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Annual Gas-Safe service — flue gas check, seals, pressure and a printed report for warranty.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Skipping service
— warranty void; safety risk; bigger bills later.
Self-employed pretending to be Gas Safe
— verify ID at gassaferegister.co.uk.
Service without paperwork
— get the service certificate.
Quick "check" not a service
— proper service takes 45+ minutes.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Standard combi serviceSingle visit
£80–£140
System boiler serviceInc. cylinder check
£100–£180
Landlord gas safety + serviceInc. CP12
£100–£160
Service contract (annual)Inc. callouts during year
£120–£250
British Gas HomeCare-style coverInc. labour cover
£200–£500
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
Infographic · VideoThe Boiler Engineer briefing.
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Video guide
Boiler Engineer explained
Annual boiler servicing is mandatory for maintaining warranty, recommended for safety, and almost certainly profitable in the long run (catching small issues before they become big). This guide covers what UK boiler servicing actually involves in 2026, the cost, and why skipping it is a false economy.
What's Included in a Service?
- Visual inspection of boiler, flue, and pipework.
- Cleaning of internal components.
- Combustion analysis (flue gas testing for CO).
- Pressure testing of gas connections.
- Heat exchanger condition check.
- Burner clean and check.
- Diverter valve / 3-port valve check.
- Expansion vessel check (especially pressure).
- Magnetic filter clean if fitted.
- Issue service certificate.
Typical Costs
| Type | Low £ | High £ | Notes |
|---|---|---|---|
| Standard combi service | 80 | 140 | Single visit |
| System boiler service | 100 | 180 | Inc. cylinder check |
| Landlord gas safety + service | 100 | 160 | Inc. CP12 |
| Service contract (annual) | 120 | 250 | Inc. callouts during year |
| British Gas HomeCare-style cover | 200 | 500 | Inc. labour cover |
How Long Does It Take?
- Typical service: 45-60 minutes.
- Plus 15 minutes paperwork.
UK Regulations
- Gas Safe install required for any service work.
- Landlord gas safety: annual certificate (CP12) legally required.
- Warranty: most manufacturers void warranty without annual service.
Common Problems
- Skipping service — warranty void; safety risk; bigger bills later.
- Self-employed pretending to be Gas Safe — verify ID at gassaferegister.co.uk.
- Service without paperwork — get the service certificate.
- Quick "check" not a service — proper service takes 45+ minutes.
Frequently Asked Questions
Do I really need an annual service?
Yes — warranty depends on it, safety depends on it, and small issues caught early save money.
What's the best time of year?
Late summer/early autumn — engineers less busy, issues found before winter use.
Should I get a service contract?
Worth considering for older boilers. Standard contracts include annual service + some callout cover.
What's a CP12?
Landlord Gas Safety Record — annual mandatory certificate for rental properties.
Can I service my own boiler?
No — gas work requires Gas Safe Registration. Illegal otherwise.
Will service void if missed?
Manufacturer can refuse warranty claim if service not done annually. Document each service in writing.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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