This paper deals with Adolf Loos's alterations to Duschnitz house and Mandl house, which have been positioned in a germinal stage of the Raumplan. The purpose of this paper is to clarify developments of house-alteration by Loos on the basis of analyzing these works and show it as a process of forming the Raumplan. Therefore having an eye to fragmentization in both works, this paper makes clear various phases of fragmentization. In a word, fragmentization gradually spreads to various phases of the interior and exterior of a house and intensifies to the extent of arising conflicts between fragmentary parts.
