Called T Noie, which refers to the house's T-shaped structure, the 102-square-metre, two property is located in Toyota, Aichi Prefecture.
From the outside, the tall and narrow building appears to have very few windows, with an uninterrupted facade of painted wooden planks.
The only openings are clerestory windows that wrap around the top of the walls and a sliding glass door positioned on one side.
But in contrast to the dark exterior, the interior is lined with natural Falcata plywood and has a largely open-plan layout. It boasts a towering eight-metre-high ceiling that provides sight lines right from the top to the bottom of the building.
Sasaki, who leads the firm Katsutoshi Sasaki + Associates, lives in the house with four other members of his family, plus occasionally an intern working in his office.
"I designed the interior for the family, and the exterior for the neighbours and the region," Sasaki explained to Dezeen.