Broken Pitched Roof House

JA+U : Broken Pitched Roof House by NKS architects © Shinkenchiku-sha

Located on a generous site in Nakatsu, Oita Prefecture, this single-story house is separated from the street by a wooden slatted screen. It’s reminiscent of fortified towns from Edo period.

JA+U : Broken Pitched Roof House by NKS architects © NKS architects

Plan courtesy of architect

JA+U : Broken Pitched Roof House by NKS architects © Shinkenchiku-sha

JA+U : Broken Pitched Roof House by NKS architects © NKS architects

Section courtesy of architect

The concrete roof of the 211.3 m2 (2,274 ft2) home is swept upward on four rectangular boxes. They contain the entrance, kitchen, bathroom, and storage. The house is naturally lit by daylight entering through a skylight in the top of the roof.

JA+U : Broken Pitched Roof House by NKS architects © Shinkenchiku-sha

The highest point of the ceiling is 5 meters-high (16.4 feet), but the roof curves down to 1.8 meters (5.9 feet) at the edge of the house.

JA+U : Broken Pitched Roof House by NKS architects © Shinkenchiku-sha

The interior is loosely divided by the four concrete cores. The concrete roof provides thermal mass, and the openings in the cores admit natural light and air into the room. The curved ceiling brings views down to the patios and garden protected by the outer wooden fence.