If you’ve been wondering how much a boiler service costs in the UK, you’re in good company. It’s one of those household jobs everyone knows they should book, yet most of us quietly put it off until the heating starts making worrying noises in late November. The short answer: expect to pay somewhere between £70 and £120 for a standard one-off service, depending on where you live, what type of boiler you have, and who does the work.

I’ve had my own combi boiler serviced every autumn for the past six years, and I’ve watched the price creep from £65 to £95 over that time. Friends in London tell me they pay £120–£140 without blinking, while my brother in Sheffield gets his done for £75 by the same independent engineer he’s used for a decade. That regional spread is completely normal — as with every trade in Britain, where you live matters almost as much as what needs doing.

What surprises most people is how much the price varies between types of provider. The big energy companies, the local heating firm, and the one-man-band Gas Safe engineer down the road can quote wildly different figures for what is, on paper, the same job. Understanding why — and what’s actually included — is the key to not overpaying.

How much does a boiler service cost in the UK on average?

Here’s what you’ll typically see quoted in 2026, based on going rates across the country:

  • Independent Gas Safe engineer: £70–£100. Often the best value. Many will throw in small extras like bleeding a radiator or checking your thermostat settings, and you’ll usually get the same engineer every year who learns your system’s quirks.
  • Local heating company: £85–£120. Slightly more, but you get the reassurance of an established firm with office staff, proper invoicing, and someone to call if there’s a problem afterwards.
  • Big energy suppliers: £100–£140 for a one-off service, though frankly they’d much rather sell you a monthly cover plan. Their servicing is competent, but you’re paying a brand premium.
  • Landlord gas safety check: £60–£90. Worth mentioning because people confuse the two — but a safety check is the legal minimum for rentals, not a full service.

That last point deserves emphasis. A landlord’s gas safety certificate (CP12) confirms your boiler won’t poison anyone with carbon monoxide or blow up. Important, obviously — but it’s not a service. A proper service cleans, tunes, and efficiency-tests the boiler so it runs cheaper and lasts longer. If you’re a homeowner, you want the service, not just the check.

What’s actually included in a full boiler service?

A proper service should take a competent engineer 45–60 minutes. Anything much quicker and corners are being cut. Here’s what should happen while they’re in your home:

  • Visual inspection of the boiler, pipework, and controls for damage, corrosion, or leaks
  • Checking the flue terminal and ventilation are clear and correctly fitted
  • Removing and cleaning the burner, heat exchanger, and condensate trap
  • Checking gas pressure, flow rate, and combustion with a flue gas analyser
  • Testing all safety devices, seals, and electrical connections
  • Firing the boiler up and checking it runs correctly through its cycle
  • A written service report detailing what was checked and any advisories

If your engineer is in and out in fifteen minutes with no analyser in sight, you haven’t had a service — you’ve had a very expensive cup of tea made at your expense. Don’t be shy about asking what’s included before you book.

What pushes the price up (and how to avoid it)

Several factors nudge quotes towards the top of the range. Boiler type matters: combis are usually cheapest to service, while system and conventional boilers with separate cylinders and tanks take longer and cost more. Location matters enormously — London and the South East routinely run 30–40% above the national average. Age and condition matter too: a fifteen-year-old boiler that’s never been serviced may need seals or electrodes replacing, which gets added to the bill.

And then there’s timing, the factor most people overlook. Ring up during the first cold snap of December, when every engineer in the county is drowning in breakdown callouts, and you’ll pay peak rates for a rushed job. Book in June or July and you’ll often get a better price, a more relaxed engineer, and your pick of appointment times. I book mine the same week every August. Boring? Yes. Cheap and hassle-free? Also yes.

One-off service vs monthly cover plans: which is better value?

This is the decision that trips most people up, because the big suppliers market their cover plans relentlessly. Typical plans cost £15–£30 a month — that’s £180–£360 a year — and bundle an annual service with breakdown cover and sometimes parts and labour.

For a newer boiler still under warranty (most come with 5–10 years these days), a cover plan is usually poor value. The warranty already covers breakdowns, so you’re paying £240 a year for an £85 service. Just book the standalone service and pocket the difference.

For an older boiler (8+ years) out of warranty, the maths changes. A single replacement part — a fan, a pump, a PCB — can cost £250–£400 fitted. If your boiler is getting temperamental, a cover plan starts to look sensible. But read the small print like your wallet depends on it, because it does: many plans have annual claim limits, exclude sludge and limescale damage (the most common causes of breakdowns), impose 30-day waiting periods before you can claim, and won’t cover boilers over a certain age at all.

There’s also a middle option people forget: home emergency cover from your home insurance provider, often £5–£10 a month as an add-on, which covers the “no heating in January” nightmare without the full-service-plan price tag.

Before you book anyone, verify they’re legitimate. It’s illegal for unregistered engineers to work on gas in the UK, so check every engineer on the Gas Safe Register and ask to see their ID card when they arrive. The Which? guide to getting the best boiler service is also worth ten minutes of your time.

Simple ways to keep the cost down year after year

A few habits that have saved me real money. Book in summer — quieter diaries mean keener prices. Get two or three quotes; I’ve seen £50 differences for the same job on the same street. Ask if the quote is fixed — some engineers charge extra if parts need replacing, and you want to know that before they start, not after. Build a relationship with a good independent engineer; regulars get priority booking and honest advice about when a repair is worth it versus when it’s time for a new boiler.

Finally, keep your service paperwork. A stamped annual service history keeps manufacturer warranties valid, genuinely helps when selling your house (buyers’ solicitors do ask), and gives any future engineer a proper history to work from instead of guessing.

If you’re budgeting for the rest of the house too, compare notes with the cost of installing a home CCTV system in the UK — another job where multiple quotes save serious money. And if your radiators never quite heat the far rooms, you may also want to look at improving Wi-Fi signal in an old house with thick walls, since old houses tend to come with both heating and connectivity quirks.

The takeaway: budget £80–£100 for a proper annual service from a Gas Safe engineer, book it in the summer months, and think twice before signing up for an expensive cover plan — it only pays off for older, out-of-warranty boilers. A well-serviced boiler runs more efficiently, breaks down less often, and can easily give you 12–15 years of faithful service. It’s the cheapest insurance your heating system will ever have.