The thesis examines how changing customs and Western influence should shape the design of Japanese homes, weighing traditional practices such as sitting on tatami and sleeping on futon against chair-based Western modes and noting sanitary and physiological consequences. It argues that designers must balance scientific, economic, and artistic requirements—particularly stability, sanitation, convenience, economy, comfort, and beauty—and advocates flexibility in aesthetic choice between Japanese and European appearances. Practical guidance urges informed clients and architects to make functional compromises that respond to social habits, health, and the needs of modern living.