Koganei's Green Tunnel House: A Harmonious Blend of Nature and Architecture




This architectural endeavor by OFA (OfficeForArchitects) brings forth a unique two-story wooden dwelling nestled in a tranquil Tokyo suburb. The design pivots on a central idea: integrating a 'green tunnel' into the home's very essence. This vision guided the selection of the site, which fortuitously adjoins a verdant urban park. The result is a residence that blurs the lines between interior and exterior, inviting the lush natural scenery to become an integral part of daily life. The thoughtful placement of large apertures ensures that the surrounding greenery is not merely observed but experienced deeply within the living spaces, embodying a profound connection to nature.
The genesis of this distinctive residence stemmed from a shared aspiration between the homeowner and the architectural firm to weave nature directly into the residential fabric. Their collaborative journey began with an intensive search for a location that could genuinely support this ambitious concept. The chosen plot, bordering a vibrant urban park on Tokyo's fringes, proved ideal. The design team then meticulously planned the structure to capitalize on the park's existing flora, ensuring that the visual and sensory experience of the 'green tunnel' would be consistently present throughout the house.
The dwelling's design is characterized by its strategic use of large openings, which function as conduits for the exterior landscape. These openings are not merely windows but carefully crafted frames that capture and extend the verdant expanse of the park into the home. This architectural gesture creates an immersive environment where residents can enjoy the tranquility and beauty of nature from various vantage points within their private sanctuary. The timber construction further enhances this organic connection, lending warmth and a natural aesthetic to the interiors.
Completed in 2025, this 95-square-meter home stands as a testament to innovative residential design, demonstrating how architectural ingenuity can transform a suburban plot into a verdant oasis. The team, led by Kiichiro Usami and supported by collaborators like Mitsuhide Hashimoto for architectural design, Hirokazu Osaka for structural engineering, Atsushi Kataoka for design support, and Tadaharu Ina for construction management, successfully brought this unique vision to life. The integration of the park's greenery was a primary consideration, dictating the home's orientation and the placement of its key features, resulting in a living space that feels intrinsically linked to its natural surroundings.
The SA House in Koganei showcases an inspiring approach to suburban living, prioritizing nature's embrace. Through careful site selection and a design philosophy centered on bringing the outdoors in, the architects have created a harmonious timber house that serves as a tranquil retreat, offering its occupants a constant connection to the beauty of the adjacent urban park.