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Quick answer
Solid wall insulation can be funded under ECO4 and Warm Homes funding for eligible homes. Higher grant amounts often apply because the cost is higher than other insulation types.
Insulation applied to the inside (IWI) or outside (EWI) of walls in homes without a cavity — typically pre-1920s construction.
Materials, scaffolding (for EWI) and finishing add cost. Grants may not always cover the full price.
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A detailed survey is needed for damp, ventilation and structural suitability.
Use our checker, then arrange a survey with an approved installer.
DisclaimerThis page is for guidance only and does not guarantee eligibility. Final approval depends on the relevant scheme provider, local authority, installer assessment and property survey.
EWI may need consent in conservation areas or on listed buildings.
EWI usually takes 1-3 weeks; IWI per room.
IWI affects rooms one at a time. EWI is mostly external.
Most major schemes prioritise EPC D-G homes. If your rating is unknown, you can still use our checker and confirm later.
No. It is a guidance tool. Final eligibility is confirmed by the relevant scheme provider, council or approved installer.
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