Cost Guide · Updated July 2026
Boiler Service Cost UK 2026
A standard annual boiler service costs £70–£120 as a one-off in 2026. A landlord gas safety check (CP12) runs £60–£90, and a combined service plus certificate typically lands at £100–£150. Boiler cover plans that bundle the service cost £10–£25 a month.
Get 3 Free Service Quotes →Quick answer: Budget £70–£120 for a one-off annual boiler service from a Gas Safe registered engineer in 2026. Landlords pay £60–£90 for a CP12 gas safety certificate, or £100–£150 for a combined service and certificate. Prices rise 15–30% in London and the South East, and older or non-standard boilers can add £20–£40. Never let an unregistered person touch your gas boiler — it is both dangerous and illegal.
How much does a boiler service cost in 2026?
For a typical UK household in 2026, a one-off annual boiler service costs between £70 and £120. Most Gas Safe registered engineers charge a flat call-out-and-service fee for a standard gas combi or system boiler in good working order, and the job usually takes 30–60 minutes. If your boiler is older, an unusual make, in a hard-to-reach location, or has not been serviced for several years, expect to pay towards the top of that range or a little above it.
The figure you actually pay depends on four things: where you live (London and the South East carry a clear premium), who you book (an independent local engineer is almost always cheaper than a national brand or manufacturer), the boiler type and age, and whether the service is a standalone visit or bundled into a cover plan or a landlord certificate.
| Service type | Typical 2026 cost | What you get |
|---|---|---|
| One-off annual service (standard combi) | £70–£120 | Full Gas Safe inspection & clean-check |
| One-off service (system / regular boiler) | £80–£130 | As above plus cylinder / feed checks |
| Landlord gas safety check (CP12) | £60–£90 | Legal certificate, one appliance |
| CP12 — each additional appliance | +£10–£30 | Extra hob, fire or second boiler |
| Combined service + CP12 | £100–£150 | Service work and certificate together |
| Boiler cover plan (service included) | £10–£25 / month | Annual service + breakdown repairs |
| Manufacturer / warranty-brand service | £99–£180 | Brand engineer, warranty-compliant |
As a rule of thumb, an independent local Gas Safe engineer will be your cheapest route for a straightforward one-off service, while manufacturer visits sit at the top end because they protect a live warranty. If you want to compare like-for-like on price and availability, it pays to get a few quotes side by side rather than accepting the first number you are quoted.
What does a Gas Safe boiler service actually involve?
A proper annual service is more than a quick glance and a sticker. A competent Gas Safe registered engineer follows the boiler manufacturer’s service schedule and carries out a series of safety and performance checks. It is worth knowing what you are paying for, because “services” priced suspiciously low sometimes skip the important steps.
A thorough service should include
- A visual inspection of the boiler, flue and pipework for corrosion, leaks or damage
- Checking the flue terminals inside and outside, and testing flue gases with a flue gas analyser to confirm safe, efficient combustion
- Testing gas pressure and burner pressure against the manufacturer’s specification
- Inspecting the heat exchanger, burner, spark and injectors, and cleaning where required
- Checking seals, the condensate trap and drainage, the expansion vessel and safety devices
- A tightness (gas soundness) test to confirm there are no gas leaks
- Confirming the boiler fires up and cuts out correctly, and that controls work
- A written service record, and — for landlords — a CP12 gas safety certificate
At the end, the engineer should tell you the boiler’s condition, flag any parts nearing the end of their life, and either issue a pass or, if something is unsafe, warn or turn off the appliance and explain why. A clean-and-check is the minimum; a good engineer will also give you honest advice on whether an ageing boiler is worth keeping or whether you are better planning a boiler replacement.
Important: By law, only a Gas Safe registered engineer may work on your gas boiler in the UK. The old CORGI scheme was replaced by the Gas Safe Register in 2009. Always ask to see the engineer’s Gas Safe ID card, check the licence number on the back, and confirm they are qualified for the specific appliance. You can verify any engineer free on the official Gas Safe Register.
One-off service or a boiler cover plan?
You can pay for a service each year as a standalone job, or you can fold it into a boiler cover plan that also covers breakdowns and repairs. Both are valid — the right choice depends on how much peace of mind you want and how old your boiler is.
Paying for a one-off service
A single annual service at £70–£120 is the cheapest way to keep your boiler safe, efficient and warranty-compliant. You pay only for what you need, and you can shop around each year. The downside is that if the boiler breaks down in January, the repair bill is entirely yours — and a new part plus labour can easily run to £150–£500 or more.
Boiler cover plans
Cover plans bundle the annual service with repair callouts, parts and labour for a monthly fee of roughly £10–£25, depending on the level of cover, any excess, and whether controls and central heating are included. Over a year that is £120–£300, so you are effectively pre-paying for the service and insuring against breakdowns.
| One-off annual service | Boiler cover plan | |
|---|---|---|
| Typical 2026 cost | £70–£120 / year | £10–£25 / month (£120–£300 / year) |
| Annual service included | Yes (the service itself) | Yes |
| Breakdown repairs | No — you pay per repair | Yes, usually up to a limit |
| Parts & labour | Charged separately | Included (may carry an excess) |
| Best for | Newer, reliable boilers | Older boilers; peace of mind |
| Freedom to shop around | Every year | Locked to the provider |
If your boiler is under 8 years old and reliable, a one-off service usually works out cheaper. If it is over 10 years old, or you simply don’t want a surprise winter bill, a cover plan can be worth the premium. Just read the small print: some plans have a waiting period, an excess per call, or exclude “pre-existing” faults picked up at the first service.
Boiler service cost by boiler type
The type of boiler you have affects both how long the service takes and how much you pay. The three common types in UK homes are combi, system and regular (conventional / heat-only) boilers.
| Boiler type | Typical service cost | Why |
|---|---|---|
| Combi boiler | £70–£120 | Single unit, no separate cylinder — quickest to service |
| System boiler | £80–£130 | Sealed system with a hot-water cylinder to check |
| Regular / conventional boiler | £80–£140 | Cylinder plus feed & expansion tanks in the loft to inspect |
| Back boiler / older unit | £90–£160 | Harder access, obsolete parts, longer job |
| LPG boiler (off-grid) | £80–£140 | Needs an LPG-qualified Gas Safe engineer |
| Oil-fired boiler | £90–£150 | Needs an OFTEC-registered engineer, not Gas Safe |
A quick note on oil: oil-fired boilers are not covered by the Gas Safe Register — they are serviced by OFTEC-registered engineers instead. If you are off the gas grid on oil or LPG, make sure the engineer holds the right registration for your fuel. For gas boilers, Gas Safe is the only legally recognised scheme.
Boiler service cost by UK region
Where you live has a real effect on price. Labour rates in London and the South East are the highest in the country, so a service that costs £75 in the North East might be £100–£120 in central London. The ranges below are indicative for a standard one-off combi service in 2026.
| Region | Typical service cost | Vs UK average |
|---|---|---|
| London | £95–£140 | +15–30% |
| South East | £85–£125 | +10–20% |
| South West | £75–£115 | Around average |
| East of England | £78–£115 | Around average |
| Midlands | £70–£110 | Slightly below |
| North West / Yorkshire | £68–£105 | Below average |
| North East | £65–£100 | Lowest |
| Scotland | £70–£115 | Varies by city / rural |
| Wales | £68–£108 | Below average |
| Northern Ireland | £65–£105 | Below average (note: oil common) |
Rural areas can also carry a small travel surcharge if engineers have further to drive. The single biggest saving lever is competition: get two or three local quotes and you will usually shave 10–20% off the first price. Our cost guides hub has regional breakdowns for other jobs too if you are budgeting a wider project.
Landlord obligations and the CP12 gas safety certificate
If you let out a property in England, Wales or Scotland, the Gas Safety (Installation and Use) Regulations 1998 place a legal duty on you as landlord to have every gas appliance and flue checked for safety every 12 months by a Gas Safe registered engineer. The record produced is commonly called a CP12 or Landlord Gas Safety Record.
What the law requires
- An annual gas safety check on all gas appliances and flues you own in the let property
- The check carried out by a Gas Safe registered engineer
- A copy of the record given to existing tenants within 28 days of the check, and to new tenants before they move in
- Records kept for at least 2 years
- Ongoing maintenance of pipework, appliances and flues in a safe condition
A CP12 gas safety check alone typically costs £60–£90 for one appliance, with each additional appliance adding roughly £10–£30. Note that a safety check is not the same as a full service — the check confirms the appliance is safe to use, while a service also cleans and maintains it. Many landlords sensibly book a combined service + CP12 for £100–£150 to keep the boiler both safe and efficient.
Penalties are serious. Failing to hold a valid gas safety certificate can lead to fines, invalidated insurance, and problems serving a valid Section 21 notice in England. If the worst happens and a tenant is harmed by an unsafe appliance, landlords can face prosecution. It is never worth cutting corners on gas safety.
Why servicing your boiler is worth the money
A boiler service can feel like an easy cost to skip — the boiler is working, so why pay? But an annual service earns its keep in four concrete ways.
1. It keeps your warranty valid
Almost every boiler manufacturer requires proof of an annual service to keep the warranty valid — often a 5, 7 or even 10-year guarantee. Miss a service and you may find the manufacturer refuses a claim, leaving you to fund a repair or replacement worth hundreds or thousands of pounds. The £70–£120 service is cheap insurance for that guarantee.
2. It protects efficiency — and your energy bills
A dirty, poorly-tuned boiler burns more gas to produce the same heat. A service cleans the heat exchanger, checks combustion with a flue gas analyser and re-tunes gas pressure, so the boiler runs at its rated efficiency. On a typical home, keeping a boiler in tune can save a meaningful slice off your annual heating bill — and a healthy boiler defers the cost of an early replacement.
3. It keeps your home safe
The most important reason is safety. A faulty boiler or blocked flue can leak carbon monoxide — an odourless, colourless gas that kills. A service includes combustion and flue checks specifically to catch this. Every home with a gas appliance should also have a working audible carbon monoxide alarm, tested regularly.
4. It catches small faults before they become expensive ones
A good engineer spots a weeping seal, a tired pump or a failing part before it strands you without heat in the middle of winter. Planned maintenance is nearly always cheaper than an emergency callout — and far less stressful.
Signs your boiler needs a service (or a look now)
You should service annually regardless, but these symptoms mean you should book sooner rather than wait for the yearly slot:
Yellow or orange flame
The flame should burn crisp blue. A lazy yellow or orange flame can signal incomplete combustion and possible carbon monoxide — treat as urgent.
Banging, gurgling or whistling
Kettling and odd noises often point to limescale or sludge in the heat exchanger or a failing pump.
Losing pressure repeatedly
If you keep re-pressurising the system, there may be a leak or a failing expansion vessel.
Radiators slow or cold at the bottom
Cold spots suggest sludge build-up — which may call for a power flush, not just a service (see below).
Frequent lockouts or error codes
Recurring fault codes and resets mean something is failing intermittently.
Black marks, soot or staining
Staining around the boiler casing is a red flag for poor combustion — switch off and call a Gas Safe engineer.
If you ever smell gas, do not switch anything on or off — turn off the gas at the meter if safe, open windows, leave the property, and call the National Gas Emergency Service on the number displayed at your meter. Then arrange a Gas Safe engineer.
A service is not a power flush — know the difference
These two jobs are often confused, and some households pay for one expecting the other. They are different in scope, purpose and price.
| Annual boiler service | Power flush | |
|---|---|---|
| What it does | Safety & efficiency check of the boiler | Deep-cleans sludge from the whole heating system |
| How often | Every year | Only when needed (sludge / cold radiators) |
| Typical 2026 cost | £70–£120 | £350–£900 (by system size) |
| Time on site | 30–60 minutes | Several hours to a full day |
| Triggered by | Routine / warranty | Cold spots, sludge, before a new boiler |
A power flush is a one-off remedial job that clears rust and sludge (magnetite) from radiators and pipework to restore circulation. It is often recommended before fitting a new boiler, or when radiators are cold at the bottom. A service will identify whether you might need a flush, but it does not include one. If you are weighing up a wider heating upgrade, our guide to central heating installation costs covers flushing, new radiators and system upgrades in detail.
Compare boiler service quotes from Gas Safe engineers
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Every engineer we match is asked to confirm their Gas Safe registration. You can always double-check any engineer’s licence free on the official Gas Safe Register before they start work.
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Get My Free Quotes →Boiler service cost — frequently asked questions
Once a year. Manufacturers and Gas Safe engineers recommend an annual service, and almost all boiler warranties require one to stay valid. Landlords must, by law, have a gas safety check on all gas appliances every 12 months. Booking in late summer or early autumn avoids the winter rush and any callout premium.
For homeowners, a service is strongly recommended but not legally required. For landlords, an annual gas safety check (the CP12) on all gas appliances is a legal requirement under the Gas Safety (Installation and Use) Regulations 1998. Note the safety check and a full service are slightly different jobs — many landlords book both together.
In most cases, yes. The majority of manufacturers require documented proof of an annual service by a Gas Safe registered engineer to honour a warranty claim — often for 5 to 10 years. Keep every service record. Missing a service can void the guarantee and leave you paying for repairs yourself, so the £70–£120 cost is well worth it.
Yes — even an out-of-warranty boiler still needs to be safe, and a service catches carbon monoxide risks and failing parts. That said, if your boiler is 12–15+ years old and needs frequent repairs, an engineer may advise that a replacement is more economical. A newer, efficient boiler usually pays back through lower gas bills and fewer breakdowns.
A CP12 (Landlord Gas Safety Record) confirms an appliance is safe to use at that moment — it is a legal check for rented properties, typically £60–£90. A full service also cleans and maintains the boiler for efficiency and longevity, typically £70–£120. Booked together, a service + CP12 usually costs £100–£150.
No. By law, only a Gas Safe registered engineer may work on a gas boiler in the UK. Always check their Gas Safe ID card and verify the licence on the official Gas Safe Register. Oil boilers are serviced by OFTEC-registered engineers instead. Letting an unregistered person touch your gas is dangerous and illegal.
A standard service on a healthy combi boiler takes around 30–60 minutes. System and regular boilers with a cylinder can take a little longer. If the engineer finds a fault that needs investigation or parts, it may run over — but they should explain any extra work and cost before doing it.
Not for the service alone — a one-off service (£70–£120) is cheaper than a year of cover (£120–£300). But cover also insures you against breakdown repairs, which can each cost £150–£500+. If your boiler is older or you want predictable costs, a plan can be worth the premium. For a newer, reliable boiler, paying per service is usually the better value.
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Ask a Free Question →Written by the BestBuilders Editorial Team · Reviewed by a Gas Safe registered heating engineer · Last updated: July 2026.
How we produced this guide: Prices are compiled from quotes gathered through the BestBuilders network of vetted local engineers in 2026 and cross-checked against published guidance. Legal duties reflect the Gas Safety (Installation and Use) Regulations 1998 and the Gas Safe Register, the UK’s official gas registration body. Always confirm current pricing and registration with your chosen engineer.