Question 1

What type of insulation saves the most money?

Accepted Answer

Solid wall insulation typically saves the most (up to 25% of heating bills) but costs the most to install (GBP 5,000-14,000 for external, GBP 4,000-8,000 for internal). Loft insulation offers the best value -- saving around 20% of heating bills for just GBP 300-500 if your loft is accessible. Cavity wall insulation saves around 15% and costs GBP 500-1,500.

Question 2

Are there grants for home insulation in the UK?

Accepted Answer

The ECO4 scheme (running until March 2026) provides free or subsidised insulation for households on qualifying benefits or with low EPC ratings. The Great British Insulation Scheme targets homes in council tax bands A-D. Some local authorities offer additional grants. Check the Simple Energy Advice website for eligibility.

Question 3

How do I know what insulation my home already has?

Accepted Answer

Check your EPC certificate for insulation details. For loft insulation, look in your loft hatch -- you should see at least 270mm depth. For cavity walls (built 1920s-1990s), check if drill holes have been filled on exterior walls. Your local authority building control records may also show if insulation was installed.

Insulation Savings Calculator

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Insulation Savings Calculator

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