BoilerFaultCodesWhat a boiler service costs, and how to tell if you got one.
Expect to pay somewhere between £70 and £120 for a standalone boiler service from an independent Gas Safe registered engineer. National companies charge more, often £90 to £150. The bigger question is not the price. It is whether what you paid for was a service or somebody glancing at the flame for ten minutes and writing you a receipt.
| What you're buying | Typical cost |
|---|---|
| Standalone service, independent engineer | £70 to £120 |
| Standalone service, national company | £90 to £150 |
| Service plus gas safety certificate (landlord) | £100 to £180 |
| Gas safety certificate only, one appliance | £60 to £100 |
| Service included in a cover plan | From about £10 a month |
Prices are typical UK ranges for 2026. London and the South East sit at the top of each band. Rural callouts can add travel.
A service and a safety certificate are not the same thing
People use the terms interchangeably and they should not. A gas safety certificate (CP12) checks that the appliance is safe to use. It is a legal requirement for landlords every twelve months. It does not include cleaning anything.
A service is maintenance. It includes the safety checks, then goes further: the casing comes off, components get cleaned, wear gets measured against the manufacturer's figures. If you are a landlord you need the certificate. If you want the boiler to last, you want the service. Most engineers will do both in one visit for less than the two prices added together.
What a proper service includes
A real service takes 45 minutes to an hour and the casing comes off. Here is what should happen.
Flue gas analysis, with the readings written on your paperwork
The casing removed and the combustion chamber inspected
Burner and heat exchanger checked and cleaned
Gas pressure and flow rate measured against the manufacturer's figures
Seals and electrical connections checked for wear
The condensate trap cleaned out
System pressure checked and topped up if needed
Safety devices and the flue tested
A written report handed over, with the readings on it
Signs you did not get a real service
- It took fifteen minutes
- The boiler casing never came off
- No flue gas analyser was used
- You were given a receipt with no readings on it
Ask for the figures. An engineer who has done the work will have them and will be happy to talk you through them.
Check the engineer is registered
Anyone working on a gas boiler in the UK must be on the Gas Safe Register. Every registered engineer carries an ID card with a licence number and a photo, and the back lists exactly which work they are qualified to do. You are entitled to ask to see it, and you can check the number on the Gas Safe Register website before they start.
It takes a minute and it is the single most useful thing you can do to avoid a bad job.
Is an annual service worth the money?
Two arguments carry real weight, and one of them is often overlooked.
The first is your warranty. Most manufacturers require an annual service by a registered engineer to keep it valid, and they do ask for the paperwork when you claim. On a boiler with seven years left to run, skipping a £90 service to protect a warranty worth well over a thousand pounds is poor arithmetic.
The second is timing. Boilers fail when you start using them, which means the coldest week of the year, which is also the week every engineer in your area is booked solid. Servicing in September buys you the fault at a convenient moment rather than an inconvenient one.
Book it before the cold arrives
Demand climbs through September and October and stays high until February. Prices firm up and lead times stretch. If you are reading this in late summer, that is the cheapest and easiest moment of the year to get it done.
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
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