The thesis focuses on rooftop farms as innovative tools to create social impact and sustainability in urban areas and describes results form a qualitative investigation of 3 case studies in Europe that answer two main research questions: 1. Which are the local practices and policies developed by these 3 municipalities for the implementation of rooftop gardens and how has actually been the process of realization of these projects? 2. Who are the stakeholders and groups of interest around these topics, which is their perception about the sustainability of rooftop farming and what impact have actually had rooftop community gardens in their social lives? As the results reveal, the situation in these 3 cities in Europe is very different, as OrtiAlti is the first project of its kind in Turin, realized recently, in May 2016, and faced difficulties in front of the absent strategies and policies of the city, whereas Paris is in a midway situation, having a considered number of rooftop farms and recent policies and strategies to increase their number; and Dakakker is a consolidated project with an established community and supported from the beginning by the local government, through an innovative process of multi stakeholder participation..