The aim of this study is to clarify the characteristics of indoor and outdoor living spaces in contemporary Japanese courtyard houses. Firstly, furnishings of courtyards, such as floor-materials, sky-coverings and fixtures, are analyzed. Secondly, spatial connections between courtyards and living rooms are analyzed by their sectional arrangements and floor areas. Finally, seven compositional types of furnishing of courtyards and connection with living rooms are suggested. Prevalent types show a tendency of characteristics of small courtyards something like attached outdoor rooms because these courtyards are mainly furnished with artificial floor-materials and connected to adjacent living rooms. Types of the combination of artificial and natural floor-materials emerged in various spatial connections. The type of courtyard furnished with only natural floor-materials is found in the case of combination with living rooms on the upper floor.%コートハウスは、建物や塀で囲まれた外部空間である中庭を有する、都市住宅の形式の一つである。日本では、京都などの町家にみられる形式としても知られているが、このような伝統的な建物に限らず、現代の建築家による様々な住宅作品においても、コートハウスの形式を用いた例は多くみられる。
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