White U / Toyo Ito & Associates, Architects | Classics On Architecture Lab

Architects: Toyo Ito & Associates, Architects
Area: 150.97 m² (1,625 ft²)
Year: 1976
Photography: Toyo Ito & Associates, Architects, Koji Taki, Tomio Ohashi, WikiArquitectura
Client: Toyo Ito’s older sister and her two daughters
Status: Demolished in 1997
City: Tokyo
Country: Japan

White U, a single-family residence designed by Toyo Ito & Associates, Architects in Nakano, Tokyo, Japan, created an inward-looking domestic environment for Ito’s older sister and her two daughters and was completed in 1976. The 150.97 m² (1,625 ft²) reinforced-concrete house developed after the death of Ito’s brother-in-law, when the family sought a home with closer contact to the ground and landscape after living in a high-rise apartment. An initial L-shaped proposal intended to maintain visual connections between family members gradually evolved into a U-shaped plan focused less on conventional functional organization and more on the symbolic role of the house during a period of mourning. White U arranged bedrooms at the ends of a long curved sequence, with the mother’s room on one side and the daughters’ rooms on the other. A brighter common space near the center of the bend acted as the point where the family converged, while darker corridors extended toward the private rooms. White interior surfaces, limited openings, narrow roof slots, and carefully controlled daylight created a reduced spatial environment in which shadows, movement, and changes in light became primary architectural elements. The central courtyard established the house’s relationship to nature while reinforcing its separation from the surrounding city. White U combined domestic life, circulation, enclosure, and light within a continuous spatial system rather than a conventional arrangement of separate rooms. The house was demolished in 1997 after the family had moved away, closing a 21-year period in which the architecture had remained closely tied to the circumstances for which it was created.

White u / toyo ito & associates, architects | classics on architecture lab

White U originated when Toyo Ito’s older sister asked him to design a house for herself and her two young daughters following the death of her husband. The family had previously lived in a high-rise apartment and wanted greater contact with soil, plants, and outdoor space. A site next to Ito’s own house in Nakano became available, allowing the project to develop within a familiar residential setting.

The first proposal took the form of an L-shaped house, reflecting Ito’s sister’s wish for visual contact between different parts of the residence. As the design conversations progressed, conventional programmatic concerns became less dominant, and the emotional condition of the family began to shape the architecture more directly. The scheme then evolved into a U-shaped plan that created a more inward-looking environment around a central courtyard, reduced the house’s relationship with the surrounding neighborhood, and established a protected domestic domain. The geometry connected the rooms through a continuous bent sequence rather than through a collection of isolated spaces.

The two ends of the U contain the principal bedrooms. The daughters’ rooms occupy one end, while the mother’s bedroom lies at the other beyond the kitchen and bathroom. Darker passages lead toward these private spaces, while the common area near the bend receives more concentrated daylight.

The shared space accommodated play, dining, and contemplation without relying on conventional partitions to separate each activity. The geometry of the house itself established different zones within the continuous interior. White walls, ceilings, floors, and carpeting reinforced the visual continuity between these spaces.

Daylight became one of the main architectural materials of White U. Limited openings and narrow roof slots directed light into the interior rather than opening the house broadly toward the exterior, while diagonal bands of illumination moved across the white surfaces throughout the day. The controlled light made shadows, movement, and the presence of the occupants more visible, giving the house an abstract character in which the interior operated as a continuous background for daily life.

The central courtyard provided the principal relationship between the house and nature. The U-shaped plan enclosed this outdoor area while allowing it to remain visually connected to the interior sequence. The courtyard supplied light and open space without dissolving the separation between the family and the surrounding city.

White U was constructed in reinforced concrete and remained one story high. The structural material supported the continuous curved form and strengthened the distinction between the enclosed exterior shell and the lighter internal surfaces. The house occupied 150.97 m² (1,625 ft²) of a 367.61 m² (3,957 ft²) site, with a total floor area of 148.25 m² (1,596 ft²).

The project differs from the technologically expressive architecture for which Toyo Ito later became widely known. White U instead concentrates on enclosure, light, movement, family relationships, and the symbolic role of domestic space. Its architecture developed through the specific circumstances of its occupants rather than through a generalized residential model.

Ito later described the house as responding almost entirely to the deeper emotional demands of domestic life rather than balancing those demands with ordinary social routines. The architecture therefore remained closely associated with the period of mourning that had initiated the commission.

The family’s relationship with the house changed over time. The older daughter moved away first, followed by the mother, while the younger daughter remained longer. Accounts of their experiences indicate that the architecture left a strong impression on each resident, particularly through its enclosed atmosphere, acoustic qualities, and concentration on visual perception.

White U was demolished in 1997, twenty-one years after its completion. By that point, all three residents had left the house and re-established their lives beyond the protected environment Ito had created. The demolition marked the end of a residence whose spatial organization had been shaped around a specific family condition and a particular period in their lives.