The purpose of this study is to investigate actual situations and functions of Senzai and Tubo-niwa in Kyoto townhouse by questionnaire survey. The outcome of this study established that: 1) Both Senzai and Tubo-niwa provide daylight more satisfactorily than they provide ventilation. 2) Senzai provides both daylight and ventilation more satisfactorily than Tubo-niwa. 3) The function of providing daylight and ventilation has been adversely affected by recent changes in the surrounding environment. 4) The need for air conditioning in summer is decreased for many residents with Senzai and Tubo-niwa because of the ventilating function. 5) Senzai and Tubo-niwa bring comfort to over 80 percent of residents surveyed, and in addition, the space has an aesthetic function and serves a role in entertaining guests. 6) Most residents with to keep Senzai and Tubo-niwa in the future.
