The Great British Insulation Scheme (GBIS) is a UK government initiative aimed at improving energy efficiency in homes to reduce energy bills and carbon emissions. Running from July 2023 to March 2026, it targets homes with Energy Performance Certificate ratings of D or below, within certain council tax bands in England, Scotland, and Wales. The scheme offers insulation measures, primarily cavity wall and loft insulation, with eligibility divided into general and low-income groups24. It is expected to benefit around 300,000 households, with potential savings of £300-£400 per year on energy bills