About Tachikawa ANNEX House
Tachikawa ANNEX House is an additional structure to the original corporate headquarters of a clothing maker and the owner’s house, which we designed around ten years ago. The site consists of multiple zones with different regulations, resulting in varied structures and heights. While the main house is a five-story reinforced concrete building that stands upright, we decided to create a light wooden building in the expanded area at the rear of the site, specifically in the low-rise residential zone.
© Koji Fujii / TOREAL

The timber frame structure consists of a lower structure with two-story posts and a roof structure with 90 by 90 mm timber struts. The timber struts support the purlins and shift in angles to form HP surfaces. The lower and roof structures, along with the floor frame in between, create a spacious single space on each level. © Koji Fujii / TOREAL

The first floor serves as both a warehouse and a photo studio, while the second floor is the owner’s second residence. The ground level of Tachikawa ANNEX House is designed to minimize the amount of light entering the space, whereas the upper level has large openings in the roofs to maximize natural light for residential use.

© Koji Fujii / TOREAL

The use of translucent polycarbonate with a thick void layer for insulation and thermal protection in an outdoor shading system. This system was implemented to address low-angle sun exposure and block views from monorail tr...