Boiler service cost in the UK: 2026 prices and what you get

Quick answer: A one-off boiler service costs £80 to £120 for most UK homes in 2026, with around £100 the typical spend. British Gas charges £109; independent Gas Safe engineers often beat that. London prices run £90 to £130, the north nearer £70 to £100. The visit takes 40 to 60 minutes.

How much does a boiler service cost in 2026?

Outliers exist at both ends, ExpertSure’s data stretches from £60 to £140, but if a quote lands far outside the ranges above, ask what’s different about your boiler. Usually nothing is.

A few things genuinely move the price. Oil boilers cost a little more than gas because fewer engineers are OFTEC-registered for them. A first visit to an unfamiliar boiler often runs longer than a repeat customer’s. And access matters: a boiler buried in a loft cupboard takes more of the engineer’s hour than one at eye level in the kitchen. What shouldn’t move the price is the brand on the casing; a service is a service.

Timing helps too. Engineers are quiet from May to September and slammed from October onwards, so summer bookings are easier to get and occasionally cheaper. Book the service in the same month each year and the warranty paperwork stays tidy.

Around £100 is the honest national benchmark for a one-off gas boiler service in 2026.

What actually happens during the service?

British Gas describes it as inspecting the boiler and controls, opening the casing to check internal components, checking for corrosion and leaks, cleaning the system filter, and handing over a safety checklist with efficiency advice. The whole visit usually takes 40 to 60 minutes.

A service is preventive: if the engineer finds a fault, the repair is quoted separately. Don’t confuse the £100 with repair cover. We’ve walked through the visit step by step in what happens at an annual boiler service, including the questions worth asking while the casing is off.

Is a one-off cheaper than a monthly plan?

Put them side by side. A one-off is £109 or less, once a year. Hometree’s entry plan is £12.95 a month, £155 a year, with the service included plus repair cover. British Gas HomeCare is £22 a month, £264 a year.

While the boiler is under manufacturer warranty the answer is one-sided. Parts and labour are already the manufacturer’s problem, so a plan mostly duplicates cover you own. Pay for the service alone and bank the £45 to £155 difference.

Out of warranty, it turns on how often the boiler breaks. One paid repair a year makes the plan the cheaper route; a boiler that runs clean for three winters makes it a donation. The plan is repair insurance with a service stapled on, so price it against your boiler’s actual record, and read our full take on whether boiler cover is worth it before renewing anything.

Will skipping a service void the warranty?

Yes, and the brands write it plainly. Baxi requires registration within 30 days, a completed Benchmark checklist and an annual service, otherwise “the warranty will revert to the standard one year”. Vaillant requires the boiler to be “serviced annually by a Vaillant or other registered Gas Safe Registered engineer”, with the Benchmark logbook kept up to date.

So on a boiler inside a 7-to-12-year warranty, the £100 service works as an annual premium that keeps thousands of pounds of parts-and-labour cover alive. Miss one and you may be self-insuring a £2,000 appliance without realising. Our boiler warranty comparison covers each brand’s small print.

Engineers also check the system water during a service. Sludge damage is excluded by most warranties, which is the practical argument for a magnetic filter and the reason a good engineer looks at the filter before signing anything off.

Who’s allowed to service your boiler?

Gas work is restricted by law, and the HSE is blunt about it: landlords “must only use a Gas Safe registered engineer for maintenance and safety checks on gas equipment”. The same register applies to anyone paid to work on your boiler. Check the engineer’s Gas Safe ID card, front and back, before they touch anything.

Landlords carry a second duty: an annual gas safety check within 12 months of a new appliance and every year after, with the record kept for two years and a copy given to tenants within 28 days. That check is a safety inspection, and it isn’t a full service. HSE calls regular annual maintenance on top of it good practice, and most decent landlords book both in one visit.

FAQs

How long does a boiler service take?

40 to 60 minutes, per British Gas. Allow longer if the filter needs a proper clean or the engineer hasn’t seen the boiler before. Anything under 20 minutes wasn’t a service; it was a glance.

How often should a boiler be serviced?

Every 12 months. That’s the warranty condition for every major brand, and summer is the smart time to book, before engineers disappear into breakdown season.

Is a landlord gas safety certificate the same as a service?

No. The CP12 safety check confirms the appliance is safe to use; a service opens it up, cleans it and checks performance. Rented homes legally need the safety check every year; the service is what protects the boiler and the warranty.