Getting your boiler serviced once a year is one of those jobs most homeowners know they should do but often put off. Beyond keeping the warranty valid, a regular service genuinely reduces the chance of a breakdown in the depths of winter, and it keeps your boiler running efficiently so your energy bills stay lower.
Costs vary more than you might expect, from around £60 for a straightforward gas combi in a competitive urban market to well over £150 for an oil or LPG boiler in a rural area. This guide breaks down every factor that moves the price, so you know exactly what to budget and what to watch out for.
Standard Boiler Service Costs by Boiler Type
The type of fuel your boiler runs on is the single biggest factor in the base price. Gas engineers are more common, so competition keeps their rates lower. Oil and LPG engineers tend to serve rural areas with fewer competitors, and the service itself takes longer because of additional checks on the burner, oil filter, and storage components.
| Boiler Type | Typical Service Cost (2026) |
|---|---|
| Gas combi boiler | £60 to £120 |
| Gas system boiler | £65 to £125 |
| Gas heat-only (regular) boiler | £65 to £125 |
| Oil boiler | £90 to £160 |
| LPG boiler | £90 to £155 |
| Electric boiler | £50 to £90 |
Electric boilers have no combustion process, so the service is simpler and faster. Some electric boiler manufacturers only require a service every two to three years, so check your manual before booking annually.
How Location Affects the Price
Where you live in the UK moves the price noticeably. London and the South East consistently attract a premium, both because labour rates are higher and because many engineers factor in travel time and parking costs. In parts of Scotland, Wales, and rural England, lower overheads can mean cheaper rates, but reduced competition in very rural areas can push costs back up.
| Region | Average Gas Boiler Service Cost |
|---|---|
| London | £90 to £130 |
| South East England | £80 to £125 |
| South West England | £70 to £110 |
| Midlands | £65 to £105 |
| North West England | £60 to £100 |
| North East England | £60 to £95 |
| Yorkshire and the Humber | £60 to £100 |
| Scotland | £65 to £110 |
| Wales | £60 to £105 |
| Northern Ireland | £55 to £95 |
What Is Actually Included in a Boiler Service?
A Gas Safe registered engineer will typically carry out the following during a standard service. It is worth asking the company to confirm exactly what is included before you book, because some budget services skip certain checks.
- Visual inspection: The engineer checks the boiler casing, flue, pipework, and surrounding area for signs of corrosion, damage, or poor ventilation.
- Combustion analysis: A flue gas analyser is used to measure the efficiency of the burn and confirm the boiler is operating within safe parameters.
- Heat exchanger check: The engineer inspects for cracks or sooting that could indicate incomplete combustion or carbon monoxide risk.
- Gas pressure test: Inlet and operating pressures are checked against the manufacturer's specifications.
- Ignition and controls test: The ignition sequence, thermostat, and safety controls are all tested to confirm they function correctly.
- Seals and gaskets: Worn seals are identified, though replacement parts are usually charged separately.
- Cleaning: Accessible components such as the burner and spark electrodes are cleaned.
- Service record: The engineer signs off the boiler's service record, which is important for warranty purposes.
A standard service takes between 45 minutes and 90 minutes. If the engineer discovers a fault, diagnosis may extend the visit and additional repair costs will apply on top.
Extra Costs to Be Aware Of
A service price rarely covers everything that might come up on the day. The most common additional charges are as follows.
- Replacement parts: If the engineer identifies a worn part such as a pressure relief valve, diverter valve, or thermocouple, the part and fitting labour are charged separately. Budget £30 to £200 depending on the component.
- Power flush: If sludge is found in the system, a power flush costs £300 to £600 and is strongly recommended before it causes heat exchanger damage. Some engineers will spot this at service stage.
- Inhibitor top-up: Adding corrosion inhibitor to the system is sometimes charged at an additional £15 to £30.
- Gas safety certificate: Landlords requiring a CP12 certificate alongside the service typically pay an extra £20 to £40 on top of the service fee.
- Out of hours or weekend premium: Evening or weekend bookings can add £20 to £50 to the standard rate.
Boiler Service Plans and Annual Cover
Several energy suppliers and specialist companies offer boiler service plans that bundle the annual service with breakdown cover. These range from basic service-only plans to comprehensive cover that includes unlimited callouts and parts.
- Service only plan: Typically £5 to £10 per month, covering the annual service visit with no breakdown protection.
- Service plus emergency cover: Around £10 to £20 per month, including the annual service and emergency callout labour, but parts are often excluded or capped.
- Full boiler cover (service, parts, labour): Around £20 to £40 per month from providers such as British Gas HomeCare, Homeserve, and Corgi HomePlan. Watch for excess charges of £60 to £100 per callout on cheaper tiers.
Whether a plan is worth it depends on the age of your boiler. For a boiler under five years old still under manufacturer warranty, a standalone annual service is usually better value. For a boiler over ten years old, breakdown cover starts to make more financial sense.
How to Find a Reliable Engineer and Avoid Being Overcharged
All engineers working on gas appliances in the UK must be on the Gas Safe Register. You can verify any engineer's registration for free at gassaferegister.co.uk before they visit. For oil boilers, look for OFTEC registered technicians.
- Get three quotes: Prices genuinely vary. Spending ten minutes getting three quotes online or by phone can easily save £30 to £50.
- Check the Gas Safe Register: Do not accept any engineer who cannot provide their Gas Safe ID card on arrival. Check the card matches the work type listed.
- Avoid very cheap quotes: A service advertised at under £50 for a gas boiler is a red flag. It may indicate a cut-price, minimal-check visit that misses real problems.
- Book in spring or summer: Demand is lower and some engineers offer slight discounts compared to the busy autumn and winter period.
- Use Which? Trusted Traders or Checkatrade: Reviews give you a realistic picture of reliability and whether the quoted price is what you actually end up paying.
Does a Boiler Service Save Money in the Long Run?
The short answer is yes, in most cases. A well-maintained boiler operates closer to its rated efficiency. A gas combi running at 88 percent efficiency rather than 82 percent will save a meaningful amount on fuel over a year, particularly at current gas prices. The Energy Saving Trust estimates that keeping a boiler well serviced can save households £50 to £100 per year in energy costs compared to a poorly maintained unit of the same age.
Beyond efficiency, catching a small fault early, such as a worn seal or a slightly incorrect gas pressure, prevents that fault from developing into a full breakdown. An emergency callout in January easily costs £150 to £400 or more. Against that, an £85 annual service looks very reasonable indeed.
For most UK households in 2026, a gas boiler service costs between £60 and £120, with a national average around £85. Oil and LPG boilers cost more at £90 to £160. London and the South East sit at the top of the range. Always verify your engineer is Gas Safe registered, get at least three quotes, and book in the warmer months to avoid the winter premium. A service plan can offer peace of mind if your boiler is over ten years old, but for newer boilers a one-off annual service is usually the better value option.