House in Koto: A Sunset House on Lake Biwa

Lake Biwa is the largest freshwater lake in Japan, and the villages along its eastern shore look west across rice paddies toward the water and the mountains beyond. The sunsets are the reason people stay. House in Koto, designed by Uno Architects, is a house built for that sunset. Everything in the plan, the section, and the material palette is arranged so that the last light of the day reaches the deepest part of the interior.

The house sits in a small village between rice paddies and traditional Japanese houses. It is single-storey with a mezzanine loft, clad in cedar and metal, with a deep overhanging roof that creates a covered terrace on the western side. The form is familiar: pitched roof, timber structure, engawa. What makes it exceptional is the precision with which the section captures light.

The Landscape: Rice, Water, Mountain

The aerial photographs are the best introduction to the project. The house is a small metal-roofed rectangle in a grid of bright green rice paddies. Lake Biwa is visible at the horizon. Mountains frame the view on three sides. The village is a cluster of traditional dark-roofed houses. The new house fits into this pattern without imitating it: the scale is right, the roof pitch matches, but the materials and openings are contemporary.

The Engawa and the Western View

The covered terrace on the western side is the room that connects inside and outside. The cedar-lined ceiling extends from the interior through the glass wall and over the concrete deck. You can sit here in rain and watch the rice paddies flood. You can sit here at dusk and watch the mountains turn purple. The engawa is the most important space in the house because it is where you stop moving and start looking.

The deep overhang shades the interior from the high summer sun but lets in the low winter sun. This is a section calibrated to the latitude. In summer, the terrace is shaded. In winter, sunlight reaches the back wall. The house changes with the season.

Cedar Interior: Kitchen, Living, Tatami

Inside, the ceiling is entirely cedar: warm, golden, and continuous from wall to wall. The plan is open: kitchen island, dining table, living area, and a tatami room separated by blue-green sliding doors. The colour of those doors is the single chromatic accent in the house. Everything else is cedar, white, and grey.

The mezzanine loft overlooks the living room through a cedar railing. The ridge of the roof is exposed, giving the room a height that the footprint does not suggest. From the loft, looking down through the columns and out through the glass, the landscape is framed twice: once by the window, once by the structure.

Dusk: The House as Instrument

The best photographs are taken at dusk. The cedar ceiling catches the last orange light from the west. The pendant lamp over the dining table glows against the deepening blue outside. The mountains are silhouetted. The rice paddies are dark. The house becomes a warm box in a cool landscape.

This is what the client asked for, and what the architects delivered. A house that performs best at the moment most houses close their curtains. The section, the orientation, the material, and the glass are all tuned to this twenty-minute window. Architecture as a sunset instrument.

Village Context

From the village, the house reads as a good neighbour. The metal roof and cedar cladding are local materials used at a local scale. The pitch matches the surrounding roofs. The footprint does not dominate its lot. The garden is lawn, not hardscape. A stream runs past. This is not a house that announces itself. It is a house that belongs.

Drawings

The site plan shows the house between rice paddies and village, with Lake Biwa to the west and a shrine to the south. The floor plans show the ground-floor layout with engawa, living, kitchen, tatami, and bedrooms, plus the upper loft. The three sections reveal the pitched roof structure, the mezzanine relationship to the living room, and how the engawa connects interior and landscape.

Why This Project Matters

Japanese residential architecture has a long tradition of designing for a specific view, a specific light, and a specific season. House in Koto belongs to that tradition. It is not experimental. It is not radical. It is a house that does one thing extremely well: it catches the sunset over Lake Biwa and holds it inside a cedar room.

If you are designing a house in a rural landscape, near water, or in any setting where the view changes through the day, this project is worth studying for how section, material, and orientation work together to capture a single atmospheric condition.

About the Studio

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Project credits: House in Koto by Uno Architects. Lake Biwa, Shiga Prefecture, Japan.