To reach the UK's goal of net zero carbon emissions by 2050, we must ‘retrofit' around 29 million homes .That means making structural and technological adaptations to people's homes, improving their energy efficiency and reducing carbon emissions.

It is a huge task. But as our domestic residences are currently responsible for 20% of national emissions, and 32% in London alone, reducing their reliance on fossil fuels such as coal and gas is critical.