Poorly constructed housing can seriously affect people’s health and wellbeing. And with the UK having some of the oldest buildings in Europe, that’s a lot of housing not fit for purpose. Almost 2.5 million families in the UK live in poor housing conditions and suffer from fuel poverty. This means they are unable to maintain a reasonable temperature in their homes due to low income. Most of the housing in the UK dates back to before the 1990s when energy efficiency design was not regulated. This not only has a huge impact on people’s health – the NHS spends £1.4 billion each year treating people affected by poor housing – but it also affects our natural environment and biodiversity.