How Much Does a Boiler Service Cost in 2026?
A standard annual boiler service costs between £60 and £100. British Gas HomeCare covers it from about £12/month - but you end up paying more over the year for cover you might not need.
£75
Average cost
£60
Lowest price
~£12/mo
Homecare plan
30–60 min
Time taken
Prices updated April 2026 · Based on industry data and contractor submissions.
Boiler servicing must be carried out by a Gas Safe registered engineer. It is illegal to work on gas appliances without proper registration. Always check your engineer's credentials at gassaferegister.co.uk before any work begins.
Boiler Service Prices at a Glance
These are typical prices for a gas boiler service in the UK, carried out by a Gas Safe registered engineer.
| Service | Average Cost | Price Range |
|---|---|---|
| Standard annual boiler service | £75 | £60 – £100 |
| Landlord gas safety certificate (CP12) | £70 | £55 – £90 |
| Full service + power flush | £450 | £350 – £650 |
| Full service + magnetic filter fitting | £170 | £140 – £250 |
Prices based on industry averages. Actual costs vary by location and engineer.
Annual Service vs. Homecare Plan - Which Is Worth It?
Homecare plans bundle your annual service with breakdown cover. The question is whether the extra cost is justified - and for most people with a newer boiler, it is not.
| Provider | Monthly | Annual |
|---|---|---|
| British Gas HomeCare | ~£12/month | ~£144/year |
| Independent Gas Safe engineer | N/A | £60–£80/year |
| Worcester Bosch service plan | ~£8–£10/month | ~£96–£120/year |
| Local plumber service plan | ~£8–£15/month | ~£96–£180/year |
When a homecare plan makes sense
If your boiler is out of manufacturer warranty (typically 5–12 years old) and you would struggle to find £300–£500 at short notice for an emergency repair, a homecare plan gives you peace of mind. It also suits landlords who need guaranteed response times for tenants.
When it is a waste of money
If your boiler is still under manufacturer warranty, breakdowns are already covered. Paying £12/month for a homecare plan on top of that is doubling up. A standalone annual service at £60–£80 keeps your warranty valid and costs less than half the price of most homecare packages.
What Happens During a Boiler Service?
A standard boiler service takes 30–60 minutes. Here is what your engineer will do, step by step.
- 1
Visual inspection
The engineer checks the boiler casing, flue, pipework, and connections for visible damage, corrosion, or leaks. They also check the flue terminal outside for blockages.
- 2
Internal component checks
The boiler casing is removed and internal parts are inspected - burner, heat exchanger, ignition leads, seals, and electrodes. Worn parts are flagged and replaced if needed.
- 3
Gas pressure and flow tests
The engineer tests the gas pressure at the meter and at the boiler to make sure the supply is correct. They also check the burner pressure and adjust it if it has drifted.
- 4
Flue gas analysis
Using a flue gas analyser, the engineer measures the combustion gases leaving your boiler. This confirms the boiler is burning gas efficiently and safely - abnormal readings can indicate a cracked heat exchanger or other serious faults.
- 5
Safety checks and paperwork
The engineer checks for carbon monoxide leaks, tests the condensate drain, and verifies the boiler is operating at the correct pressure. You receive a service record - keep it safe as proof for warranty claims.
How Often Should You Service Your Boiler?
Once a year - no exceptions
Every boiler manufacturer recommends annual servicing. Most make it a condition of the warranty - miss a year and you could void the entire thing. Even once your warranty has expired, yearly servicing is the best way to catch problems early and keep your boiler running efficiently.
Landlords: it is the law
If you rent out a property, you are legally required to have every gas appliance checked annually by a Gas Safe registered engineer. You must provide tenants with a copy of the gas safety record (CP12) within 28 days of the check, or before they move in. Failing to do this can result in prosecution.
Best time to book
Book your service between April and August. Engineers have more availability, you can take your time finding the right one, and you will not be caught out by a fault just as winter hits. Set a calendar reminder for the same month each year.
Signs Your Boiler Needs Servicing Urgently
Do not wait for your annual service if you notice any of these. Some require immediate action.
| Warning Sign | How Urgent |
|---|---|
| Your boiler keeps losing pressure and you are topping it up regularly | Soon |
| The flame is yellow or orange instead of a steady blue | Urgent |
| You can smell gas near the boiler | Emergency - call the Gas Emergency line on 0800 111 999 |
| Radiators have cold spots at the bottom (sludge buildup) | Soon |
| The boiler is making banging, kettling, or gurgling noises | Soon |
| Your energy bills have crept up without any change in usage | Schedule a service |
| There is a dark stain or soot mark around the boiler | Urgent |
| Your carbon monoxide alarm has sounded | Emergency - ventilate and evacuate immediately |
How to Get Your Boiler Service for Less
A boiler service is not expensive, but there are still ways to avoid overpaying.
Book in spring or summer
Heating engineers are quieter from April to August. You will find it easier to get an appointment, and some engineers offer lower rates during off-peak months. Avoid October to January when everyone's boiler is breaking down at once.
Use an independent engineer, not a big brand
British Gas and similar national providers charge £90–£100+ for a standard service. A local Gas Safe registered engineer typically charges £60–£80 for exactly the same work. The qualification and process are identical - the only difference is who you are paying.
Skip the homecare plan unless you need peace of mind
Homecare plans from British Gas cost about £144/year. A standalone annual service costs £60–£80. You are paying an extra £60–£80 per year for breakdown cover you may never use. If your boiler is under manufacturer warranty, breakdowns are already covered - so a homecare plan is just doubling up.
Bundle it with a landlord gas safety check
If you are a landlord, ask for a combined service and CP12 certificate. Many engineers offer a discount when you book both together - expect to pay £90–£120 for the pair instead of £140+ separately.
Useful resources
- Gas Safe Register — Verify your engineer is legally qualified before any gas boiler work
- Building Regulations Part J — Safety requirements for combustion appliances including boilers
- Energy Saving Trust: Boilers — Independent advice on boiler efficiency and when to replace
Frequently Asked Questions
How much does British Gas charge for a boiler service?
A one-off British Gas boiler service costs around £90–£100. Their Homecare plans, which include an annual service plus breakdown cover, start from about £12/month (roughly £144/year). You are paying a premium for the convenience and brand name - independent Gas Safe engineers typically charge £60–£80 for the same service.
Is a boiler service worth it?
Yes. An annual service catches small issues before they become expensive repairs, keeps your boiler running efficiently (which lowers your gas bills), and is required to keep most manufacturer warranties valid. Skipping a service to save £70 can easily result in a £300+ repair bill or a voided warranty worth thousands.
Can I service my own boiler?
No. A boiler service must be carried out by a Gas Safe registered engineer. It is a legal requirement - working on gas appliances without Gas Safe registration is a criminal offence. There is no DIY shortcut here, and attempting one puts your household at serious risk from carbon monoxide poisoning or gas leaks.
What happens if I don't service my boiler?
Without regular servicing, your boiler's efficiency drops (costing you more on gas bills), minor faults go undetected until they become major breakdowns, and your manufacturer warranty is likely voided. Worst case, a neglected boiler can develop carbon monoxide leaks - a silent, potentially fatal risk. If you are a landlord, an annual gas safety check is a legal requirement.
Do I need a boiler service every year?
Every boiler manufacturer recommends annual servicing, and most require it to keep the warranty valid. If your boiler is under warranty and you skip a year, you risk voiding the entire warranty - which could mean paying full price for repairs that would otherwise be covered. Even for out-of-warranty boilers, annual servicing is the single most effective way to avoid breakdowns and extend the boiler's lifespan.
Written by James Carter, Less.co.uk energy specialist
Last updated: · Pricing based on industry data and verified contractor submissions · Methodology
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