Your boiler has broken down — and the first question most people ask is: how much is this going to cost?
The honest answer is that boiler repair prices vary quite a bit, depending on the fault type, your location, and the engineer you choose. But you don’t need to go in blind. This guide gives you real 2026 price ranges, explains exactly what affects the bill, and shows you how to avoid being overcharged.
Need a quote now? Get a free, no-obligation estimate from a local Gas Safe engineer.
Average Boiler Repair Costs at a Glance
The table below shows typical repair costs for common faults in the UK. These figures include both the callout fee and labour — but parts are often charged separately on top.
| Fault Type | Typical Cost (inc. callout) |
|---|---|
| Boiler pressure issue (repressurise) | £80 – £120 |
| Thermostat replacement | £100 – £200 |
| Diverter valve replacement | £150 – £300 |
| Printed circuit board (PCB) | £200 – £350 |
| Pump replacement | £150 – £300 |
| Heat exchanger replacement | £300 – £500+ |
| Gas valve replacement | £200 – £350 |
| Pilot light / ignition fault | £100 – £200 |
| Condensate pipe blockage | £80 – £150 |
| Annual boiler service | £60 – £120 |
These are ballpark figures for England. Prices in London and the South East run roughly 15–25% higher than the national average.
What Affects the Cost of Boiler Repair?
1. Your Location
Labour rates vary significantly across the UK. An engineer in central London or the Home Counties will charge considerably more than one in the Midlands or the North. If you’re in Birmingham, Manchester, Leeds, or Sheffield, you’ll typically pay less than someone in London for the same job.
2. Boiler Brand and Age
Parts for older or discontinued boiler models can be hard to source and expensive. Boilers from Worcester Bosch, Vaillant, and Baxi tend to have widely available parts, which keeps costs down. A 15-year-old boiler from a less common manufacturer may require parts to be ordered specially — adding both cost and waiting time.
3. Fault Severity
A simple repressurise or reset takes 30 minutes and costs relatively little. A heat exchanger replacement — one of the most expensive repairs — requires several hours of work and an expensive part. The engineer’s diagnostic visit will determine which category your fault falls into.
4. Time of the Call
Standard weekday hours (roughly 8am–6pm) are the cheapest. Evening, weekend, and bank holiday callouts attract an uplift — typically 30–50% more. Genuine emergencies outside of hours will cost more; that’s worth budgeting for if your boiler fails in January.
5. Independent Engineer vs. National Provider
Independent Gas Safe engineers generally charge less than national brands like British Gas. The gap can be substantial — see the comparison section below.
Callout Fees Explained
A callout fee — sometimes called a call-out charge or diagnostic fee — covers the engineer’s travel to your property and the initial fault diagnosis. It is not the same as the full repair cost.
What to expect:
- Independent Gas Safe engineer: £60 – £100
- British Gas (non-Homecare): £99+
- Emergency/out-of-hours (independent): £100 – £180
Important: Always ask whether the callout fee is deducted from the repair cost if you proceed. Many independent engineers operate on this basis — so if the repair costs £200 and the callout was £80, you pay £200 total, not £280. This is well worth confirming upfront.
Some engineers advertise no-fix-no-fee, meaning you only pay if the fault is resolved. This is not universal, but worth looking for when comparing quotes.
British Gas vs. Independent Engineer: Which Costs Less?
This is one of the most-searched questions on the topic — and for good reason.
| British Gas | Independent Engineer | |
|---|---|---|
| Callout fee | £99+ | £60 – £100 |
| Hourly labour rate | £80 – £120/hr | £50 – £90/hr |
| Annual Homecare cover | From £18/month | N/A |
| Response time | 24–48 hrs (Homecare: faster) | Often same-day |
| No-fix-no-fee | No | Often yes |
| Parts availability | Excellent | Good (depends on engineer) |
The verdict: For a one-off repair without any existing cover, an independent Gas Safe engineer is almost always better value. British Gas’s pricing makes sense primarily if you’re on a Homecare plan that covers the callout and gives you priority response — otherwise, the premium is hard to justify.
Always verify any engineer you hire is on the Gas Safe Register — it is a legal requirement for anyone working on gas appliances in the UK.
Fixed Price vs. Hourly Rate: Which Is Better?
Fixed price means you’re quoted a single total before work begins — covering diagnosis, labour, and parts. This gives you certainty and protects against a job running over time. Always ask for a fixed-price quote in writing before the engineer starts.
Hourly rate is more common for diagnostic visits where the fault isn’t yet known. Once the fault is identified, a good engineer will give you a fixed price for the repair itself. Be cautious of any engineer who refuses to give a fixed price once the fault has been diagnosed.
What to ask before booking:
- Is the callout fee included or separate?
- Will you provide a fixed price after diagnosis?
- Are parts charged at cost price or marked up?
- Do you operate no-fix-no-fee?
- Are you Gas Safe registered? (Ask for their registration number.)
How to Avoid Being Overcharged
1. Get at least three quotes. Even for an urgent repair, a quick call to two or three local engineers takes minutes and can save you £100 or more.
2. Check Gas Safe registration. Visit gassaferegister.co.uk and enter the engineer’s ID number before they arrive. This is free and takes 30 seconds. Any legitimate engineer will give you their registration number without hesitation.
3. Ask for a written quote. A verbal estimate is not binding. Ask for the quote by text or email before you agree to the work.
4. Be wary of unusually low quotes. A quote that’s dramatically cheaper than others may indicate unlicensed work, substandard parts, or hidden charges to follow. Gas work carried out by an unregistered engineer is illegal and can void your home insurance.
5. Ask about parts warranties. Reputable engineers will guarantee their parts (typically 12 months). If a part fails within the warranty period, they should return and fix it at no additional charge.
Get a free quote from a vetted local engineer — no obligation.
Frequently Asked Questions
How much does boiler repair cost in the UK?
Most boiler repairs cost between £80 and £350 in the UK. Simple fixes like a faulty thermostat or pressure issue sit at the lower end (£80–£150), while complex faults such as a heat exchanger replacement can reach £300–£500+. Labour typically accounts for the majority of the cost.
What is a callout fee for a boiler engineer?
A callout fee covers the engineer’s travel time and the first diagnostic visit. Independent Gas Safe engineers typically charge £60–£100; British Gas charges £99 or more for non-Homecare customers. Some engineers include the callout fee within a fixed repair price — always ask before booking.
Does British Gas charge a callout fee?
Yes. British Gas charges a callout fee for customers who are not on a Homecare plan. As of 2026, this is typically £99 or more. Homecare customers have callout fees included in their monthly subscription, which starts from around £18 per month.
How much is a gas callout in the UK?
A gas callout from an independent Gas Safe engineer typically costs £60–£100. British Gas and other national providers charge £99 or more. Emergency out-of-hours callouts — evenings, weekends, or bank holidays — can be £120–£180 or higher.
Is it worth repairing an old boiler?
If a boiler is more than 10–12 years old and the repair cost exceeds 50% of a new boiler’s price, replacement is usually the better financial decision. A new A-rated condensing boiler also reduces energy bills significantly. For younger boilers, repair is almost always cheaper.
Can I negotiate a boiler repair price?
Yes. Always get at least two or three quotes from Gas Safe registered engineers. Ask specifically whether the callout fee is included in the repair quote, whether parts are charged at cost price, and whether they operate a no-fix-no-fee policy.
Ready to Get a Quote?
Boiler repairs don’t have to be stressful — or overpriced. We connect homeowners across the UK with vetted, Gas Safe registered engineers who provide transparent, fixed-price quotes before any work begins.
Whether you’re in London, Manchester, Birmingham, Leeds, or Sheffield — fill in the form below and we’ll match you with a local engineer within minutes.