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General heating work in London costs £60 to £125 for a weekday call-out and £80 to £140 an hour. Fixed-price jobs: an annual boiler service £80 to £150, a landlord gas safety certificate £50 to £120, a magnetic filter £150 to £240 fitted, a power flush from £450 and a like-for-like combi replacement £1,800 to £3,800.
| Job | London low | London typical | London high | UK typical | What moves the price |
|---|---|---|---|---|---|
| Call-out and diagnosis, weekday | £60 | £120 | £125 | £80 | Often waived if a repair goes ahead |
| Labour, per hour | £80 | £110 | £140 | £70 | London firms charge £80 to £120 an hour against £60 to £80 elsewhere |
| Out-of-hours or emergency, first hour | £140 | £180 | £260 | Evenings, weekends and bank holidays | |
| Annual boiler service | £80 | £95 | £150 | £100 | Book in September or early October; November to January is the rush |
| Landlord gas safety certificate (CP12) | £50 | £80 | £120 | £75 | Boiler and one appliance; £10 to £20 per extra appliance |
| Service and CP12 in one visit | £85 | £150 | £180 | Cheaper than two visits | |
| Oil or LPG boiler service | £120 | £150 | £180 | For homes off the gas grid | |
| Magnetic filter, supplied and fitted | £150 | £195 | £240 | £220 | Standard on new London installations because of the hard water |
| Power flush, flat with 6 radiators | £450 | £525 | £620 | £435 | £60 to £85 per radiator; a 3-bed with 8 to 10 radiators is £650 to £800 |
| Combi boiler, like-for-like replacement | £1,800 | £2,500 | £3,500 | £2,300 | Fully fitted; pipework or flue changes take it to £3,000 to £4,500 |
General heating work is the maintenance and the small jobs around a working system: the annual service, the landlord gas safety check, a thermostat or timer that needs replacing, a radiator that will not heat, or advice on whether an old boiler is worth keeping. London heating firms price it by time, £80 to £140 an hour, with fixed prices for the service and the certificate.
London has 3.2 Gas Safe registered engineers per thousand households, against 4.8 in the North West, and demand peaks from November to January, so book routine work in September or early October. Firms build ULEZ, the Congestion Charge and parking permits in boroughs such as Camden and Westminster into their quotes. Hard water makes a magnetic filter standard on new installations.
Any work on the gas side must be done by a Gas Safe registered engineer; check the number on their card by texting Gas and the number to 85080. A missed annual service can void the boiler warranty. Before booking a fault call: reset the boiler once, read the pressure gauge, check the thermostat, timer and fuse board switch, and leave the casing shut.
Prices last checked: September 2026. Based on the published 2026 service, certificate, repair, flush and installation prices of six London heating firms, MyJobQuote's 2026 guides and Checkatrade snippets. PROS AI does not yet have enough completed general heating jobs in London to publish its own averages.
£60 to £125 for a weekday call-out and £80 to £140 an hour after that; £140 to £260 for the first hour out of hours. Fixed-price jobs: an annual service £80 to £150, a landlord gas safety certificate £50 to £120, both together £85 to £180, a magnetic filter £150 to £240 fitted and a power flush £450 to £620 for a flat with six radiators.
For the warranty, yes: manufacturers require a service every 12 months and a gap can void it. A standard service does not include a gas safety certificate or an electrical certificate. If you let the property, the law separately requires a gas safety check every 12 months by a Gas Safe engineer, with the certificate to tenants within 28 days; it can be done up to two months early without moving the anniversary date.
Anything that touches gas: the boiler, the gas pipe, the service and the safety certificate. Only a Gas Safe registered engineer may do it; the card carries a seven-digit licence number you can check by texting Gas and the number to 85080 or calling 0800 408 5500. Work on the water side, such as radiators, valves, pumps and flushing, is not gas work, but disconnecting the boiler to do it is.
September or early October for routine work. London firms see demand surge from November to January, and with 3.2 Gas Safe engineers per thousand households, against 4.8 in the North West, winter bookings are the hardest to get. A weekday daytime call-out is £60 to £125; the same visit out of hours is £140 to £260 for the first hour.
It depends on the age and the fault. A pump, valve or pressure fault at £120 to £420 is worth fixing on almost any boiler. A circuit board at £290 to £650 or a heat exchanger at £450 to £880 on a boiler near the end of its life is usually the moment to price a replacement: a like-for-like combi in London is £1,800 to £3,800 fitted, with a 92 per cent efficiency minimum under Boiler Plus.
Written by Shay Hazan, PROS AI.
£80 - £480call-out + hourly
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