This study aims to clarify spatial structures in contemporary Thai houses based on passive design strategies. The functional arrangement according to heat avoidance techniques for thermal conditions was focused. Firstly, Thailand geographical conditions and traditional house’s spatial structure were outlined. Then, the spatial structure of the contemporary house was investigated on functional occupancy on perimeter and sectional level area with their shapes. The characteristics of contemporary and traditional houses are especially analyzed throughout patterns. The result suggests an inherit from tradition in the spatial structure even though it is not the dominant character in the contemporary houses.