The aim of this study is to clarify the spatial structure of contemporary Thai houses. It focuses on the arrangement of cooking and sleeping areas, which have been functional areas since the traditional time. Firstly, the characteristics of traditional houses are described. Secondly, the spatial arrangement of contemporary houses is examined. Finally, the compositional aspects between the traditional and contemporary houses are compared and refered in terms of social and environmental factors. kitchens and as connecting areas of additional functions. In addition, sleeping areas in the contemporary houses are generally designed as tightly enclosed spaces for each unit and the bed headding situated away from west which is similar with the interdiction in traditional houses.