London · Greater London · England

Boiler Installation in London

Get a fixed-price quote for a new boiler online and have a Gas Safe registered engineer fit it at your London home or flat – often as soon as the next day. 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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Replacement Gas Boilers in London: Our Popular Packages

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. Every quote you get online is fixed – 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, interest-free and buy now, pay later options are also available, all 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.

How Boiler Replacement in London Works

1 Enquire

Fill out our simple online enquiry form. We just need a few details about your home to give you quotes for new boilers online.

2 Choose

Select a gas boiler package that fits your specific needs. You have the option to pay up-front, or with instalments on finance.

3 Installation

Next you will be able to choose a convenient boiler installation date. One of our Gas Safe engineers will complete installation of your new boiler.

4 Aftercare

You can choose from one of our boiler servicing plans, giving you peace of mind and keeping your boiler running smoothly for years to come.

Why London Homeowners Choose Boilers2Go

Fixed Prices, No Surprises

The online quote for your replacement boiler in London is the price you pay. No padding, and no extras added once the engineer is through the door.

Gas Safe Registered Engineers

Every boiler in Greater London is fitted and commissioned by a Gas Safe registered engineer, who can show you their ID card before work begins.

Warranties That Go the Distance

Manufacturer-backed warranties come with your new boiler and are registered on your behalf once it has been commissioned.

A Team That Picks Up the Phone

From choosing a model to aftercare once the heating is running, a real person guides you through each step of replacing your boiler.

Efficient Boilers for Older Homes

Swapping an ageing non-condensing boiler for a modern A-rated one can cut fuel use – handy in draughty Victorian terraces and post-war semis alike.

Heating Down? Next-Day Slots

If your boiler packs up in a London winter, no-heating and no-hot-water bookings go to the front of the queue and are often fitted within 24 hours.

Monthly Payment Plans

Spread the cost with interest-free, low-APR or buy now, pay later options. Monthly prices are shown further down this page.

Local Engineers, National Backing

Fitted by engineers who work around London, Croydon, Barnet and Ealing, with a nationwide network behind them 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 Ealing (about 9 miles), Croydon (about 11 miles), Bromley (about 11 miles), Barnet (about 12 miles), Enfield (about 12 miles), Harrow (about 12 miles), Sutton (about 12 miles), Bexley (about 14 miles), Havering (about 16 miles) and Hillingdon (about 18 miles), all measured from central London.

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, pick a date that suits you, and if you have 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. As part of a nationwide network of Gas Safe engineers, we also cover the wider area.

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 remove the back boiler and associated fire, make the old flue and pipework safe, and install a modern condensing combi or system boiler in a more suitable position. This usually takes a little longer than a straight swap, and we’ll confirm the timescale before we start.

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. Your engineer will safely disconnect, remove and dispose of your old boiler, and any redundant tanks or cylinder if you’re switching to a combi.

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 your home is off the mains gas network, we can replace an oil or LPG boiler. Oil boilers are fitted by OFTEC registered engineers and LPG boilers by Gas Safe registered engineers with LPG competence. 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.

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