The UK has the least energy efficient housing stock in Europe. It is estimated that more than 3,000 people die every year due to the cold, unable to afford warm homes. Heating our homes is also a major source of carbon emissions.

A new approach to retrofit known as Energiesprong (energy leap) could provide the transformation needed in the domestic buildings sector. It has the potential to almost eliminate the carbon emissions of 41 per cent of UK housing stock, at the same time as providing warm, comfortable homes for many more people.