A young couple hired mA-style architects to design an addition to their one-story Japanese style house located in rural Yaizu, Shizuoka Prefecture, Japan. KOYA no SUMIKA was built as a casual and relaxing place for quiet times, while the main house consists of mostly large spaces for gathering.

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The two structures are connected via a hallway on the west side of the main house allowing for the residents to switch gears before entering the new space. The garden in between helps define the distance.

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The main house features the large kitchen, bathroom, and future children’s room, therefore, keeping the new space for only a few functions under a simple continuous structure.

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A V-beam roof truss adds height to the volume while U-shaped bearing walls create definition of different spaces on the interior.

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A variety of finishes are used with the warm wood of the trusses kept natural and the walls painted a stark white. The floors are partially covered in a lighter wood color that reappears throughout, like in the ladder and shelves.

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Pockets of space are created with the use of the bearing walls helping to define various functions in the open space. At one of the ends, a loft space can be reached via a floating staircase attached to the wall.

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Continuing with the simplicity of the space, single bulbs are hung from white cords to light the extension.

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Photos by Kai Nakamura.