Boiler Service Cost: What You Should Pay in 2026

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A boiler service in the UK in 2026 typically costs £80 to £120, with most homeowners paying around £100 for a standard annual gas boiler service. Prices vary by boiler type, where you live, and whether you pay for a one-off visit or a monthly cover plan. Oil boilers cost more (around £140), London prices run higher than the rest of the country, and the cheapest “deals” are sometimes cheap because they skip the most important test.

This guide breaks down the real cost of a boiler service in 2026 by boiler type and region, explains exactly what a proper service should include and where your money actually goes, compares paying as you go against a cover plan, and is honest about the most important number of all: what it costs you if you skip the service altogether.

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Boiler service cost by type

The biggest single factor in what you pay is the type of boiler. Combi boilers are generally the quickest and cheapest to service, as they are compact, have fewer components, and are easier to access. Oil boilers cost the most, because they are dirtier and require additional checks on the tank and supply pipes.

Note that gas boilers must be serviced by a Gas Safe registered engineer, while oil boilers must be serviced by an OFTEC qualified engineer. The age of your boiler also matters: older units typically take longer and need more checks, which can push the price up.

Boiler service cost by region

Where you live makes a real difference, largely because of labour costs and whether local firms are VAT registered. London is consistently the most expensive, while the Midlands and parts of the North tend to be the cheapest, partly because they have more small, independent, non-VAT-registered engineers.

These are broad guides rather than fixed prices. The single best way to know what a fair price is in your area is to compare two or three quotes from Gas Safe registered engineers.

One-off service or a cover plan?

You have two main ways to pay. A one-off annual service is a single fee for a single visit, simple and predictable. A boiler cover plan is effectively an insurance policy: you pay monthly, and in return you get the annual service plus some level of breakdown and repair support, sometimes including parts.

Boiler and central heating cover that adds repairs and call-outs runs higher, typically £180 to £300 a year. In our view, a one-off service plus setting aside a little each year for repairs often works out cheaper over time on a newer boiler, while a cover plan suits people who would rather pay a fixed monthly amount and have breakdown support, particularly on an older boiler. One thing to check on older boilers: some plans exclude parts that are obsolete or no longer available.

What is included in a boiler service?

A boiler service is not a product, it is roughly 60 to 90 minutes of a qualified engineer’s time plus a set of checks and tests. A proper annual service for a gas boiler should include:

• Visual inspection. The engineer checks the pipework, casing, expansion vessel, condensate trap and any visible signs of corrosion or leaks.
• Internal component check and clean. The burner, heat exchanger and other key parts are inspected, and cleaned where needed.
• Flue gas analysis. A calibrated analyser measures the carbon monoxide, carbon dioxide and ratio at the flue, confirming the boiler is burning cleanly and safely. This is the single most important part of the service, and the one most homeowners do not realise exists.
• Gas pressure and tightness test. Confirms the boiler is getting the correct gas supply with no leaks.
• Safety checks. Including ventilation and confirmation the boiler is operating safely with no risk of carbon monoxide.
• Written service report. The engineer signs off the service in your boiler’s log book or manual and provides a report. This is the document your manufacturer will ask to see if you ever make a warranty claim.

Where your money actually goes

It helps to understand why a service costs what it does, because it makes suspicious quotes easier to spot in either direction. The parts and consumables for a routine service are tiny, often just £4 to £6. Almost all of the cost is the engineer’s time and the overheads behind it.

A self-employed Gas Safe engineer typically charges £35 to £60 an hour, but out of that they cover van costs, insurance, ongoing training, Gas Safe registration (around £268 a year), and annual recalibration of their flue gas analyser (£80 to £120 a year). A national chain usually charges more than a local independent, but in our assessment that premium mostly reflects marketing and customer-acquisition costs rather than a better engineer turning up at your door. The person doing the work is often a similarly qualified local engineer either way.

What makes a service more expensive

Five factors explain most of the price variation you will see between quotes:

• Boiler type. Combi cheapest, oil dearest, as covered above.
• Region. London and remote rural areas cost more; the Midlands and North tend to be cheaper.
• Boiler age. Older boilers take longer to service and may need more checks, adding to the cost.
• One-off versus cover. A standalone service is cheaper up front; a cover plan costs more but bundles in breakdown support.
• Local versus national. National chains generally charge more than local independents for the same underlying work.

The real cost of skipping a service

The most expensive boiler service is the one you never book. Skipping the annual service to save around £100 routinely costs homeowners several times that within a year or two, in three ways:

• Warranty invalidation. Worcester Bosch, Vaillant, Ideal, Baxi and others all require an annual service by a registered engineer to keep their multi-year warranties (typically 5 to 12 years) valid. A single missed service can void cover that would otherwise have paid for a £600 to £1,200 part replacement, and the manufacturer is entitled to ask for your service records before paying out.
• Higher running costs. An unserviced boiler typically runs noticeably less efficiently over time. On a typical UK gas bill, that lost efficiency can quietly add well over £100 a year, every year, dwarfing the cost of the service that would have prevented it.
• Bigger repair bills. A service catches small faults before they become breakdowns. The alternative is an emergency call-out, which in 2026 typically costs £200 to £350 (evenings and weekends cost more), plus whatever the repair itself comes to.

There is also the safety dimension: the flue gas analysis and ventilation checks in a service are what confirm your boiler is not producing dangerous carbon monoxide. For more on how regular servicing affects how long your boiler lasts, see our boiler lifespan guide.

When to book, and how to save

The cheapest and easiest time to book your annual boiler service is late summer or early autumn, before the cold weather arrives and before engineers get busy with winter breakdowns. Booking off-season can get you a better price and a calmer appointment, and means any faults are caught before you are relying on the heating daily.

To get a fair price, compare two or three quotes from Gas Safe registered engineers, and remember the cheapest is not always the best value, particularly if corners are being cut on the flue gas test. Local independents are often cheaper than national chains for the same work. If you are a landlord, you are legally required to have an annual gas safety check (a CP12) on all gas appliances, and many landlords combine that certificate with a full service to save time and money.

Common questions about boiler service costs

How much does a boiler service cost in 2026?

A standard annual gas boiler service costs £80 to £120 in 2026, with around £100 a realistic UK average. Combi boilers tend to be cheapest, oil boilers cost more (around £140), and London prices run up to 25% higher than the national average. A monthly cover plan that bundles the service with breakdown support costs roughly £8 to £13 a month.

How often should I service my boiler?

Once every 12 months, carried out by a Gas Safe registered engineer for a gas boiler or an OFTEC engineer for oil, as we cover in our guide on how often you should service a boiler. Annual servicing is also a condition of keeping most manufacturer warranties valid, and it catches small faults before they turn into expensive breakdowns.

Is a boiler service a legal requirement?

For homeowners, no, there is no legal obligation to service your own boiler, although skipping it usually invalidates the manufacturer warranty. For landlords it is different: an annual gas safety check on all gas appliances is a legal requirement, and many landlords combine that certificate with a full service.

What is included in a boiler service?

A proper service includes a visual inspection, an internal component check and clean, a flue gas analysis (the most important test), a gas pressure and tightness test, safety and ventilation checks, and a written service report signed off in your boiler’s log book. The flue gas analysis is the part that confirms the boiler is burning safely, so any service that omits it is not a real service.

Can I service my own boiler?

No. Servicing a gas boiler requires a Gas Safe registered engineer with a calibrated flue gas analyser, and it is not legal or safe for an unqualified person to work on a gas appliance. You can keep your boiler healthy between services by checking the pressure, bleeding radiators and keeping the area clear, but the service itself must be done by a professional.

Is a one-off service or a cover plan better value?

It depends on the boiler. A one-off annual service (£80 to £120) is usually cheaper over time on a newer, reliable boiler. A cover plan (£8 to £13 a month) costs more but bundles in breakdown and repair support, which can be worth the predictability on an older boiler more likely to need repairs. Check whether a plan excludes parts on older boilers before committing.

This guide was last updated in June 2026. Cost figures are typical 2026 UK ranges and vary by boiler type, region, engineer and any repairs found, which are charged separately. A gas boiler must be serviced by a Gas Safe registered engineer; an oil boiler by an OFTEC registered engineer. We are not a credit broker, lender or installer. Heatable and BOXT handle quoting, finance and installation directly.