The quality of housing stock is changing in modern urban centers of the contemporary world. It is this change that this study focuses on. In particular, the impact of socio-cultural factors on both (1) concepts of privacy, territoriality and crowding and (2) the spatial formations in homes are researched. Among the parameters which mark this change, demographic factors, family compositions and use of leisure time are selected for close examination. In parallel to those, approach of the environmental designers to the contemporary urban life-style has also changed. As another parameter, it is of critical importance to the architects and therefore will be an integral part of the paper.