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AnswerHow much does internal solid wall insulation cost?
Internal solid wall insulation typically costs £5,000–£15,000 in the UK and saves around £300–£600 a year on heating, with payback of about 8–15 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 | £5,000–£15,000 (fitted room-by-room inside) |
|---|---|
| Annual saving | £300–£600 |
| Payback | 8–15 years |
2026 figures, based on Energy Saving Trust, Ofgem & gov.uk data · always confirm with a professional survey.