Insulation Guide 2026

A complete 2026 guide to home insulation in the UK. Covers loft, cavity wall, solid wall, underfloor and room-in-roof insulation; the moisture and ventilation risks that poorly specified insulation creates; spray foam and its effect on mortgages and surveys; which measures actually reduce bills and by how much; available funding and its conditions; realistic 2026 costs by measure; and how to have a property assessed before committing to any insulation work.