An annual boiler service in London costs £85 plus any parts with Boiler Installer London. That price covers a full safety and performance check by a Gas Safe registered engineer, and you get a written service record afterwards. Across the UK, Which? reports a one-off gas boiler service usually costs between £70 and £110, and London quotes often sit at the higher end because of local labour and parking costs.
The service fee is fixed. The only extras are parts, and we tell you about those before any work starts. You can book an annual boiler service in London online in a few minutes.
How Much Does a Boiler Service Cost in London in 2026?
Most Londoners pay between about £70 and £110 or more for a gas boiler service, depending on the company and the boiler. Our price is £85 for the service itself. Parts are quoted separately.
Here is how our pricing works:
| Item | Cost |
|---|---|
| Annual boiler service (labour and checks) | £85 |
| Replacement parts, if needed | Quoted separately before work begins |
| Repairs found during the visit | Quoted separately after inspection |
| Service and landlord gas safety certificate together | Confirm the combined price when booking |
The £85 is our price. It is not a claim that every London engineer charges the same. Prices vary by company, boiler type and how old the boiler is, so always ask what is included before you book.
What should you expect to pay for a cheap service?
If a quote is far below the typical range, ask why. A very low headline price can mean a quick look instead of a full service, or extra charges added on the day. A fair price should come with a clear list of checks and a written record.
What Is Included in an Annual Boiler Service?
A proper annual service is a full check of how your boiler runs and whether it is safe, not just a quick glance. The engineer inspects the boiler, tests its safety features and records the results.
A typical service covers these steps:
- Visual inspection. The engineer checks the boiler, pipework and surrounding area for leaks, corrosion or damage.
- Casing removed and internal check. They inspect key parts such as the burner, heat exchanger and seals.
- Flue check. The flue carries waste gases outside. The engineer makes sure it is sound and clear.
- Gas pressure and combustion test. A flue gas analyser measures how cleanly the boiler burns fuel.
- Safety controls test. The engineer confirms safety devices shut the boiler off when they should.
- Condensate pipe check. On condensing boilers, a blocked condensate pipe is a common winter fault.
- Written service record. You receive proof of what was checked and any issues found.
Does the service include cleaning?
A standard service includes cleaning of accessible components as part of the visit. A deep clean, such as a full system flush, is a separate job and costs extra. Ask before booking if your heating has cold spots or noisy pipes.
Does the service include repairs?
No. A service finds problems. A repair fixes them. If the engineer spots a worn part, they explain it, give you a price and wait for your approval.
What Can Make a Boiler Service Cost More?
The service fee stays the same, but parts, repairs and extra work can add to the final bill. Here are the main things that raise the cost:
- Replacement parts. Items such as a faulty pump, valve or seal are charged on top of the service fee.
- Repairs. Fixing a fault is a separate job from the annual check.
- Older or neglected boilers. A boiler that has not been serviced for years may need extra cleaning or more time.
- Extra work outside the standard service. A powerflush or magnetic filter fitting is quoted separately.
- Out-of-hours visits. Evening, weekend and same-day bookings can cost more with some companies.
Real-world example: A homeowner in a two-bed London flat books a service in October. The engineer completes every check and finds the condensate pipe is partly blocked and a seal is worn. The service fee is £85. The seal is quoted as a separate part cost, and the homeowner approves it before the engineer fits it. Nothing is added without a yes.
Does Boiler Type Affect the Price?
It can, depending on the company. Combi, system and regular boilers have different layouts, so some firms charge slightly different prices for each.
| Boiler type | How it works | Service notes |
|---|---|---|
| Combi boiler | Heats water on demand, no tank | Most common in London flats and small homes |
| System boiler | Works with a hot water cylinder | Cylinder and controls are checked too |
| Regular (conventional) boiler | Uses a tank in the loft and a cylinder | More components, so checks can take longer |
Ask your engineer whether the same £85 price applies to your boiler type when you book.
Boiler Service vs Gas Safety Certificate: What Is the Difference?
A boiler service and a landlord gas safety check are two different things. They are often confused, and the difference matters for rented properties.
- A boiler service is maintenance. It checks that your boiler works well and safely, and it helps keep your manufacturer’s warranty valid.
- A landlord gas safety check (CP12) is a legal safety inspection of every gas appliance in a rented property. The result is a Landlord Gas Safety Record.
According to the Health and Safety Executive (HSE), landlords must arrange a gas safety check every 12 months, and they must keep appliances in safe working order. A service on its own does not replace that check.
Can you book both together? Often yes. Many engineers combine the two in one visit, which saves time. Confirm the combined price before you book.
Is an Annual Boiler Service a Legal Requirement?
For homeowners, no. For landlords, a yearly gas safety check is a legal duty. Homeowners are not legally required to service their boiler, but many manufacturers require an annual service to keep the warranty valid. Check your warranty paperwork to be sure.
Is an Annual Boiler Service Worth the Cost?
For most households, yes. An annual service will not stop every breakdown, but it gives you several clear benefits:
- Safety. The engineer checks for gas and flue problems that could put carbon monoxide into your home.
- Early warning. Worn parts are often spotted before they fail on a cold night.
- Warranty protection. Many manufacturers ask for proof of yearly servicing.
- Efficiency. A boiler that burns cleanly wastes less fuel.
- Peace of mind. You get a written record of your boiler’s condition.
At £85, the service costs far less than most emergency call-outs, and you avoid being without heating in winter.
When Is the Best Time to Book a Boiler Service in London?
Autumn is the most popular time, but any time of year works. Engineers get busy from October to December, so booking in late summer or early autumn gives you more choice of dates. Spring and summer are quieter, and appointments are often easier to find.
If you want to avoid the winter rush, pick a month when you are not relying on your heating.
How to Choose a Boiler Service in London: 6 Steps
- Check Gas Safe registration. Ask for the engineer’s ID card and verify it on the Gas Safe Register.
- Ask what is included. Get the list of checks in writing.
- Ask about parts and extra charges. A good company explains how extra work is priced.
- Confirm the approval process. You should approve any extra cost before work begins.
- Ask for a written service record. This is useful proof for warranties and landlords.
- Read genuine reviews. Look for recent, detailed feedback from London customers.
Annual Boiler Servicing Across London
Our engineers cover Central, North, South, East and West London. Whether you live in a flat, a terraced house or a rented property, you can book a service for your postcode. Check our local service pages for your area.
Frequently Asked Questions
1. How much does an annual boiler service cost in London?
An annual boiler service in London typically costs £70 to £110 or more. At Boiler Installer London, the price is £85 plus parts, with a written service record included.
2. Does the £85 price include parts?
No. The £85 covers the engineer’s time and the full service checks. If a part needs replacing, we quote it separately and wait for your approval.
3. How long does a boiler service take?
Most services take 45 minutes to an hour. Older boilers or ones with faults can take longer.
4. How often should a gas boiler be serviced?
Once every 12 months. Many manufacturers require this to keep the warranty valid.
5. Is a boiler service a legal requirement for homeowners?
No. Homeowners are not legally required to service their boiler, but it is strongly recommended for safety and warranty reasons. Landlords, however, must arrange an annual gas safety check.
6. Is a boiler service the same as a CP12 certificate?
No. A service is maintenance. A CP12 is a landlord’s gas safety record covering all gas appliances. You can often book both in one visit.
7. What happens if the engineer finds a fault?
The engineer explains the problem, gives you a price for the repair and waits for your approval. Nothing is done without your agreement.
8. Does boiler type change the price?
It can with some companies. Ask your provider whether the same price applies to combi, system and regular boilers before you book.
9. Can I book a service if my boiler is working fine?
Yes, and you should. A working boiler can still have hidden issues, and a yearly check helps catch them early.
10. Does annual servicing keep my boiler warranty valid?
In many cases, yes. Most manufacturers require a yearly service by a Gas Safe registered engineer. Always check your warranty terms, and keep the written service record.
Conclusion: Book Your Annual Boiler Service in London
An annual boiler service in London costs £85 plus parts with us, and it gives you a safety check, early fault detection and a written record for your warranty. Compare what is included, not just the headline price, and always choose a Gas Safe registered engineer.
Ready to book? Book your annual boiler service in London today and get your heating ready for winter.