Gas Boilers · Greater London
Gas Boiler Quotes in London
Compare quotes from Gas Safe registered engineers for gas boiler installation, replacement, servicing and repairs in London flats, terraces and houses.
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Replacing a gas boiler in London is often less about the boiler and more about the building. In a converted flat, the questions are where the flue can go, whether the freeholder needs to approve it and how the engineer will get the old boiler down three flights of stairs. In a Victorian terrace, it's whether to keep the tanks in the loft or convert to a combi.
Describe your boiler, your home and what you'd like to change, and Gas Safe registered engineers who cover your borough can send you quotes for installation, replacement, servicing or repairs.
Flue routes and leasehold flats
Flue rules set minimum distances from windows, doors, gutters and boundaries. In tightly packed streets and mansion blocks, the position an old boiler used decades ago may not comply today, which can mean a vertical flue, a longer horizontal run or a plume management kit. Engineers will check this during the survey, so photos of the outside wall where the flue exits are especially useful.
If you own a leasehold flat, read your lease before booking: many require the freeholder's consent for changes to the building's exterior, which can include a new flue position. Listed buildings and some conservation areas can add further requirements.
Gas boilers jobs engineers in London are asked to quote for
Combi swaps in flats
Like-for-like replacements in kitchen and hallway cupboards, with compliant flue terminals.
Terraced house conversions
Replacing regular boilers, cylinders and loft tanks with a combi or a system boiler and unvented cylinder.
Landlord safety checks and servicing
Annual gas safety records and boiler services for rented homes across the capital.
What a quote usually covers
- Survey of your current boiler, pipework and gas supply
- Supply and fitting of the agreed boiler, flue and controls
- Draining, cleaning and refilling the system where included
- Commissioning, Benchmark checklist and registration
- Removal of the old boiler and a tidy finish
Every engineer prices differently, so check each quote line by line. Our gas boilers price guide shows indicative UK ranges.
Before the engineer visits
- Note the make, model and approximate age of your current boiler.
- Count your radiators and bathrooms, and check if you have a hot water cylinder or loft tanks.
- Take photos of the boiler, its pipework and the flue outside.
- Clear access to the boiler, the gas meter and the loft if there are tanks up there.
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Areas around London
Engineers taking on gas boiler work in London often also cover:
- Islington
- Hackney
- Camden
- Wandsworth
- Lambeth
- Lewisham
- Greenwich
- Walthamstow
- Hammersmith
- Barnet
- Croydon
- Enfield
- Romford
Gas boilers in London: common questions
How much does a new gas boiler cost in London?
London prices tend to sit towards the top of national ranges because of access, parking and travel time. A like-for-like combi replacement is often somewhere around £2,500–£4,000 fitted, with conversions and relocations costing more. Compare written quotes for your own property.
Can my boiler flue go out of the front of my London flat?
It depends on the distances to windows, doors and boundaries, and on any lease, listing or conservation-area restrictions. Engineers will check what's allowed during their survey.
How often should I service a gas boiler in London?
Once a year, as recommended by manufacturers. Landlords must also arrange an annual gas safety check for each gas appliance they provide.
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