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Double glazing in Portsmouth

£2,250 to £12,180 installed, and 50% of homes in the council area rated EPC D to G.

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By Home Energy Quotes · Updated September 2026 · Portsmouth, Hampshire

Double Glazing in Portsmouth

What double glazing costs in Portsmouth

4–6 windows

£2,250–£3,750

Saves up to £65 a year. Pays back in about 46 years.

Full house (most common)

£4,480–£7,080

Saves up to £111 a year. Pays back in about 52 years.

Large home package

£8,140–£12,180

Saves up to £159 a year. Pays back in about 64 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.

Portsmouth in numbers

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

50% of homes with an EPC in the Portsmouth council area are rated D to G, and the median energy score is 69, which is band C. At the 2021 Census, 75.8% of households in the Portsmouth council area used mains gas as their only central heating, 0% oil only and 11.5% electricity only.

Portsmouth council areaFigureSource
Homes with an EPC rated D to G50%ONS, EPCs lodged to March 2025
Median EPC energy score69 (band C)ONS, EPCs lodged to March 2025
Households on mains gas heating only75.8%Census 2021, ONS
Electricity network operatorSSEN Distribution (Southern England)NESO licence area boundaries

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

Grants and funding in Portsmouth

No general glazing grant

There is no general grant for double glazing in Portsmouth, 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

Portsmouth leads a Warm Homes: Local Grant consortium allocated £34,807,254 in principle for April 2025 to March 2028. Income and EPC rules apply.

Source: DESNZ, list updated July 2026

Is Portsmouth a good place for double glazing?

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

Portsmouth has a population of 214,000, and the area falls within the South East region. We recommend getting at least 3 quotes to compare prices.

Portsmouth

Find Installers in Portsmouth

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 Portsmouth

  • Qualifications — check the installer holds relevant qualifications and certifications for double glazing before signing any contract
  • Local references — ask for completed jobs in Portsmouth or Hampshire
  • 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
Double Glazing installer in Portsmouth

Questions about double glazing in Portsmouth

How much does double glazing cost in Portsmouth?
Double Glazing in Portsmouth costs between £2,250 and £12,180 installed, depending on system size. A typical mid-range system costs around £6,420 including installation and VAT (modelled estimate).
How energy efficient are homes in Portsmouth?
50% of homes with an EPC in the Portsmouth council area, which covers Portsmouth, are rated D to G, and the median energy score is 69, which is band C.
Is there a grant for double glazing in Portsmouth?
There is no general grant for double glazing in Portsmouth, 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.
How long is the payback period in Portsmouth?
The estimated payback period in Portsmouth is typically around 62 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 Portsmouth?
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 Portsmouth before installation.
How do I find a good installer in Portsmouth?
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 Portsmouth

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

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Portsmouth on the map

Map of Portsmouth, Hampshire
Portsmouth, Hampshire and the surrounding area.

Double Glazing 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.