The Tomomi Kito Architect & Associates renovated an interior existing two-story timber structure house in Tokyo which was built approximately 40 years ago.

House for Four Generation by Tomomi Kito Architect

Architect: Tomomi Kito Architect & Associates
Location: Tokyo, Japan
Completion: April 2017
Area: 140sqm
Structural designer: Building Structure Institute
Technical advisor: Yutaka Misawa
Lighting advisor: Kanae Hagiwara
Photo credits: Satoshi Shigeta

House for Four Generation by Tomomi Kito Architect

From the architects: The clients, a young couple and the wife’s parents, were already living here before the renovation. Soon after, the wife’s grandmother, who lived alone in the countryside far from Tokyo, also decided to move in. As such, the clients requested to renovate the house and to make it suitable for accommodating 4 generations—the grandmother (1st generation), the parents (2nd generation), the clients (3rd generation), the clients’ son (4th generation).

House for Four Generation by Tomomi Kito Architect

As the age as well as daily living rhythm of each family member are different, creating a space to promote a comfortable connection among them was one of the major challenges of the project.

House for Four Generation by Tomomi Kito Architect

Another focus was the provision of a comfortable living environment. The existing conditions of daylight and ventilation were not preferable since the existing rooms were split into smaller functions and as such they were not open to the exterior environment nor to each other, which led to poor daylight and natural ventilation.

House for Four Generation by Tomomi Kito Architect

Firstly, the architects carefully studied the arrangement of rooms to take full advantage of existing windows thus maximizing natural daylight and ventilation.

House for Four Generation by Tomomi Kito Architect

Furthermore, common spaces adjacent to private rooms were secured in each floor. They act as communication hubs to seamlessly connect different generations. The private rooms are also exchangeable among the members so as to enhance communication between generations; similar to a share-house lifestyle.

House for Four Generation by Tomomi Kito Architect

However, since private rooms were prioritized in planning, securing enough natural daylight in the common space on the 1st floor became another challenge; particularly as it faces north. Consequently, a catenary ceiling was designed on the 2nd floor to better reflect daylight into the 1st floor; this became a distinguishing feature of the house.

House for Four Generation by Tomomi Kito Architect

At the same time, the existing structure was renewed. Although the columns were densely arranged in accordance with the existing partitions, the architects found that the existing house was structurally unbalanced and lacked the necessary structural resistance. As such, they decided to add reinforcements through supporting beams and structural plywood whilst optimizing the use of its existing structural components. As a result, some columns were deemed redundant and thus removable (in total 20 columns were removed), providing an opportunity to create open spaces.

House for Four Generation by Tomomi Kito Architect

The catenary-shaped ceiling now gently envelopes all 4 generations of the family who ultimately enjoy living in a space abundant of natural daylight and ventilation.

House for Four Generation by Tomomi Kito Architect

House for Four Generation by Tomomi Kito Architect

House for Four Generation by Tomomi Kito Architect

House for Four Generation by Tomomi Kito Architect

House for Four Generation by Tomomi Kito Architect

House for Four Generation by Tomomi Kito Architect

House for Four Generation by Tomomi Kito Architect

House for Four Generation by Tomomi Kito Architect

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House for Four Generation by Tomomi Kito Architect

The Tomomi Kito Architect & Associates renovated an interior existing two-story timber structure house in Tokyo which was built approximately 40 years ago

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