Boiler Service Cost
£80–£150
typical UK range
Updated
An annual boiler service in the UK costs £80–£150 for a standard gas combi or system boiler. London and South East prices are typically £120–£180. All gas boiler services must be carried out by a Gas Safe registered engineer.
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How much does each option cost?
| Type / scope | Typical cost | Notes |
|---|---|---|
| Standard gas combi boiler serviceAnnual service of a standard combi boiler — visual inspection, combustion analysis, flue check, safety tests | £80–£130 | Annual service of a standard combi boiler — visual inspection, combustion analysis, flue check, safety tests |
| System or regular (heat-only) boiler serviceSlightly more complex than combi servicing due to additional components (cylinder, tank); takes a little longer | £90–£150 | Slightly more complex than combi servicing due to additional components (cylinder, tank); takes a little longer |
| Gas boiler service — London and South EastHigher labour rates apply in London and the South East | £120–£180 | Higher labour rates apply in London and the South East |
| Boiler service with carbon monoxide alarm testMost reputable engineers include CO alarm testing; minor additional cost if a new alarm is needed (£20–£40) | £90–£150 | Most reputable engineers include CO alarm testing; minor additional cost if a new alarm is needed (£20–£40) |
| Landlord Gas Safety Certificate (CP12)Landlords must have this certificate renewed annually for each gas appliance; includes the boiler service | £80–£150 | Landlords must have this certificate renewed annually for each gas appliance; includes the boiler service |
| Service + minor repair (e.g. faulty ignition, sensor replacement)If minor faults are found during the service, they may be fixable in the same visit at additional cost | £150–£350 | If minor faults are found during the service, they may be fixable in the same visit at additional cost |
What affects the price?
- Boiler type and manufacturer — some premium boilers (Viessmann, Ideal) take longer to service; the manufacturer may specify intervals and procedures that affect time
- Age of boiler — older boilers take longer to service and may need additional cleaning
- Location — London and South East rates are typically £30–£50 higher than the national average
- Combination with other gas work — if your plumber is already doing other gas work at the property, a combined visit reduces the effective callout cost
- Whether a gas safety certificate (CP12) is needed — for landlords, the certificate documentation adds marginal additional time
- Brand of engineer — manufacturer-branded service engineers (e.g. Worcester Bosch approved) often charge 15–30% more than independent Gas Safe engineers
What's included in the price?
- Visual inspection of boiler and accessible flue
- Internal boiler inspection — heat exchanger, burner, ignition, seals, and safety devices
- Combustion analysis to ensure the boiler is burning gas efficiently and safely
- Flue gas analysis to check combustion products are being safely expelled
- Water and gas pressure checks
- Testing of safety controls and gas valve operation
- Carbon monoxide alarm check (many engineers include this)
- Gas Safety Certificate (CP12) for landlords if required
- Advice on any findings or recommended actions
How long does it take?
A standard gas boiler service takes 45–90 minutes. A system or heat-only boiler service may take slightly longer. If minor repairs are needed on the day (cleaning, sensor replacement), allow an additional 30–60 minutes. Schedule your annual boiler service ideally in August or September to prepare for the winter heating season — this is when engineers have more capacity than in November when demand peaks.
Do I need one?
Annual boiler servicing is a legal requirement for landlords — the Gas Safety (Installation and Use) Regulations 1998 require annual gas safety checks on all gas appliances in rented properties. Homeowners are not legally required to service their boiler, but most manufacturer warranties are voided if annual servicing cannot be evidenced. Regular servicing extends boiler life, maintains efficiency (a poorly serviced boiler can be 10–15% less efficient), and identifies safety issues before they become emergencies. Gas Safe Register strongly recommends annual boiler services for all property types.
How do you avoid overpaying?
- Book your service in the spring or summer (April–August) when engineers are less busy and may offer slight discounts vs the autumn rush
- Ask your regular plumber if they do boiler servicing — using someone you already trust is usually good value
- Consider a boiler cover plan (British Gas HomeCare, Hive Service Plan, etc.) which includes annual servicing plus breakdown cover — typically £100–£250/year, often better value than separate servicing plus paying emergency rates
- For landlords with multiple properties, negotiate a portfolio rate with one Gas Safe engineer — discounts of 10–20% are common for 3+ properties
- Avoid manufacturer-only servicing unless your warranty specifically requires it — an independent Gas Safe engineer costs less and works on all makes
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Frequently asked questions
We’re happy to answer all your questions.
How much does a boiler service cost in the UK?
A standard annual gas boiler service costs £80–£130 in most of the UK. London and South East prices are typically £120–£180. All boiler services must be carried out by a Gas Safe registered engineer. Landlords require a Gas Safety Certificate (CP12) alongside the annual service.
How often should a boiler be serviced?
Once a year is the standard recommendation and is a legal requirement for landlords. Most manufacturers void their warranty if annual servicing cannot be evidenced. The best time to book is late summer (August–September) before the heating season, when engineers have more availability.
What happens during a boiler service?
The engineer inspects the boiler internally and externally, checks the flue and combustion analysis, tests safety controls, inspects water and gas pressure, and checks for any signs of corrosion or wear. A carbon monoxide alarm test is often included. The whole process takes 45–90 minutes.
Can any plumber service my boiler?
No. All gas boiler work, including servicing, must be carried out by a Gas Safe registered engineer. Verify registration at gassaferegister.co.uk before booking. For a landlord Gas Safety Certificate (CP12) to be valid, it must be signed by a Gas Safe registered engineer.
Is boiler servicing a legal requirement?
For landlords, yes — annual gas safety checks including boiler servicing are required by law under the Gas Safety (Installation and Use) Regulations 1998. For homeowners, it's not a legal requirement but is strongly recommended for safety, efficiency, and to maintain manufacturer warranty.
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