Boiler service cost in the UK
A standard boiler service in the UK typically costs between £80 and £140 for a single annual visit by a Gas Safe engineer. A landlord gas safety check (CP12) runs £60–£100 on its own, and most landlords bundle it with a service for £110–£170. Annual servicing is required to keep manufacturer warranties valid.
Homeowners researching this typically also price up boiler installation cost in the uk, boiler replacement cost in the uk and combi boiler installation cost in the uk. For wider context, browse our bathroom pricing, kitchen pricing and trades day rates.
Cost table
| Item | Typical range (GBP) |
|---|---|
Standard combi service | £80–£140 |
System / conventional boiler service | £90–£160 |
Landlord CP12 only | £60–£100 |
CP12 + service combined | £110–£170 |
Multi-appliance gas safety (1 boiler + 2 gas) | £90–£160 |
Annual service plan (boiler cover) | £150–£360/year |
Labour costs
A service takes 30–60 minutes and includes flue gas analysis, casing inspection, fault check and seal of the boiler. Servicing must be done by a Gas Safe registered engineer.
| Item | Typical range (GBP) |
|---|---|
Engineer call-out & service (1 hr) | £80–£140 |
Additional appliance (each) | £25–£50/each |
CP12 issue and certificate | £25–£50 |
Magnetic filter clean | £30–£80 |
Replacement parts (per hour fault work) | £60–£110/hr |
Materials costs
Servicing material cost is minimal unless parts are needed. Common consumables include seals, washers and a small amount of inhibitor top-up.
| Item | Typical range (GBP) |
|---|---|
Seals & washers | £5–£25 |
Inhibitor top-up | £8–£25 |
Magnetic filter cartridge | £15–£50 |
Replacement expansion vessel | £70–£180 |
Replacement diverter valve | £90–£220 |
Factors affecting cost in the UK
- ·Single combi vs multi-appliance gas check.
- ·Whether the service includes a CP12 certificate for landlords.
- ·Boiler condition — repairs add hourly labour and parts.
- ·Service plan vs pay-per-visit — plans spread cost monthly but include cover.
- ·Region — London adds 20–35% on engineer call-out.
Ways to reduce cost
- ·Book in spring or summer — engineer rates are lower than peak winter.
- ·Bundle the service with a landlord CP12 to share the visit fee.
- ·Use a local Gas Safe engineer rather than a national brand — same standard, lower call-out.
- ·Check for boiler cover via your home insurance — sometimes service is included.
- ·Skip service plans unless you also want breakdown cover; pay-per-visit is cheaper for newer boilers.
Frequently asked questions
- How often should a boiler be serviced?
- Annually. Manufacturer warranties require it and a service detects sludge, corrosion and CO2 issues before they cause breakdowns.
- What's the difference between a service and a CP12?
- A CP12 is a gas safety certificate for landlords. A service is a deeper inspection including flue gas analysis, seal checks and component inspection.
- Can a boiler service include a powerflush?
- No — a service is 30–60 minutes. A powerflush is a separate £300–£600 job that cleans sludge from radiators and pipework.
- Is a service worth it if my boiler is working fine?
- Yes — most failures show as small symptoms first. Service catches them and keeps the warranty valid.
- Do I need a service if my boiler is new?
- Yes — all manufacturer warranties (Worcester, Vaillant, Ideal) require an annual service to remain valid.
- What happens if the engineer fails the boiler?
- If immediately dangerous they will lock it out (warning notice) and disconnect the gas. Less serious faults result in advisory notices to repair within a set period.