The site is located in a historic, green residential area. The area was very large, about 1200 m2, and the main building, hut, and many trees still existed on the premises. In addition, there was no building on the adjacent land, and many trees still existed as on the site. When I first saw this site, which looked like it was surrounded by greenery, I felt the “potential” of developing in various directions. Build a home for a child household in the future. Build a hut as needed. You might want to build a observatory tower, a big deck, or an athletic. A small village is completed by modifying it over a long span. Such a concept came to me. I thought that we should expand the possibilities of this site and think of a house that would become a new base.
In order to open as much as possible to the site and to have a connection, it was a semi-one-story type, and the entire south side of both the first and second floors was an opening. On the 2nd floor, a cockpit-like room is set up from the 1st floor, and the 1st floor roof is covered with a grass roof. It was set up as a stage to enable approaching the building not only from the first floor but also from the second floor. For example, it may be possible to increase the approach by building a new building on the site and connecting it with a bridge or by providing an external staircase. Since there is no structural problem even if the opening on the entire south surface is removed, it is possible to build a new hut and connect it directly. With this house as the main, it was constructed so that it could be expanded by connecting sub-huts.


The possibility is continuous inside. I tried not to limit the usage of the interior space by not providing partitions as much as possible. The entrance soil and the children’s room on the second floor will be a large studio, and partitions can be provided in the future. The number of children in the future is uncertain, and it was necessary to consider the possibility of parents living together. Rather than predicting the possibility and deciding at the design stage, the uncertain part is decided while living, and the space composition is such that it can be completed. For that reason, I dared to finish it with larch plywood. By selecting materials that are easily available and inexpensive, I thought that the client, who is good at DIY, would be able to customize later.
The design is not limited to all possibilities at the initial stage, and the time of completion is not 100%. About 50% of the entire site may be the current degree of perfection. Over the years, the remaining 50% was inherited across generations, aiming to design a base that would be completed.

Completion: June 2017
Location: Tateyama City, Chiba Prefecture
Use: Private housing
Structure: Two-story wooden structure
Site area: Total site area / approx. 1200 m2, divided site area / 240.25 m2
Total floor area: 92.74㎡
Design supervision: N.A.O. Naoki Kato
Construction: Kato Construction Co., Ltd.
Photo: Shinichi Hanaoka