Double glazing in London

Q: How much does double glazing cost in London?

Double Glazing in London typically costs between £2,180 and £11,830 installed, depending on system size (modelled estimate). A typical mid-range system costs around £6,230. Actual costs vary depending on property and installer.

Q: How long is the payback period in London?

The estimated payback period in London is typically around 60 years, based on estimated savings of up to £104 a year for a typical home. Actual payback depends on your number of windows, property size and current glazing type.

Q: 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.

£2,180 to £11,830 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

What double glazing costs in London

4–6 windows

£2,180–£4,100

Saves up to £67 a year. Pays back in about 47 years.

Full house (most common)

£4,700–£7,270

Saves up to £117 a year. Pays back in about 51 years.

Large home package

£7,970–£11,830

Saves up to £164 a year. Pays back in about 60 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.

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. 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.

Westminster council area	Figure	Source
Homes with an EPC rated D to G	36%	ONS, EPCs lodged to March 2025
Median EPC energy score	71 (band C)	ONS, EPCs lodged to March 2025
Households on mains gas heating only	56.2%	Census 2021, ONS
Electricity network operator	UK 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 glazing grant

There is no general grant for double glazing in London, and windows do not qualify for 0% VAT. Councils delivering the Warm Homes: Local Grant can include double glazing in upgrades for eligible lower-income homes with an EPC rating of D to G.

Source: GOV.UK — Warm Homes: Local Grant

Standard VAT

Double glazing is 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 double glazing?

The area’s housing stock includes a range of properties suited to double glazing installations throughout London. Combined with South East’s energy prices, double glazing 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.

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 double glazing 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

Questions about double glazing in London

How much does double glazing cost in London?

Double Glazing in London costs between £2,180 and £11,830 installed, depending on system size. A typical mid-range system costs around £6,230 including installation and VAT (modelled estimate).

How energy efficient are homes in London?

36% of homes with an EPC in the Westminster council area, which covers London, are rated D to G, and the median energy score is 71, which is band C.

Is there a grant for double glazing in London?

How long is the payback period in London?

The estimated payback period in London is typically around 60 years, based on estimated savings of up to £104 a year for a typical home. Actual payback depends on your number of windows, property size and current glazing type.

Do I need planning permission in London?

Most double glazing 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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Double Glazing in nearby towns

Last reviewed: 15 September 2026. Costs are modelled estimates from the Home Energy Quotes Cost Index — see how we calculate them. Grant rates are checked against GOV.UK.