Solid wall insulation grants

Quick answer

Solid wall insulation can be funded under ECO4, GBIS and Warm Homes funding for eligible homes. Higher grant amounts often apply because the cost is higher than other insulation types.

What solid wall insulation is

Insulation applied to the inside (IWI) or outside (EWI) of walls in homes without a cavity — typically pre-1920s construction.

Why it can be expensive

Materials, scaffolding (for EWI) and finishing add cost. Grants may not always cover the full price.

Who may qualify?

Households on qualifying benefits
Lower-income households
Homes with EPC D-G
Properties in lower Council Tax bands (GBIS)

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Internal vs external wall insulation

IWI — less external impact, but reduces interior space
EWI — better thermal performance, but changes external appearance and may need planning consent in conservation areas

EPC and survey considerations

A detailed survey is needed for damp, ventilation and structural suitability.

How to check

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.

Frequently asked questions

Do I need planning permission?

EWI may need consent in conservation areas or on listed buildings.

How long does install take?

EWI usually takes 1-3 weeks; IWI per room.

Is it disruptive?

IWI affects rooms one at a time. EWI is mostly external.

How does my EPC affect eligibility?

Most major schemes prioritise EPC D-G homes. If your rating is unknown, you can still use our checker and confirm later.

Does this checker guarantee funding?

No. It is a guidance tool. Final eligibility is confirmed by the relevant scheme provider, council or approved installer.

Check what you may qualify for

A free 60-second guided check covering ECO4, Warm Homes, insulation, heat pumps and solar.