Renovation of one room in a 50-year-old wall-type RC apartment. The existing plan was 2K with two Japanese-style rooms and a kitchen, and the area was about 30 square meters. On the other hand, the ceiling height was high at 2.9m, and it had an open view with sunlight on three sides. In order to make the most of the space created by the structure, instead of using a “floor plan” that divides functions with partitions, the functions that make up a house, such as the toilet, bath, kitchen, storage, and entrance, are minimized and subdivided into furniture-like boxes. I put them in and distributed them. This “box containing functions” is lifted off the floor by supporting it with legs or setting it on a stand. A part of this gap has a minimal rise for equipment piping, and the space that would normally be under the floor is used as a living space. Additionally, the gap between the box and the ceiling can be used for storage. There is a blank space between the boxes that can be changed depending on the situation. By treating the functions of the house like furniture, this plan aims to maximize the use of small spaces and transform them into spatial richness.