Independent costs, scores and savings data for cavity wall insulation in the UK. Free comparison tool and local installer matching.
Cavity wall insulation is injected into the gap between the inner and outer walls of homes built after approximately 1920. It addresses up to 35% of heat loss. A professional survey is essential before installation to confirm cavity suitability — not all cavities are suitable.
| Factor | Detail |
|---|---|
| Our Independent Score | 6.0/10 |
| Typical Cost (semi-det) | £400–£800 |
| Annual Energy Saving | £150–£250/yr |
| Payback Period | 2–5 years |
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