Cavity Wall Insulation
Typical Cost
£500–£1,500
EPC Score Impact
+8 to +15 points
Cavity wall insulation fills the gap between the inner and outer walls of your home with insulating material. Around a third of heat lost in an uninsulated home escapes through the walls. The process involves drilling small holes in the outer wall and injecting insulation material, which is then sealed. Most installations are completed in a few hours with minimal disruption.
Government funding may be available
The ECO4 scheme and Great British Insulation Scheme may cover the cost of cavity wall insulation for qualifying households — free of charge.
Check government grants available →Areas Where Cavity Wall Insulation Is Most Recommended
These postcode districts have the highest number of EPC certificates recommending cavity wall insulation.
| # | District | Area | Council | Recommended | Total Certs |
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