Standard gas combi service, most of the UK
Realistic average for a straightforward gas boiler
Big national brands and London cost more
Single appliance gas safety certificate
How much does boiler service cost in 2026?
Boiler service prices in 2026 depend mainly on who does the work, where you live, your boiler type and whether you bundle in a gas safety certificate. Local independent Gas Safe engineers are usually the cheapest; national brands and energy companies sit at the top end. The table below shows typical 2026 UK figures.
| Service type | Typical 2026 range | Notes |
|---|---|---|
| Gas combi boiler service (local engineer) | £70–£100 | Most common job; cheapest route |
| Gas boiler service (national brand) | £99–£150 | e.g. energy-company one-off visits |
| Oil boiler service | £90–£140 | Extra steps vs gas; fewer engineers |
| Electric boiler service | £75–£110 | No combustion check needed |
| Heat pump service | £150–£250 | Specialist; different from gas service |
| Landlord CP12 (single appliance) | £60–£90 | +£10–£20 per extra appliance |
| Combined service + CP12 | £110–£140 | Saves £30–£50 vs booking separately |
| Boiler & heating cover plan | £100–£300/yr | Roughly £8–£25 per month |
What affects the cost
Several factors move a boiler service from the bottom of the range to the top:
- Who you book: a local Gas Safe engineer typically charges £70–£100, while national brands and energy companies sit closer to £100–£150 for the same work.
- Location: London and the South East are the priciest (£100–£150); the North East, Scotland and Wales tend to be cheaper (£65–£110).
- Boiler type: gas combis are cheapest, oil boilers cost more, and heat pumps need a specialist.
- Add-ons: a CP12 certificate, multiple appliances, or any parts and repairs found during the visit all add to the bill.
Why service your boiler every year
There are three solid reasons to service annually — and they usually outweigh the modest cost:
- Safety: a Gas Safe engineer checks for gas leaks, correct combustion and the risk of carbon monoxide, which is colourless and odourless.
- Efficiency: a clean, well-tuned boiler burns less fuel, which matters when energy prices remain high in 2026 — a neglected boiler quietly costs you more every month.
- Warranty: most manufacturers require a documented annual service by a Gas Safe engineer. Skip it and you can invalidate the guarantee, leaving you exposed to a four-figure repair or replacement.
A well-maintained boiler also tends to last years longer than one that's never touched.
What's checked during a service
A proper service is more than a quick glance. A Gas Safe engineer will typically:
- Run a flue gas analysis to confirm the boiler is burning fuel safely and correctly.
- Visually inspect for leaks, corrosion and damage to pipework and seals.
- Check the ventilation and flue are clear and unobstructed.
- Test and adjust the boiler pressure and key controls.
- Clean filters and internal components where needed.
- Confirm there is no risk of carbon monoxide escaping.
A service is not the same as a CP12 gas safety check, though the two overlap and are often done in one visit.
Service, cover plan or CP12 — which do you need?
These three things sound similar but are different products:
- One-off service (£70–£120): a single annual visit. Best value if your boiler is newer (under 7 years) and reliable.
- Cover plan (£8–£25/month, roughly £100–£300/year): includes a service plus breakdown repairs. Worth it for older boilers (7–15 years) where the breakdown risk is higher, but it costs more than a one-off if nothing goes wrong.
- Landlord CP12 (£60–£90): a legally required annual gas safety certificate for rented homes. It checks safety but is not a full service — landlords should ask for both.
Common extras and hidden costs
The headline price covers the service itself. Watch out for:
- Parts and repairs: if the engineer finds a faulty part, that's charged on top — always ask before they proceed.
- Extra appliances: a CP12 adds £10–£20 per additional gas appliance such as a hob or gas fire.
- Call-out or travel fees: some firms add these for rural or out-of-area properties.
- Power flush: not part of a standard service; a separate job costing £300–£700 if your system is sludged up.
How to save money without cutting corners
You can trim the cost while keeping everything safe and warranty-compliant:
- Use a local independent Gas Safe engineer rather than a national brand for the same legally-required work.
- Book in late spring or summer, when engineers are quieter and sometimes discount.
- Landlords: always bundle the service and CP12 into one visit to save £30–£50.
- Get two or three quotes and compare what's actually included.
- Keep your service records — they protect your warranty and lift resale value.
Regional price differences (2026)
Boiler service prices vary noticeably by region in 2026, driven by labour rates and travel times. London and the South East are dearest; the North, Scotland and Wales are cheaper.
| Region | Typical 2026 range |
|---|---|
| London | £100–£150 |
| South East | £90–£140 |
| Midlands | £75–£115 |
| North of England | £65–£110 |
| Scotland & Wales | £65–£110 |
Cost estimator
Estimate your likely 2026 boiler service cost based on boiler type, location and whether you need a CP12.
This estimate is a budgeting tool, not a quote. Real prices vary — get local quotes for an accurate figure.
Get real quotesHow to save money
- Choose a local Gas Safe engineer over a national brand for the same work at a lower price.
- Book your service in late spring or summer when demand is low.
- Landlords: combine the boiler service and CP12 in one visit to save £30–£50.
- Get two or three quotes and check exactly what each includes.
- Keep every service record to protect your manufacturer's warranty.
- For a newer, reliable boiler, a one-off service usually beats a cover plan on cost.
- Ask for the price of any parts before the engineer fits them.
How long it takes
- A standard service takes 30–60 minutes for a typical gas combi.
- Older or oil boilers can take a little longer.
- A combined service plus CP12 is usually done in a single visit.
- Book your service annually, ideally before the winter heating season.
What's usually included
- Flue gas analysis to confirm safe combustion
- Visual inspection of pipework, seals and the boiler casing
- Ventilation and flue checks
- Boiler pressure test and controls check
- Cleaning of filters and key components
- Carbon monoxide safety check
What's usually extra
- Replacement parts and repairs found during the service
- Power flushing a sludged-up system
- Extra gas appliances on a CP12 (charged per appliance)
- Breakdown repairs (covered by a cover plan, not a one-off service)
- Call-out or travel fees for some rural properties
How to choose the right heating engineers
By law, any business working on a gas boiler in the UK must be on the Gas Safe Register — never let an unregistered tradesperson touch your gas appliances. Always check the engineer's Gas Safe ID card before work begins.
- Are you Gas Safe registered, and can I see your ID card?
- Is the price for a full service, a CP12, or both?
- What exactly does your service include?
- Will you provide a written service record afterwards?
- Are parts and repairs charged separately, and will you quote before fitting?
- Do you charge a call-out or travel fee?
- Can you supply references or reviews from local customers?
- Does my service meet my boiler manufacturer's warranty conditions?
Boiler service cost FAQs
How much does a boiler service cost in 2026?
Most UK homeowners pay £70–£120 for a one-off gas boiler service, with around £100 being a realistic average. London and the South East run higher at £100–£150, while local independent engineers can be £70–£100.
How often should I service my boiler?
Once a year. Annual servicing keeps your boiler safe and efficient and is usually required to keep the manufacturer's warranty valid.
Is a boiler service the same as a gas safety certificate (CP12)?
No. A CP12 is a legal safety check for landlords, while a service is a fuller clean and tune-up. They overlap and are often combined in one visit, but they are separate products.
How much is a landlord CP12 in 2026?
Typically £60–£90 for a single appliance, plus around £10–£20 for each extra gas appliance such as a hob or gas fire. A standard property with several appliances often lands at £80–£120.
Can I get a combined service and CP12?
Yes. Most engineers offer a combined service plus CP12 for £110–£140, saving roughly £30–£50 versus booking them separately. For landlords it's the sensible choice.
Is a boiler cover plan better than a one-off service?
It depends on your boiler's age. For newer boilers (under 7 years) a one-off service at £70–£120 is usually better value. For boilers aged 7–15 years, a cover plan at £8–£25/month can be worth it because breakdown risk rises.
Will skipping a service void my warranty?
Often, yes. Most manufacturers require a documented annual service by a Gas Safe engineer. Miss it and you can invalidate the guarantee, leaving you to pay for any repair or replacement yourself.
Why is an annual service worth it?
Three reasons: safety (checks for gas leaks and carbon monoxide), efficiency (a clean boiler burns less fuel and lowers bills), and warranty protection. A well-maintained boiler also lasts longer.
Who is legally allowed to service my gas boiler?
Only a Gas Safe registered business. By law all gas engineers in the UK must be on the Gas Safe Register — always check the engineer's ID card before they start.
How long does a boiler service take?
A standard gas combi service takes 30–60 minutes. Older or oil boilers can take longer, and a combined service plus CP12 is still usually completed in one visit.