a double height void cuts through this house in japan

revitalizing an old vacant dwelling

hayato komatsu architects has rejuvenated an unoccupied 50-year-old house in hiroshima, japan, to accommodate a family of three. the design team sought to optimize the living environment, with a minimum of operations. therefore, a central aperture pierces the flooring, determining the spatial qualities of the project. this void was strategically placed to achieve thermal control, air circulation and allow optimum daylight to flow the interior. all images by noriyuki yano

achieving sufficient lighting and good ventilation

the design by hayato komatsu architects (see more here) is articulated in response to this central opening. along with the strong visual connection between the two levels, the full-length opening creates a thermal circulation. the position and dimensions of the opening are determined in consideration of creating a corridor, so the users can easily access the upper floor and control the windows’ condition.

the second floor is penetrated by windows in all directions, letting the lighting reach the north side of the first floor through the void. the margin created around the aperture became a passage that doubles its functionality, serving as a library stack, accommodating a second living room for the family. by doing so, it creates a vertical connection with the living room on the ground floor, encouraging the interaction between the members of the family.

the first floor includes a space that runs through the north and south zone forming a path for the wind, while in winter it receives light from the south and stores heat. as for heat insulation, all existing heat-insulating materials have been adjusted to the current standards, and an inner window has been installed at the boundary between the inside and outdoors. the structure is calculated on the premise of seismic retrofitting, and branch-like beams were added under the existing one.

connecting the two levels, all the while maintaining privacy