Based on a previous research made in Politecnico di Milano at the department of architecture and urban practices, my master thesis want to explore the topic of co-living. The economical crisis of today, the instable work situation and the socio-demographical changes of our decades bring important modification in the housing request. The research of affordable, rentable and flexible apartments, bring always more un-related people living together, a choice that does not regard only the youngers but the people from all ages in the entire world. Starting from a wide research including sociological and economical analysis, architectural practices and case studies, it was possible to develop the design strategies for a co-living project and apply them on a real case study.