Adding green and buildings to existing rooftops means searching for answers to many questions. About the construction and capacity of the rooftop, suitable plant species and the business case of a rooftop village, among others. The research through a pilot village, by Stichting Dakdorpen, has been underway now for one and a half years. A permit application has been filed towards the first realisation of a rooftop village on De Kroon, a building in the west of Rotterdam.