How Much Does a Boiler Service Cost in 2026?

A boiler service typically costs £60-120 for a one-off visit from a local Gas Safe engineer, with an average of around £87. National providers like British Gas charge £99 for a one-off service. Prices vary by region, boiler type, and whether you choose a local or national company. London and the South East are most expensive (£100-150), while the North East and Wales tend to be cheaper (£65-110).

It depends on your boiler age and financial buffer. For boilers under 7 years old still under warranty, a one-off annual service (£60-120) is usually better value than a cover plan (£7-25/month). For boilers aged 7-15 years, cover plans become worth it because breakdown risk increases. For boilers over 15 years, consider replacing. If you have no savings buffer for a £300-500 repair bill, a cover plan provides peace of mind. See our full cover plan comparison.

Once a year, ideally in summer (May-August) when engineers are less busy. All major boiler manufacturers require annual servicing to keep your warranty valid. Landlords are legally required to have gas appliances checked annually (CP12 certificate). Homeowners are not legally required to service their boiler, but skipping it risks voiding the warranty, reducing efficiency by 10-15%, and increasing breakdown risk. Read more on how often to service your boiler.

A standard boiler service includes: visual inspection of the boiler and flue, gas pressure and flow rate tests, flue gas analysis using an electronic analyser, burner inspection and cleaning, heat exchanger check, seal and gasket inspection, condensate trap check, safety device tests, system pressure check, and thermostat testing. You should receive a written service report with all readings and the engineer Gas Safe registration number. The whole process takes 30-60 minutes. See the full checklist of what is included.

Missing your annual boiler service has real consequences. First, your manufacturer warranty will be voided - losing a 5-12 year warranty can cost thousands if a major fault develops. Second, efficiency drops 10-15% without regular cleaning, adding £50-100 per year to your gas bills. Third, carbon monoxide risk increases as components degrade without inspection. Fourth, home insurance may not cover boiler-related damage without service records. After 3-5 missed services, breakdown risk increases significantly.

A boiler service (£60-120) focuses on efficiency and maintenance - the engineer cleans components, tests performance, and ensures the boiler runs optimally. A CP12 gas safety check (£60-90) is a safety certification confirming gas appliances are safe to use - it checks for gas leaks and safety hazards. Landlords need both annually; the checks can often be combined for around £80-110. Homeowners only need a service, not a CP12. Read our landlord CP12 guide.

No. Under the Gas Safety (Installation and Use) Regulations 1994, only Gas Safe registered engineers can legally work on gas boilers. DIY servicing is illegal and extremely dangerous - gas leaks and carbon monoxide are life-threatening. What you CAN do yourself: check the pressure gauge (should be 1-1.5 bar), bleed radiators if they have cold spots at the top, check for visible water leaks around pipework, and test your carbon monoxide alarm monthly.

Summer months (May-August) are the best time to book. Engineers are less busy, so you get more appointment choice and some offer slightly lower prices. Avoid October through January when demand peaks before winter. Booking a slot in June or July - when most people are thinking about holidays not boilers - often means faster availability and can save £10-15 compared to autumn peak pricing.