Cavity wall insulation grants
Quick answer
You may qualify for free or part-funded cavity wall insulation if your home has a suitable unfilled cavity, an EPC rating of D-G, and your household meets common income, benefits or vulnerability criteria.
What cavity wall insulation is
A material installed into the gap between the inner and outer walls of homes built with cavity construction (typically 1920s-1990s).
Which homes may be suitable
- Two-leaf brick or block construction
- Cavity at least around 50mm wide
- Walls in good condition with no damp issues
Not sure where you stand?
Get a free, no-obligation eligibility summary in under a minute.
Who may qualify for support?
Households on qualifying benefits, lower-income households via LA Flex, or homes with vulnerable occupants. EPC D-G is typically prioritised.
EPC and survey considerations
A pre-install survey checks construction, condition and ventilation. The work is recorded on the EPC at next assessment.
How to check
Run our checker, then book a free survey from 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
Will it cause damp?
A proper survey identifies homes where insulation is not suitable. Reputable installers refuse unsuitable jobs.
Can old cavity insulation be replaced?
Yes, but it is more involved. Specialist surveys are needed.
How long does install take?
Usually a single day for an average home.
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.
Start free check