Double glazing in Cardiff

Q: How much does double glazing cost in Cardiff?

Double Glazing in Cardiff typically costs between £1,950 and £10,220 installed, depending on system size (modelled estimate). A typical mid-range system costs around £5,300. Actual costs vary depending on property and installer.

Q: How do I find a good installer in Cardiff?

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.

£1,950 to £10,220 installed, and 42% of homes in the council area rated EPC D to G.

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By Home Energy Quotes · Updated September 2026 · Cardiff, South Glamorgan

What double glazing costs in Cardiff

4–6 windows

£1,950–£3,240

Saves up to £72 a year. Pays back in about 36 years.

Full house (most common)

£4,000–£6,460

Saves up to £120 a year. Pays back in about 44 years.

Large home package

£6,520–£10,220

Saves up to £172 a year. Pays back in about 49 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.

Cardiff in numbers

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

42% of homes with an EPC in the Cardiff council area are rated D to G, and the median energy score is 70, which is band C. At the 2021 Census, 78.4% of households in the Cardiff council area used mains gas as their only central heating, 0.1% oil only and 10.4% electricity only.

Cardiff council area	Figure	Source
Homes with an EPC rated D to G	42%	ONS, EPCs lodged to March 2025
Median EPC energy score	70 (band C)	ONS, EPCs lodged to March 2025
Households on mains gas heating only	78.4%	Census 2021, ONS
Electricity network operator	National Grid Electricity Distribution (South Wales)	NESO licence area boundaries

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

Is Cardiff a good place for double glazing?

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

Cardiff has a population of 362,000, and the area falls within the Wales region. We recommend getting at least 3 quotes to compare prices.

Find Installers in Cardiff

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 Cardiff

Qualifications — check the installer holds relevant qualifications and certifications for double glazing before signing any contract
Local references — ask for completed jobs in Cardiff or South Glamorgan
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 Cardiff

How much does double glazing cost in Cardiff?

Double Glazing in Cardiff costs between £1,950 and £10,220 installed, depending on system size. A typical mid-range system costs around £5,300 including installation and VAT (modelled estimate).

How energy efficient are homes in Cardiff?

42% of homes with an EPC in the Cardiff council area, which covers Cardiff, are rated D to G, and the median energy score is 70, which is band C.

Is there a grant for double glazing in Cardiff?

There is no general grant for double glazing in Cardiff, and windows do not qualify for 0% VAT. Green Homes Wales offers interest-free loans that can include high-performance glazing.

How long is the payback period in Cardiff?

The estimated payback period in Cardiff is typically around 51 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 Cardiff?

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 Cardiff before installation.

How do I find a good installer in Cardiff?

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 Cardiff

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

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Cardiff on the map

Cardiff, South Glamorgan and the surrounding area.

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.