Which insulation gives the best payback?
Loft insulation offers the fastest payback, often under 2 years, because it is cheap to install and heat loss through an uninsulated roof is substantial. Cavity wall insulation typically pays back in 2-3 years. Solid wall insulation is significantly more expensive with payback periods of 15-25 years, though it dramatically improves comfort and reduces carbon emissions.
Can I get free insulation from the government?
The Great British Insulation Scheme offers free or subsidised loft and cavity wall insulation for households with an EPC rating of D or below, or for those on means-tested benefits. The ECO4 scheme provides funding for solid wall insulation and other measures for eligible lower-income households. Check eligibility at gov.uk.