The average heating & plumbing business is owed over £6200 in unpaid invoices. The right invoicing software stops paperwork from eating your evenings — and stops customers from “forgetting” what they owe you.

This guide compares the best invoicing software for UK heating and plumbing businesses so you have what you need to pick the right one.

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What makes invoicing software actually good for heating & plumbing

Good invoicing software goes beyond just creating the invoice itself. For heating & plumbing businesses, it often needs to sit alongside a gas certificate, link to the right job, capture parts and labour, and ideally collect payment before you’ve left the address.

The criteria worth caring about:

Speed on-site — can you raise an invoice from your phone, or does it need to be done later?
Connected to the job and the certificate — does the invoice know what you fitted, what you tested, and what you certified?
Payment built in — can the customer pay there and then?
MTD-ready — will it push cleanly into your accounting software so your accountant (or yourself) isn’t fishing through paper at year-end?

Now onto the list itself.

Gas Engineer Software (GES) — Best Overall Invoicing Software For Heating & Plumbing Businesses

With GES, the invoice is the natural end of the job. You complete the work on-site, fill in the gas safety certificate or service record, add parts and labour, before putting together an invoice – all in one app.

Existing quotes can be converted directly into invoices too, and for teams with office staff, real-time syncing of job notes and certificates means everyone has the information they need. Unpaid invoices are automatically chased with invoice reminders.

The invoice itself can come with a payment link or QR code to facilitate fast, cheap, and easy payments from your customers, and once it’s issued, it can get synced across to Xero, QuickBooks, or Sage. The benefit of this being you can handle your entire job management workflow in one place whilst keeping your accounts organised, up-to-date, and fully MTD compliant.

Pricing: For invoicing, pricing starts from £23/user/month on the Core plan or £30/user/month for the Pro plan.

All plans include UK-based support and start with a 14-day free trial period with full feature access, no card required. See pricing or the full feature list.

Accounting Software: Xero, Quickbooks, and Sage

All of Xero, Quickbooks, and Sage offer a clean interface, strong mobile experience, and are widely loved by small to large UK businesses.

Their invoicing functionality is best-in-class when viewed in isolation, so these are genuinely good options for any business. However, using them in isolation means giving up on a more heating & plumbing specific workflow: none will connect invoices to jobs, certificates or your diary like a job management platform can.

Where these platforms shine are their integrations with job management software options for gas engineers and plumbers like GES. Invoices you create on one of these systems will sync over to Xero, Quickbooks or Sage, alongside payments and customers.

The result is a streamlined jobs-to-accounts workflow that keeps you organised and on top of your paperwork.

Xero Pricing: starts from £16/month (Ignite plan). Current offer is 80% off your plan for your first 6 months. Checked June 2026. Starts with a 30-day free trial.

Quickbooks Pricing: starts from £10/month, but currently offering 90% off for 6 months (Sole Trader plan, regular price after introductory offer). Checked June 2026. Starts with a 30-day free trial.

Sage Pricing: Pricing upon request, typically starts from £18/month (Accounting Start). Checked June 2026. Free trial available, often paired with a “first 3 months free” promotion.

Learn more about the best accounting software in our comparison article.

Powered Now

A UK-built trades platform that includes invoicing alongside other job admin features. Designed broadly for tradespeople — electricians, builders, decorators, plumbers — rather than for the heating and plumbing trade specifically.

Powered Now has a fully-fledged invoicing system great for trades businesses, and integrates with the accounting software options mentioned above. It also includes SumUp payments to help you get paid faster.

While Powered Now is a solid option for multi-trade businesses, it lacks some of the more heating & plumbing specific features. Read a side-by-side comparison of Powered Now and Gas Engineer Software.

Pricing: From £28 per month with a 14-day free trial available.

BigChange

An enterprise-grade field service platform aimed at larger fleets, with invoicing as one feature within a much wider back-office system. BigChange integrates with Xero and Sage, and helps facilitate the payment process for customers.

The trade-off is fit. BigChange is built for businesses with vehicles, dispatchers and back-office staff coordinating engineers from a central office — closer to commercial M&E contractors than to a sole trader or a small plumbing team. The invoicing feature is capable, but the rest of the platform is overkill for most heating and plumbing businesses, and the price reflects it.

Pricing: From £79.95/per license monthly.

Tradify

A cross-trade job management platform originally built in New Zealand, now used by UK trades.

Tradify invoicing is very capable and includes invoice reminders, credit card payments, and more. However, heating and plumbing-specific pieces — gas certificates, service records, landlord paperwork — aren’t part of the core. If your business runs on those documents, you’ll either bolt on another tool or live with workarounds. Read more about Tradify vs Gas Engineer Software.

Pricing: Lite £34/user/month (1–3 users), Pro £37/user/month (4+ users). 14-day free trial.

At-a-glance comparison

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Platform	Built for heating & plumbing	Job management features	UK-based support	Payment links	MTD via Xero/QB/Sage	Pricing (from)
Gas Engineer Software	Yes	Yes — heating & plumbing-specific	Yes (UK HQ)	Yes (Crezco)	Yes — pushes to all three	£18/user/mo
Xero/QuickBooks/Sage	No	No — accounting-first	UK team, NZ HQ	Available	Native	Varies
Powered Now	No — trades-generic	Yes	Yes (UK)	Available	Via integration	£28/mo
BigChange	No — enterprise field service	Yes	Yes (UK HQ)	Available	Via integration	Quote only (~£80/user+)
Tradify	No — trades-generic	Yes	UK team, NZ HQ	Available	Via integration	£28/user/mo

All prices ex VAT and accurate as of June 2026. Subject to change — check vendor sites for current offers.

How to choose – questions to ask yourself

The right pick depends less on features and more on a few honest questions about your business.

Are you squarely focused on heating and plumbing? If most of your week is services, breakdowns, gas safety certs and landlord work, you need software that understands those documents — not a generic trades or accounting tool you have to bend into shape.
Are you spending evenings sending and chasing invoices? If the bottleneck is paperwork after the job rather than the job itself, prioritise on-site invoicing and built-in payment links over fancier reporting features.
What does your accountant already use? Whatever invoicing tool you pick, your books still end up in Xero, QuickBooks or Sage. Save yourself a fight by making sure the two talk to each other cleanly.
How many engineers will be raising invoices? A sole trader can get away with a simpler setup. Once you’ve got two or more engineers in the field, you want everyone in one system so nothing falls through the cracks and the office can see what’s outstanding in real time.
Do you want to be paid on the day? If yes, look for payment links and bank-transfer collection built into the invoice itself
Is your business mostly in the UK? UK-based support, UK pricing without FX surprises, and a platform that understands gas regulations and MTD rules will save real friction.