£100–£400 for small repairs, £2,000–£4,500 for a new boiler, £4,000–£8,000 for a full heating system
This is the UK guide range. Final quotes in London vary based on demand, access, parking/logistics, property type, and service scope.
Typical timeline: Same day for small repairs, 1–2 days for a boiler swap, 1–2 weeks for a full heating system
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London's diverse housing stock ranges from Georgian terraces and Victorian conversions to modern developments. Many properties fall within conservation areas, requiring specialist knowledge of local planning requirements.
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Confirm Gas Safe registration for any gas work (boilers, hobs, fires)
Ask about warranty cover on both parts and labour
Check for experience with your boiler type or heating system
Look for verified customer reviews mentioning reliability and aftercare
Ensure they provide a Gas Safety Certificate after any gas work
Modern boilers typically last 12–15 years. If your boiler is over 10 years old and efficiency has dropped below 85%, or you are facing frequent breakdowns, replacement is usually more cost-effective than ongoing repairs.
Gas Safe is the official UK register for gas engineers. Only Gas Safe registered engineers are legally allowed to work on gas appliances such as boilers, cookers, and fires. You can verify registration at GasSafeRegister.co.uk.
Combi boilers suit smaller homes with 1–2 bathrooms — no tank needed. System boilers suit larger homes with multiple bathrooms, using a hot water cylinder. Conventional boilers suit older properties with existing gravity-fed systems.
A powerflush typically costs £350–£600 depending on the number of radiators. It cleans sludge and debris from your central heating system, improving efficiency and extending the life of your boiler.
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