London · Greater London · England

Boiler Installation in London

Quote online, pick your boiler and have a Gas Safe registered engineer install it at your London home or flat – next-day fitting is often possible. Replacement gas boilers in London cover combi swaps, system and conventional boilers, back boiler removals and full heating upgrades, with finance available to spread the cost.

Gas Safe registered engineers
Next-day installation often available
Old boiler removed & disposed of
Finance to spread the cost

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Boiler Brands We Install in London

London homes range from mansion-block flats to Victorian terraces and large suburban houses, and the right boiler depends on space, flue options and hot water demand. Across our London boroughs we install Worcester Bosch, Vaillant, Ideal, Baxi and Viessmann boilers.

Flats and converted houses usually need a compact combi with a carefully planned flue, and the Baxi 800 series fits inside a standard kitchen cupboard. Victorian and Edwardian terraces with a loft tank are often converted to a combi or a system boiler. Parking and access can be tricky in central areas, so we plan the installation day in advance.

How Much Does a New Boiler Cost in London?

Boiler prices in London depend on the property as much as the postcode. Flats may need a compact combi and a carefully routed flue, while larger terraces and extended homes often need a system boiler and cylinder. Flue length, pipework condition, and your choice of controls all move the final figure. Like-for-like combi swaps start from £1,759 fitted, while Worcester Bosch Greenstar 4000 packages start from around £2,450. What you see online is what you’re charged. No surprise extras on the day.

Installation type	What’s involved	Price from	Time on site
Like-for-like combi swap	Replace an existing combi in the same position, with new flue, filter and controls	£1,759	1 day
Conventional or system to combi	Remove tanks and cylinder, cap off pipework, fit combi and upgrade gas supply if needed	£2,350	1–2 days
Back boiler replacement	Remove back boiler and fire, make good, fit new boiler in a new location	£2,795	2+ days
System boiler with cylinder	Suited to larger homes with multiple bathrooms; new or replacement unvented cylinder	£2,995	1–2 days
Boiler relocation	Move the boiler to a loft, garage or new room with new gas, flue and condensate runs	£2,250	1–2 days

These are starting prices for a standard installation by a Gas Safe registered engineer; your online quote confirms the exact cost for your home.

Boiler Finance in London

Get a new boiler on finance in London from £23.26 a month. As an example, a £1,799 boiler spread over 10 years at 9.9% APR works out at £23.26 per month. Shorter terms plus interest-free and buy now, pay later options are available, subject to status. See our boiler finance options for the full details.

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Choosing the Right Replacement Boiler for Your London Home

There is no single best boiler for London. The right choice depends on whether you live in a flat or a house, how many bathrooms you have and how much hot water you use.

Flats & maisonettes

A compact combi boiler is usually the best fit, giving instant hot water without a cylinder or loft tanks. We check flue routes and pressure before recommending one.

Terraces & family houses

Larger houses with two or more bathrooms usually suit a system boiler with an unvented cylinder, which delivers strong hot water pressure to several taps.

Extended & loft-converted homes

Extensions and loft conversions add demand. We size the output to the whole home, not just the original rooms, so winter heating keeps up.

Why London Homeowners Choose Boilers2Go

Fixed Prices, No Surprises

The price you see in your online quote for a replacement boiler in London is the price you pay. No padding goes into the figure. The engineer won’t add anything you haven’t agreed.

Gas Safe Registered Engineers

Your engineer in Greater London will be Gas Safe registered, and you can ask to see their ID card before they start.

Warranties That Go the Distance

You get the manufacturer’s warranty on the new boiler. You don’t need to register it – we do that after commissioning.

A Team That Picks Up the Phone

A real person guides you through every step, from choosing a model to aftercare. That keeps a stressful job manageable.

Efficient Boilers for Older Homes

An A-rated condensing boiler wastes far less heat than a non-condensing one, so running costs can come down.

Heating Down? Next-Day Slots

Should your boiler break down in a London winter, you move straight to the front of the queue – often fitted in 24 hours. Just tell us when you book.

Monthly Payment Plans

Spreading the cost is possible with interest-free, low-APR or buy now, pay later plans. Monthly costs are listed lower on this page.

Local Engineers, National Backing

You’ll have engineers who work around London, Croydon, Barnet and Ealing, plus a nationwide network if you need support further afield.

Local boiler installers

New Boilers Fitted Across London & Greater London

London is a patchwork of Victorian terraces, mansion blocks, converted flats, 1930s suburban semis and new developments, often within a few streets of each other. The right boiler for a one-bedroom flat in a converted house is a very different job from a four-storey terrace or a detached home on the edge of the capital.

That mix is why a straight online price only works when the survey behind it is proper. When we price new boiler installation in London we look at the property type, where the boiler sits, how the flue exits and how much hot water the household uses, then give you a fixed price for a boiler that fits.

Pick your boiler and an installation date online and a Gas Safe registered engineer arrives to strip out the old unit, fit and commission the new one, register the warranty and notify Building Control. We work around parking permits, loading restrictions and building access, so the day runs to plan.

London at a glance

Postcodes: Greater London, across the E, N, NW, SE, SW and W postcode areas
Council: Your local borough council – 32 boroughs plus the City of London
Water supplier: Mostly Thames Water – very hard water, so we check your postcode
Gas network: Cadent Gas in north, west and east London, SGN in much of the south. Smell gas? Call the National Gas Emergency line on 0800 111 999
Conservation areas: Many across the boroughs – we flag any at survey
Typical fit: One day for most like-for-like boiler swaps

What to Know Before Replacing a Boiler in London

London homes vary street by street, from basement flats to Edwardian terraces and 1930s semis. These are the points our engineers raise most often.

Very hard water

London tap water is very hard, well above the 200ppm level where Building Regulations guidance suggests protection. We fit a scale reducer with combi boilers so the heat exchanger lasts.

Flats & converted houses

Boilers in flats are often tucked into kitchen cupboards with limited flue routes. We survey the flue exit, ventilation and pipe runs before quoting.

Victorian & Edwardian terraces

Older terraces often carry original pipework and cramped boiler spots. We assess the system and fit a compact condensing boiler where space is tight.

Parking, permits & access

Resident permits, loading restrictions and shared entrances all affect an install day. We plan the job so the engineer can unload and work without delays.

Conservation areas & leasehold consent

Many boroughs have conservation areas, and leaseholders may need freeholder consent for flue changes. We flag both at survey, so there are no surprises.

Basement & lower-ground flats

Lower-level homes need condensate drained safely and boilers positioned above flood-prone areas where possible. We plan the route before fitting.

Fitting Replacement Boilers Across London & Greater London

Our Gas Safe engineers cover homes across Greater London, from the outer suburbs of Croydon, Barnet and Harrow to flats and terraces nearer the centre. See all our service areas.

Red pin: London town centre. Green pins: nearby towns we cover — tap a pin to see how far each town is from London. The shaded circle shows roughly 8 miles around London.

Areas we cover near London

WestminsterSW1 · ~1 mi
CamdenNW1 · ~3 mi
IslingtonN1 · ~3 mi
HackneyE8 · ~5 mi
EalingW5 · ~9 mi
CroydonCR0 · ~11 mi
BromleyBR1 · ~11 mi
Chipping BarnetEN5 · ~12 mi
Enfield TownEN2 · ~12 mi
HarrowHA1 · ~12 mi
SuttonSM1 · ~12 mi
BexleyheathDA6 · ~14 mi
HaveringRM1 · ~16 mi
UxbridgeUB8 · ~18 mi

Nearest areas to London

Our London borough pages include Lambeth (about 3 miles), Wandsworth (about 4 miles), Brent (about 6 miles), Lewisham (about 6 miles), Waltham Forest (about 7 miles), Merton (about 7 miles), Ealing (about 8 miles), Richmond upon Thames (about 8 miles), Croydon (about 9 miles), Bromley (about 9 miles), Redbridge (about 9 miles), Enfield (about 10 miles), Harrow (about 10 miles), Kingston upon Thames (about 10 miles), Barnet (about 11 miles), Sutton (about 11 miles), Hounslow (about 11 miles), Bexley (about 12 miles), Havering (about 14 miles) and Hillingdon (about 15 miles), all measured from central London. Outside the capital, we also cover Brighton (about 47 miles) and Southampton (about 69 miles).

London neighbourhoods & nearby villages

Croydon
Bromley
Barnet
Enfield
Ealing
Hillingdon
Harrow
Sutton

Boiler Installation London: FAQs

Often as soon as the next day, depending on the boiler you choose and engineer availability in the Greater London area. Complete the online quote, select a date that fits, and if there’s no heating or hot water we prioritise your booking.

We cover homes across Greater London, including Croydon, Bromley, Barnet, Enfield, Ealing, Hillingdon, Bexley, Havering, Harrow and Sutton. We are part of a nationwide network of Gas Safe engineers, so we can cover the wider area as well.

London tap water is very hard, typically well above 200ppm. You can check your exact postcode on your water supplier’s hardness checker. Where hardness is above 200ppm, we fit a scale reducer with a combi boiler in line with Building Regulations guidance.

Yes. We strip out the back boiler and fire, seal the old flue and pipework, and make everything safe before the new boiler goes in. We then fit a modern condensing combi or system boiler somewhere that suits the layout better. Allow a little longer than for a straight swap. The timescale is agreed with you beforehand.

A boiler replacement is notifiable work under Building Regulations, and your Gas Safe registered engineer notifies Building Control for you, so you receive a compliance certificate afterwards. Planning permission is not normally needed for a like-for-like swap. In a flat or a conservation area, check with your landlord, freeholder or borough council first if a new flue is needed on a front-facing wall. We flag it at survey.

Yes. Boiler finance in London includes interest-free, 9.9% APR and buy now, pay later options, with deposits from £0 – see our boiler finance page. All finance is subject to status.

Yes. Disposal is included: your old boiler, and any tanks or cylinder no longer needed after a combi conversion, are removed safely.

All boilers we install come with a manufacturer-backed warranty, typically between 5 and 10+ years depending on the model. Keeping it valid usually means an annual service – our boiler cover plans take care of that for you.

Yes. If there’s no mains gas at your property, we can fit an oil or LPG replacement. The right engineer does the right fuel: OFTEC registered for oil, Gas Safe registered with LPG competence for LPG. See our oil boiler installation and replacement and LPG boiler installation and replacement pages for more detail.

Ready for a New Boiler in London?

Tell us about your home, see fixed-price replacement boiler packages for London and book the installation date that suits you – all online, in a few minutes.

Get Your London Quote