Where Wings Become Walls

MIDW architectural office opens the walls of a Tokyo house diagonally outward like spread wings — resolving urban privacy, light, and spatial flexibility through structural invention rather than convention.

Every densely populated residential area in Tokyo produces the same effect: rooflines aligned to the same diagonal regulations, windows positioned to manage the same privacy anxieties, facades that reveal, if you look carefully, exactly which room lies behind each opening. Daisuke and Saori Hattori of Kyoto-based MIDW found this homogeneity worth questioning — and in a residential area in Ookayama, on a site beside the residents' parents' home, they built a house that refuses the standard answers while meeting every legal requirement with a kind of structural wit.

The building takes a three-storey mixed structure — reinforced concrete basement, wood and steel above — and opens its north, east, and west walls diagonally outward, like wings spreading from a central volume. The south face drops vertically and is covered by a membrane roof that functions as the building's curtain: it blocks external sightlines while admitting soft, diffused natural light into the interior. At the four corners where the opened walls create gaps, frosted glass catches and distributes light so that, as Hattori describes it, the outside appears to jump into the interior rather than the interior opening outward. From the street, it is impossible to determine which room occupies which position — a quiet but decisive inversion of the conventional window logic that typically exposes domestic functions to the neighbourhood while claiming to protect them.

"When the light shines through the corner, it feels like 'the outside jumps inside' rather than 'opens from the inside to the outside.'"

The spatial sequence follows the residents' stated priorities with equal precision. The basement holds a large cloakroom and storage — designed around the desire to keep living spaces clear of accumulated objects. The first floor contains the LDK, expanded in area by the diagonal wall openings. The second floor holds two flexible bedrooms across a simple corridor. Seams introduced across the mortar floors and white plaster walls create what Hattori calls a rhythmic space calibrated to human scale. Exposed steel junctions where the wing walls connect to the timber structure are left visible throughout — the architect's argument that understanding a building's construction logic deepens rather than complicates the experience of living in it.

The floor plan is deliberately open, with minimal fixed partitions: an acknowledgement, Hattori says, that a house designed for the next fifty or a hundred years should not make too many decisions in advance.

Key takeaways

• MIDW architectural office resolved the contradictions of urban Tokyo housing — privacy, light, floor area, and legal diagonal restrictions — not through conventional windows but by opening the north, east, and west walls diagonally outward like wings, with frosted corner glass that makes light appear to jump inward rather than revealing the interior to the street.
• The spatial organisation follows the residents' priorities with precise hierarchy: a basement dedicated entirely to storage and cloakroom keeping the living floors clear, a maximally generous first-floor LDK expanded by the diagonal wall openings, and deliberately simple second-floor bedrooms designed to remain flexible as life changes over decades.
• Exposed steel junctions, visible structural material transitions, and deliberately induced seams in mortar floors and plaster walls are design decisions rooted in Hattori's conviction that showing how a building is made — its origins, its structure, its logic — contributes positively to the experience of living in it over the long term.