Kasa House by Katsutoshi Sasaki + Associates

Reinterpreting the relationship between the interior and the eaves.

Project Specs


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Appreciations towards Katsutoshi Sasaki + Associates for providing the following description:


To what extent can a house incorporate the surrounding environment? Although the area is dotted with farmland, the houses around the site are separated by walls and fences, just like in urban areas. In this project, I used a large roof to create a gentle connection between the surrounding environment and the interior spaces and activities of daily life.

▼住宅位于农田之中,the house is located in the farmland © Katsutoshi Sasaki + Associates



The floor plan is based on the dimensions derived from the verification of daily life activities, and consists of 2.3m wide rooms in a cross shape. Around the rooms, four eaves are arranged as a garden. A dining room and a sofa space intervene in a part of the garden. Each room receives light and wind from the two adjacent gardens.

The generous space under the eaves opens up the family’s activities from rain and sunshine. Each garden has a different purpose, such as outdoor living, entrance approach, vegetable garden, and laundry drying.

▼项目外观,external view of the project © Katsutoshi Sasaki + Associates

▼屋檐下的宽敞庭院,generous gardens under the eaves © Katsutoshi Sasaki + Associates

▼4号庭院,用作室外活动区 © Katsutoshi Sasaki + Associates
garden 4 for outdoor living space

▼2号庭院,用作入口通道 © Katsutoshi Sasaki + Associates
garden 2 for entrance approach


The eaves of a Japanese house are usually placed at the edge of the building by about one meter, but in this project, the eaves are reversed and placed under the roof with a narrow interior space and depth. By reinterpreting the relationship between the interior and the eaves, the living space is intended to extend to the outside and to the surrounding environment, including the farmland. It is a house that shades the farmland and connects the environment and lifestyle.

▼从入口望向室内,view from entrance to interior © Katsutoshi Sasaki + Associates

▼餐厅(左),厨房(右),dining room (left), kitchen (right) © Katsutoshi Sasaki + Associates

▼厨房,kitchen © Katsutoshi Sasaki + Associates

▼从厨房望向学习空间 © Katsutoshi Sasaki + Associates
view from kitchen to study space

▼学习空间,study space © Katsutoshi Sasaki + Associates

▼爬梯通向夹层空间 © Katsutoshi Sasaki + Associates
the ladder leads to the mezzanine

▼儿童房,kid’s room © Katsutoshi Sasaki + Associates

▼从主卧望向儿童房,view from master bedroom to kid’s room © Katsutoshi Sasaki + Associates

▼屋顶细部,detail of the roof © Katsutoshi Sasaki + Associates

▼一层平面,ground floor plan © Katsutoshi Sasaki + Associates

▼二层平面,first floor plan © Katsutoshi Sasaki + Associates

▼剖面细部,sectional details © Katsutoshi Sasaki + Associates

Project name: Kasa House
Location: Kariya Aichi Japan
Site Area: 446.60m2
Built Area: 145.88m2
Total Floor Area: 82.67m2, 61.76㎡(1F)20.91㎡(2F)
Type of Construction: Wooden
Exterior Materials: galvalume steel plate0.4t
Interior Materials: Falcata plywood t=5.5mm
Design time: May, 2016 – Dec, 2019
Year of completion: July, 2020
Design team: Katsutoshi Sasaki + Associates
Structure company: Tatsumi Terado Structural Studio
Construction company: Toyonaka construction Co.,Ltd.
Photo: Katsutoshi Sasaki + Associates

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