Heating Engineer Invoice Template
Heating work ranges from a quick boiler service to a multi-day installation, and the invoice needs to handle both without confusion. A clear document gets you paid faster: the customer can see exactly what was done, what was supplied and what they owe, without ringing you to ask. This template keeps the layout simple, with itemised labour and materials, a stated due date and a sequential invoice number so your records stay tidy for the accountant and for HMRC.
On installation jobs, break the invoice down the same way the quote was broken down: the boiler supplied, flue components and any plume kit, the magnetic filter and flush, controls such as a smart thermostat or TRVs, and the radiators fitted. Referencing the original quote number helps the customer match the two documents. For service visits, list the annual service as its own line at the agreed price, separate from any parts you fitted on top, and for landlords record the CP12 gas safety certificate as a distinct line so their compliance file stays in order. If you are VAT registered, show the VAT clearly; if the job included unvented cylinder work covered by your G3 qualification, noting the Benchmark entry is a professional touch.
Set the payment due date in plain figures (14 days from invoice is common for domestic work), give your bank details and ask the customer to use the invoice number as the transfer reference, which saves awkward matching later. Download the template in Word or PDF, or build the invoice online.
What to include in a heating engineer invoice
- Your business details, Gas Safe registration number and VAT number if registered
- Customer name and address, plus the site address if different
- Sequential invoice number, invoice date and the original quote reference
- Description of work: installation, service, repair or CP12 certificate
- Itemised labour and materials: boiler, flue parts, filter, controls, radiators
- Annual service listed as a separate line, with next service date noted
- Payment due date (14 days is common for domestic customers)
- Bank transfer details with the invoice number as the payment reference
- Total, VAT breakdown if applicable, and any deposit already paid
Download the template
Or build it online, free
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Open the invoice generatorHeating engineer invoice FAQs
What payment terms should a heating engineer put on an invoice?
Fourteen days is common for domestic customers, and many engineers ask for payment on completion for smaller jobs such as services. Landlords and letting agents often work to 30 days, so agree that before the work starts. Whatever you choose, print the actual due date on the invoice, not just the wording.
How should I invoice an annual boiler service?
Put the service on its own line at the agreed fixed price, separate from any parts or extra repairs found during the visit. Note the appliance serviced and the date, and add a line recording when the next service falls due. That one line turns a single invoice into repeat work every year.
How do I chase a late payment without souring the relationship?
Start with a polite reminder the day after the due date: resend the invoice, quote the invoice number and amount, and ask when payment is expected. Most late payments are oversight, not refusal. If there is still nothing after a week, follow up by phone, then send a firmer final notice before considering anything formal.
Can I edit the heating engineer invoice template?
Yes. Download the Word version to change the wording, add your logo and adjust the sections, or use the free online invoice generator to build the same document in your browser and save it as a PDF.