Home insulation in Cardiff
£458 to £7,139 installed, and 42% of homes in the council area rated EPC D to G.
What insulation costs in Cardiff
Loft only
£458–£1,093
Saves up to £233 a year. Pays back in about 3 years.
Loft + cavity walls (most common)
£1,802–£4,298
Saves up to £478 a year. Pays back in about 6 years.
Full package
£2,994–£7,139
Saves up to £546 a year. Pays back in about 8 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.
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.
| 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 home insulation?
The area’s housing stock includes a range of properties suited to home insulation installations throughout Cardiff. Combined with Wales’s energy prices, home insulation 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.
What to check before hiring an installer in Cardiff
- Qualifications — check the installer holds relevant qualifications and certifications for home insulation 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 home insulation in Cardiff
How much does home insulation cost in Cardiff?
How energy efficient are homes in Cardiff?
Is there a grant for home insulation in Cardiff?
How long is the payback period in Cardiff?
Do I need planning permission in Cardiff?
How do I find a good installer in Cardiff?
Get quotes for your home in Cardiff
Up to three approved installers who cover Cardiff may contact you. Free, no obligation.
Cardiff 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.