Many kinds of components are used in buildings. They are progressing or turning year by year. However, ordinary components are rarely recorded. It is very important to catch the development of building components and their backgrounds, fe have been making research of them for about eleven years. In this study, we researched into development of unit bath. Unit bath was used only in hotels and condominiums for the first time. Afterward, it has been used in houses, too. Today, it is very popular. In this paper, we show the summary of development of unit bath.
