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AnswerHow much does cavity wall insulation cost?
Cavity wall insulation typically costs £500–£1,500 in the UK and saves around £150–£400 a year on heating, with payback of about 3–5 years.
Insulation is the cheapest way to cut bills and is the smart first step before a heat pump — a warmer, tighter home needs a smaller, cheaper system.
| Cost | £500–£1,500 (for homes with a wall cavity) |
|---|---|
| Annual saving | £150–£400 |
| Payback | 3–5 years |
2026 figures, based on Energy Saving Trust, Ofgem & gov.uk data · always confirm with a professional survey.