Boundary House is a minimalist house located in Tokyo, Japan, designed by Niji Architects. The floor, wall and roof consist of panels with enough strength and rigidity to allow fastening directly to the frame without the need for backing, greatly reducing cost and time of construction. The steel frame was left exposed and the details were designed to be seen. Finally an eave and a balcony were provided according to the client’s need as an option and they were fastened directly to the structure with bolts and nails. These options made the house unique and its style expresses the client’s personality and flair as a result.