How much does a boiler repair cost in London?
A typical London boiler repair costs £180–£420 including parts. The exact price depends on the fault — see below for typical costs by fault type.
Low
£180
per repair
High
£420
Based on London market research, updated September 2026. First-party London Heroes data will replace this as jobs complete.
These are market-research figures, not London Heroes job data. London Heroes publishes what its own completed jobs cost in the London Home Repair Index, job by job, as they complete.
The research this band is drawn from does not state a VAT position.
Prices and guidance last checked on against the committed London price research this band is drawn from and the UK regulatory records behind our service pages.
Common faults and typical costs
Diverter valve replacement typically runs £250–£350. Central heating pump replacement £230–£390. Printed circuit board (PCB) faults are the expensive end at £300–£550 — at which point, on an older boiler, engineers will discuss whether repair still makes sense.
Diagnosis usually takes the first 30–60 minutes. A good engineer explains the fault, the part needed, and the total before continuing.
Repair or replace?
The rule of thumb most engineers use: if the boiler is over 10 years old and the repair exceeds a third of replacement cost, get a replacement quote before committing. A modern boiler also cuts gas bills, which changes the maths.
Common questions
Who can legally repair a gas boiler?
Not sure yet what needs doing? Boiler not working: causes and what to do goes through the likely causes and what you can check before you pay for a call-out.
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This guide is general information, not a quote or a substitute for advice from a qualified professional.