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AnswerHow much does external solid wall insulation cost?
External solid wall insulation typically costs £8,000–£22,000 in the UK and saves around £300–£600 a year on heating, with payback of about 10–20 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 | £8,000–£22,000 (for solid-wall / period homes) |
|---|---|
| Annual saving | £300–£600 |
| Payback | 10–20 years |
2026 figures, based on Energy Saving Trust, Ofgem & gov.uk data · always confirm with a professional survey.