Chumon-zukuri is a specific housing formats of the area with heavy snowfall in Tohoku region. Okugawa valley in the west of Fukushima prefecture is one of the distributional areas of Chumon-zukuri. However, the accurate residual status has not been clarified. The purpose of this study is to disclose its distributed condition by the field survey, and to propose the guidelines for prevention of fire damage of roofs, exterior walls and so on, based on quantitative analysis of the fire prevention efficiency.