The article focuses on cohousing phenomenon in order to identify what are public and private spaces within communities. It aims to trace both the influences that this new model of living may have in defining private and public space and the effects on the context where the communities rise. The phenomenon is analyzed in relation to two perspectives: the first one considers the relationships between members and the internal public/private dimension; the second considers the relationships between community spaces and the outside. Cohousing spaces could be defined as "semi-private" or "semi-public" in relation to the degree of opening or closure toward outside. The English case-study, The Community Project, shows the difficulty in classifying this new form of living in specific public or private categories.
Keywords: Cohousing, Way of Living, Communities, Neighborhood, Public Space, The Community Project