Gas & Heating in London

Finding a Gas and Heating Engineer in London

London homeowners have a higher-than-average reliance on gas central heating, with millions of properties served by ageing boiler systems that require regular servicing and eventual replacement. The capital also has a growing number of properties switching to heat pumps as part of broader decarbonisation targets, and finding an engineer qualified in both technologies is increasingly valuable. All gas work in London must be carried out by a Gas Safe registered engineer — there are no exceptions, regardless of the job size.

What to Expect on Price

Annual boiler service costs in London range from £80 to £140, with combination boilers typically at the lower end and system or heat-only boilers slightly higher. A new boiler installation (supply and fit) runs £2,000–£4,500 depending on boiler type, brand, and whether pipework modifications are required. Landlord gas safety certificates (CP12) cost £60–£100 per property. Air source heat pump installations typically range from £8,000 to £14,000 before any Boiler Upgrade Scheme (BUS) grant, which can reduce costs by £7,500.

Tips for Hiring

Always verify Gas Safe registration at gassaferegister.co.uk before any work begins — it is illegal for an unregistered person to carry out gas work and extremely dangerous. Ask for a full written quote itemising the boiler model, warranty terms, and scope of any associated pipework or flue modifications. For new boiler installations, check whether the engineer is manufacturer-approved, as this can extend the standard warranty from two years to up to ten years. Avoid any engineer who offers to bypass safety checks or commission a boiler without a full flue integrity test.