically for this. Clik Compliance is aimed squarely at electrical, gas, fire and HVAC contractors who need regulated certificates — entry tier runs £20/user/month for 5 templates and up to 30 certificates a month, moving to £25/user/month for 12 templates and 80 certificates on the Advanced plan. That’s a solid option if certification is genuinely your whole business model and you’re churning out dozens of certs a month across a team.

But for most small plumbing outfits — one to five vans, doing gas safety checks alongside general plumbing, bathroom fits, and emergency callouts — paying per user for a standalone certificate tool on top of separate quoting and invoicing software adds up fast. Three vans on Clik Compliance’s Advanced tier is £75/month before you’ve quoted a single job or sent an invoice.

We compared the dedicated-cert-app route against an all-in-one approach in our piece on Gas Safety Certificate Software vs standalone CP12 apps, and the honest answer is: standalone certificate software is genuinely good at one thing. It’s just one more login, one more monthly bill, and one more place your customer’s job history lives separately from their invoice history.

Quoting: stop losing jobs to slow replies

Here’s a scenario every plumber’s lived through. Customer calls about a new combi boiler install, or a full bathroom refit. You go round, have a look, say “I’ll send you a quote.” Three days later they’ve booked someone else — because that someone else replied same-day with three clear price options.

Quoting speed wins jobs. Full stop. A customer comparing plumbers on price and trust is going to lean toward whoever made the decision easy, and a scrappy handwritten estimate on the back of an invoice pad doesn’t do that.

This is where Hero AI — Hero365’s always-on AI teammate — earns its keep. You record a 60-second voice note walking through what the job needs (new unvented cylinder, two-zone valve, whatever it is) and Hero AI drafts a Good/Better/Best estimate from it in under a minute, ready to send. No sitting at the kitchen table at 9pm typing out line items. We’ve written before about how an AI dispatcher fills same-day emergency slots — quoting works the same way: speed is the product.

Invoicing software for tradesmen: getting paid without chasing

Ask any plumber what their least favourite job is and it’s rarely the job itself — it’s the phone call three weeks later asking a customer why the invoice hasn’t been paid. Awkward, time-consuming, and it’s not why you got your Gas Safe card.

Decent invoicing software for tradesmen should raise the invoice automatically when the job’s marked done, send it straight to the customer, and — this is the part most tools skip — actually chase it if it goes overdue. Hero AI does exactly that: it chases overdue invoices, reconciles payments as they land, and keeps your books tidy without you drafting a single “just following up” email. CIS deductions on subcontracted labour get logged correctly too, so you’re not untangling that at year-end with your accountant.

Comparing the field: what actually fits a small plumbing outfit

Here’s how the UK options for small plumbing shops stack up on the three jobs that matter — quoting, certification, and invoicing, all working from one job record.

	Quoting built in	Gas Safe/CP12 certs	Invoicing + chasing	Cost for a 2-van shop
Hero365 (Hero AI)	✅ Voice-note to estimate	✅	✅ Auto-chases overdue	From £19.99/mo (AI Concierge)
Tradify	✅	❌ (not its focus)	✅	£34-44/user/month
Clik Compliance	❌	✅ Purpose-built certs	❌	£20-25/user/month (certs only)
EasyCert	❌	✅ (BS 7671/5839/5266)	❌	£174.95-£224.95 one-off
Commusoft	✅	✅	✅	Quote-only
ServiceM8	✅	❌	✅	Quote-only

Tradify’s a capable job management app for quotes and invoices, but at £34-44 per user per month, a two-man plumbing outfit is looking at £68-88/month before you’ve added any certification tool on top — and Gas Safe certs aren’t Tradify’s focus at all. EasyCert is the opposite trade-off: a proper one-off licence (£174.95 for Pro, £224.95 for Mobile) if you just want a desktop certificate generator and nothing else, but it doesn’t touch quoting or invoicing, so you’re still running two other bits of software alongside it.

For a small plumbing business that wants quoting, compliance, and getting paid handled by one AI teammate instead of three separate subscriptions, Hero365’s pricing starts at £19.99/month for the AI Concierge tier — no per-user fee, no quote-only mystery pricing, no separate certificate login.

Picture the week this actually fixes

Monday morning, a landlord calls about a CP12 renewal on a rental. Hero AI answers the call (even if you’re up a ladder), books the slot straight onto your day, and routes it in with your other jobs so you’re not driving across town twice. You do the check, the certificate’s generated from the job record — no separate app, no re-entering the tenant’s address. Invoice goes out the same afternoon. Three weeks later, if the letting agent’s dragging their feet on payment, Hero AI’s already chasing it — politely, consistently — while you’re getting on with the next boiler.

That’s the shift. Not more software. Less of it, doing more.

If you’re tired of quoting in one app, certifying in another, and invoicing in a third, download the Hero365 app and hire Hero AI to run the back office while you run the tools. Or have a look at how it handles the parts that cost you the most time with our free tools — worth five minutes before your next job.