Using housing books during Pre-war, we clarified the changes in floor plan in terms of the shape and layout of staircases. When the 2nd floor use changed in the mid-Taisho period, the staircase layout in the floor plan showed an immediate response in the drawings, however a slower response in the descriptions, which were written only appeared after 1931. Many of the staircase descriptions focused on recommending turned staircases in order to correct the steep stair slope in conventional housing, which were dangerous and inconvenient, thus this delayed the formation of discourse on the staircase layout.
