Home insulation in Portsmouth
£546 to £8,506 installed, and 50% of homes in the council area rated EPC D to G.
What insulation costs in Portsmouth
Loft only
£546–£1,302
Saves up to £233 a year. Pays back in about 4 years.
Loft + cavity walls (most common)
£2,148–£5,121
Saves up to £478 a year. Pays back in about 7 years.
Full package
£3,567–£8,506
Saves up to £546 a year. Pays back in about 10 years.
Source: Home Energy Quotes Cost Index, costs modelled September 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. Portsmouth leads a Warm Homes: Local Grant consortium allocated £34,807,254 in principle for April 2025 to March 2028.
| Portsmouth council area | Figure | Source |
|---|---|---|
| Homes with an EPC rated D to G | 50% | ONS, EPCs lodged to March 2025 |
| Median EPC energy score | 69 (band C) | ONS, EPCs lodged to March 2025 |
| Warm Homes: Local Grant, 2025 to 2028 | £34,807,254 to the consortium led by Portsmouth | DESNZ, list updated July 2026 |
| Households on mains gas heating only | 75.8% | Census 2021, ONS |
| Electricity network operator | SSEN 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.
Is Portsmouth a good place for home insulation?
The area’s housing stock includes a range of properties suited to home insulation installations throughout Portsmouth. Combined with South East’s energy prices, home insulation 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.
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.
What to check before hiring an installer in Portsmouth
- Qualifications — check the installer holds relevant qualifications and certifications for home insulation 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
Questions about home insulation in Portsmouth
How much does home insulation cost in Portsmouth?
How energy efficient are homes in Portsmouth?
Is there a grant for home insulation in Portsmouth?
The Warm Homes: Local Grant may fund insulation and low-carbon heating in Portsmouth for homes in England with an EPC rating of D to G, where household income is usually £36,000 or less or someone receives certain benefits.
How long is the payback period in Portsmouth?
Do I need planning permission in Portsmouth?
How do I find a good installer in Portsmouth?
Get quotes for your home in Portsmouth
Up to three approved installers who cover Portsmouth may contact you. Free, no obligation.
Portsmouth on the map
Home Insulation 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.