This week Sara is joined by Sarah and Michael Lewis. Both are involved in the built environment – Sarah is the Director of Policy and Research at the Passivhaus Trust and Michael is a Teaching Fellow in architectural design at Edinburgh College of Art. They shared a really detailed history of the retrofit of their home, and we focused a lot on important things such as indoor air quality, the state of the grant led measures available, and the need for attention to detail in understanding both the buildings we retrofit but the way we go about retrofitting them. A really rich listen – enjoy!