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Boilers in London

£1,680 to £5,880 installed, and 36% of homes in the council area rated EPC D to G.

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By Home Energy Quotes · Updated September 2026 · London, Greater London

Boilers in London

What a new boiler costs in London

24–30kW combi

£1,680–£2,560

Saves up to £162 a year. Pays back in about 13 years.

35–40kW system (most common)

£2,670–£3,440

Saves up to £231 a year. Pays back in about 13 years.

40kW+ heat-only

£3,980–£5,880

Saves up to £317 a year. Pays back in about 16 years.

Source: Home Energy Quotes Cost Index, costs modelled March 2026, savings at the October to December 2026 price cap. Prices are estimates and include installation and VAT. Actual costs may vary.

London in numbers

Published statistics for the Westminster council area, not our estimates.

At the 2021 Census, 56.2% of households in the Westminster council area used mains gas as their only central heating, 0.5% oil only and 18.5% electricity only. 36% of homes with an EPC in the Westminster council area are rated D to G, and the median energy score is 71, which is band C.

Westminster council areaFigureSource
Households on mains gas heating only56.2%Census 2021, ONS
Households on oil heating only0.5%Census 2021, ONS
Households on electric heating only18.5%Census 2021, ONS
Homes with an EPC rated D to G36%ONS, EPCs lodged to March 2025
Median EPC energy score71 (band C)ONS, EPCs lodged to March 2025
Electricity network operatorUK Power Networks (London)NESO licence area boundaries

These are published official statistics for the Westminster council area, which covers London, not Home Energy Quotes estimates. Sources checked 6 October 2026.

Grants and funding in London

No general boiler grant

There is no general government grant for a like-for-like gas or oil boiler replacement in London, and the Warm Homes: Local Grant cannot fund new gas boilers. If you switch to a heat pump instead, the Boiler Upgrade Scheme offers up to £7,500.

Source: GOV.UK — Boiler Upgrade Scheme

Standard VAT

Boilers are not on HMRC's list of energy-saving materials, so 20% VAT applies and is inside the prices above.

Source: HMRC — VAT Notice 708/6

Warm Homes: Local Grant

The council is part of a Warm Homes: Local Grant consortium led by Greater London Authority, allocated £53,470,024 in principle across the consortium for April 2025 to March 2028. Income and EPC rules apply.

Source: DESNZ, list updated July 2026

Is London a good place for boilers?

The area’s housing stock includes a range of properties suited to boilers installations throughout London. Combined with South East’s energy prices, boilers installations here may offer good value (individual results will vary).

London has a population of 8,900,000, and the area falls within the South East region. We recommend getting at least 3 quotes to compare prices.

London

Find Installers in London

We recommend getting at least 3 quotes from qualified installers before making a decision. Check reviews, ask for local references, and make sure warranties are clearly stated in writing.

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What to check before hiring an installer in London

  • Qualifications — check the installer holds relevant qualifications and certifications for boilers before signing any contract
  • Local references — ask for completed jobs in London or Greater London
  • Reviews — check online reviews before committing
  • Warranty — product and workmanship warranties should be clearly stated in writing
  • 3 quotes minimum — we recommend comparing at least three quotes to ensure you get a fair price
Boilers installer in London

Questions about boilers in London

How much do boilers cost in London?
Boilers in London cost between £1,680 and £5,880 installed, depending on system size. A typical mid-range system costs around £3,010 including installation and VAT (modelled estimate).
How are homes in London heated?
At the 2021 Census, 56.2% of households in the Westminster council area, which covers London, used mains gas as their only central heating, 0.5% oil only and 18.5% electricity only.
Is there a grant for boilers in London?
There is no general government grant for a like-for-like gas or oil boiler replacement in London, and the Warm Homes: Local Grant cannot fund new gas boilers. If you switch to a heat pump instead, the Boiler Upgrade Scheme offers up to £7,500.
How long is the payback period in London?
The estimated payback period in London is typically around 15 years, based on estimated savings of up to £202 a year for a typical home. Actual payback depends on your property size, boiler efficiency and gas tariff.
Do I need planning permission in London?
Most boilers installations fall under permitted development rights and do not require planning permission. However, listed buildings, conservation areas and flats may need approval. Always check with your local planning authority in London before installation.
How do I find a good installer in London?
We recommend getting at least 3 quotes from qualified installers. Check online reviews and verify that the installer holds relevant qualifications before signing any contract.

Get quotes for your home in London

Up to three approved installers who cover London may contact you. Free, no obligation.

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Boilers in nearby towns

Last reviewed: . Costs are modelled estimates from the Home Energy Quotes Cost Index — see how we calculate them. Grant rates are checked against GOV.UK.