A heating engineer invoice should identify the property, appliance or system, work completed, parts supplied, test or commissioning record and payment due. Use this UK template for servicing, repairs and installations in 2026.
This is general information, not tax advice. Use the correct VAT and CIS treatment for the job.
Heating engineer invoice template
Supplier: [Legal business name, address, company number and VAT number]
Customer: [Name and billing address]
Property: [Work address]
Job/quote: [Reference]
Invoice number: [Unique number]
Invoice date: [Date]
Work date: [Date or period]
Due date: [Date]
| Description | Amount |
|---|---|
| Call-out and diagnosis | £[ ] |
| Labour: [repair/service/installation] | £[ ] |
| Parts: [make, model or description] | £[ ] |
| Testing and commissioning | £[ ] |
| Subtotal | £[ ] |
| VAT [treatment] | £[ ] |
| Amount due | £[ ] |
Appliance/system: [Make, model and location]
Record attached: [Service, commissioning, warranty or safety document]
Service invoice example
| Description | Amount |
|---|---|
| Annual boiler service: Worcester Greenstar, kitchen | £95 |
| Replace burner seal | £24 |
| Combustion checks and service record | Included |
| Subtotal | £119 |
| VAT at 20% | £23.80 |
| Amount due | £142.80 |
The appliance and property make the invoice traceable when a landlord owns several sites.
Repair work
Describe the reported fault, diagnosis and action. “Heating repair” is weak. “Diagnose loss of pressure; replace automatic air vent; refill, bleed and test system” records the result.
Separate parts from labour. Attach photographs or a signed worksheet where the customer requires evidence.
Installation and stage payments
For boilers, cylinders or heating systems, link the invoice to the accepted quote. Show deposits and prior stages separately.
A practical sequence can be deposit, equipment on site, installation complete, and commissioning/handover. Use the stage payment template to show the balance remaining.
Landlords and agents
Include the property address, landlord or work-order reference, appliance details and attached record. Send the invoice to the nominated accounts address rather than only to the tenant or site contact.
VAT and CIS
Direct domestic servicing is not a CIS invoice merely because it is trade work. Installation under a construction subcontract may fall within CIS. The contractor verifies the treatment.
When CIS applies, split labour and qualifying materials. The CIS invoice template shows the deduction and net due.
The VAT domestic reverse charge has separate conditions. Check it rather than applying it automatically.
Final check
- Is the legal customer correct?
- Is the property and appliance identified?
- Are labour and parts separate?
- Is the service or commissioning reference shown?
- Are deposits and previous payments deducted?
- Is VAT or CIS treatment correct?
- Is the actual due date printed?
- Are promised records attached?
Sendinvo handles quotes, invoices, deposits, attachments and reminders. Start free to send the invoice with the job details still to hand.