The return of the housing issue, stemming from the problems of housing costs, immigration and segregation, has met with great resonance among the wider public. The how of housing has drawn attention once again. Lower middle-class housing in an enclosed residential unit, which established itself in the 1920s, dominates up until today but has been outdated for a long time. This housing concepta living room, bedroom and childrens room, as well as a kitchen, bathroom and hallwayruns counter to housing that fosters integration, participation and social cohesion. Special opportunities are opened up in this respect by projects that enable the intercultural, moderated and communal cohabitation of various social groups and persons from different geographical backgrounds: integrative housing projects. The authors of this volume have sought out some of these and examined them in case studies. This book focuses on the cohabitation of locals and the newly immigrated.