Boiler Repair Cost 2026: What You Should Pay
Most boiler repairs cost between £150 and £500 including parts and labour — but the number depends almost entirely on which component failed, and nobody can know that until an engineer has looked. Here are the typical ranges by fault, the repair-versus-replace maths engineers actually use, and what a fair quote should show.
How much does a boiler repair cost?
Most boiler repairs fall between £150 and £500 including parts and labour. That range is wide for a reason: the cost is driven almost entirely by which component failed, and that cannot be known until an engineer has looked at it. The table below shows what typically sits where, so you can sanity-check a quote rather than guess.
| What went wrong | Typical range | Why it varies |
|---|---|---|
| Diagnostic call-out | £60 – £120 | Often deducted from the repair if you go ahead |
| Thermostat or pressure fault | £150 – £250 | Usually parts-light, one visit |
| Pump or diverter valve | £250 – £450 | Part cost varies by make and access |
| Fan or gas valve | £300 – £500 | Manufacturer-specific parts |
| PCB (circuit board) | £400 – £600 | Expensive part; often a replace-vs-repair trigger |
| Heat exchanger | £500 – £800+ | Labour-heavy; frequently uneconomic on an old boiler |
These are ranges, not a quote — the real number depends on the fault, the make and your area. Get my exact price →
What you are actually paying for: parts vs labour
A repair bill has three ingredients, and a fair quote shows them separately rather than as one round figure. Knowing roughly what each should be makes an inflated quote easy to spot.
- The call-out or diagnostic fee — typically £60–£120, and often deducted from the final bill if you go ahead with the repair. Some firms fold it into their hourly rate instead.
- Labour — most heating engineers charge around £40–£80 an hour, or roughly £150–£300 for a half to full day. A straightforward fix is usually one to two hours on site.
- Parts — the biggest swing factor. A thermostat or pressure sensor is often £20–£60; a pump or diverter valve £80–£200; a fan or gas valve £100–£250; a PCB (circuit board) £150–£350. Manufacturer-branded parts for newer combi boilers cost more than universal equivalents.
Because the part is where most of the cost and variation sits, the same fault can be priced very differently by two engineers — which is exactly why it pays to compare more than one quote on the same described problem.
Repair or replace? The honest maths
Engineers see the same decision every week, and the arithmetic is usually straightforward once you know three things: the boiler's age, whether parts are still made for it, and what the repair costs relative to a new unit.
- Under 8 years old, part available — repair. The boiler has years of life left and a replacement cannot be justified on efficiency alone.
- 8–12 years old — judgement call. If the repair is under about a third of replacement cost and nothing else is failing, repair. If this is the second fault in a year, start pricing a replacement.
- Over 12 years old, or parts obsolete — usually replace. You are paying to keep an inefficient appliance alive, and the next failure is rarely far away.
If you land on replacement, our boiler replacement cost guide has the current ranges, and the boiler cost calculator will get you closer before you speak to anyone. It also pays to know the job types and brands before a breakdown forces your hand: our new boiler cost by type guide explains why a like-for-like swap costs far less than switching system type, and our best boiler brands guide compares warranty length against installed price — the two numbers that decide whether a replacement is good value rather than just the quickest way to get the heating back on.
What a fair repair quote looks like
- The diagnosis is stated in writing — which part, and why it failed.
- Parts and labour are separated, not merged into one round number.
- The call-out fee is explained, including whether it comes off the repair.
- Any guarantee on the repair is named, with its length.
- The engineer's Gas Safe registration number appears on the paperwork.
- If replacement is recommended, you are given the reason, not just a sales pitch.
⚠ Gas safety: if you smell gas or suspect carbon monoxide, do not wait for a quote. Leave the property, and call the National Gas Emergency Service on 0800 111 999.
How long does a repair take?
Most repairs are a single visit of one to two hours where the engineer already carries the part. Where a component must be ordered, a return visit within a few days is normal. Winter demand lengthens waits — the first cold snap of the year is when every heating engineer's diary fills at once, which is the practical argument for an annual boiler service before the season rather than after a breakdown.
What pushes a boiler repair cost up or down
Two homes with the same fault can get different quotes for reasons that have nothing to do with the engineer being unfair. The main factors:
- Which component failed — by far the biggest driver, as the table above shows. A sensor is cheap; a heat exchanger rarely is.
- The make and age of the boiler — parts for common current models are widely stocked, but obsolete or premium-brand parts cost more and can take longer to source.
- Where you live — labour rates in London and the South East typically run above the national average, while rural areas can carry a travel element.
- When you call — evening, weekend and emergency call-outs are charged at a premium, and the first cold snap of winter is when engineers are busiest and least able to discount.
- Whether it is still under warranty — a boiler inside its manufacturer guarantee, with annual services logged by a Gas Safe engineer, may have the repair covered at no cost. Missed services are the usual reason a claim is refused.
None of these should be a surprise on the invoice. If a quote is well above the ranges here, ask which of these factors is driving it — a straight answer is itself a good sign.
Boiler repair costs compared
Where this job sits against the other boilers & central heating jobs, on 2026 UK prices. Your own quote depends on size, access and spec.
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