House in Ashiya by Kazunori Fujimoto

Sculptural geometric form goes beyond the function

Project Specs


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Appreciation towards Kazunori Fujimoto for providing the following description:


The site is located at the foot of Mt. Rokko, near former Yamamura House (by F.L.Wright in 1924), blessed with the green scenery of the mountain. The traffic on the frontal road, which is also a sightseeing route, is a little heavy, and the next house blocks the view.

▼住宅鸟瞰图,bird-eye’s view of the house


▼空间轴测图,住宅空间由两个角部相交的正方形体量构成,axon, two squares make a constriction in a one-room space

The house would be better where each person can have a sense of distance and relationship with each other. Also, it would be better the relationship between the inside-outside space is the same as the relationship between the family. This house strongly expresses the geometrical composition. Two squares make a constriction in a one-room space. On the second floor, a cross-wall divides the square. On the first floor, it is divided to make recesses of the house. A spiral staircase is placed at the waist to connect the three spaces.

▼住宅外观,具有极强的几何构图,清水混凝土的方盒子体量上嵌入大面积的方形玻璃,exterior view of the house that strongly expresses the geometrical composition, inserting large glass window on the concrete facade


Maintaining the spatial purity, we carefully considered the layout and dimensions of each architectural element to lead the ambiguous relationship between inside and outside spaces, and also between the families. In the living room, the wall was set in a windmill style. The opening was set at a height to block the view from the neighbors. Through the windows, it is possible to see the green directly or through the room. Moreover, the set of windows contribute to keeping spatial continuities to the whole periphery of the site. The wall surroundings safe living areas while windows make it open at the same time.

▼双层通高的起居室,the double-height living room

▼起居室空间,在起居室的墙体上设置大面积的高窗,确保了私密性和景观视野,the living room, setting opening at a height on the walls to block the view from the neighbors and provide a good view

▼起居室局部,梯子可以通向二层的小平台,partial view of the living room, the ladder can lead up to the small terrace


The unique spiral staircase (the center of the stair is a straight line) is useful to make minimal area for the stairs and corridor. Its size is the smallest in the plan. By the reason the thickness of the slab is minimum, the space under the stairs can use as a corridor.

▼通向二层的螺旋楼梯,the spiral staircase leading up to the second floor

▼站在螺旋楼梯上看一层起居室,viewing the living room on the first floor from the spiral staircase


This spiral staircase serves as a partition between the entrance and the bedroom. On the 2nd floor, an opening was set in the center of the outer wall so that the two areas share one window. The width between this window and the cross wall was reduced to 550 mm to create spaces that provide comfort distance between children.

▼住宅二层空间,与首层具有良好的视线联系,second floor of the house with a good visual connection with the first floor

▼住宅二层的卧室空间,设置大窗,the bedroom on the second floor with a large window

▼住宅二层的卧室空间,十字隔墙与窗户之间留有缝隙,创造出一种既分离又联系的氛围,the bedrooms on the second floor, the gaps between the cross-wall and windows create a comfort distance between children


The curved surface of this concrete spiral staircase gives softness to rigid space. This sculptural geometric form goes beyond the function and becomes the Yorishiro (object in which a spirit draw), which symbolizes the unity of the family in this house.

▼通向二层的螺旋楼梯,其下方的空间可作走廊使用(左),室内走廊(右),the spiral staircase leading up to the second floor, the space under it can use as a corridor (left), the interior corridor (right)

▼雕塑般的螺旋楼梯,the sculptural spiral staircase

▼住宅平面图,floor plans


Architects: Kazunori Fujimoto Architect & Associates (Kazunori Fujimoto, Andrea Ferri)
Location: Ashiya, Hyogo, Japan
Project Planning: 2016-2018
Construction term: 2018-2019
Site area: 219.28mq
Building area: 57.78mq
Total floor area: 88.45mq
Structural engineer: Eiken Structural Consultants (Eiichi Tsumura)
Construction Team: Yamamoto Koumuten
Photography: Kazunori Fujimoto

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