This time, we dive into the circular world. The circular economy is all over the place in the Brussels policy scene since the European Commission presented the Circular Economy Package in early 2018. But what do we actually mean with the term ‘circular economy’? What is the potential of the housing sector in delivering an eco-friendy future for our cities? We address these key questions with 2 excellent guests. TU Delft Assistant Professor of Housing Management, Gerard Van Bortel helps us understand better the challenges that circular building adaptation brings for public, cooperative and social housing providers but also the multiple benefits linked with it. Theresa Heitzlhofer, communications manager Alchemia Nova in Vienna offers us insights from one of the demonstration cases of the Horizon 2020 'Houseful' project. We end our journey in Denmark where Lejerbo, a member of our Danish member organisation BL, is building the World's first social housing unit after circular principles.