�The purpose of this research is to validate the adaptability to 1DK by revealing what changes have taken place in the life-style of aged couple households after their dwellings were renovated from 2K to 1DK. The changes indicate that 50% of the dwellers chose to have their meals in the DK room and sleep in the traditional Japanese-style 6 mat tatami room. However, the half of these couples use Japanese low tables in the DK in their daily lives because preferences developed over a long life-time. On the other hand, half of households cannot adjust to 1DK.