Despite being surrounded by electricity pylons, this hillside cabin in Japan by San Francisco firm Anderson Anderson Architecture generates all its own energy and heating using photovoltaic panels and a ground-sourced heat pump (+ slideshow).
Named B-House, the single-storey building is positioned on a slope overlooking Kumamoto, soÂ Anderson AndersonÂ added a wall of glazing to the rear facade that gives residents a view out across the city from the living room, study and bedroom.
The house was built on a tight budget and sustainability was key to the design. "The extremely modest budget required a close collaboration of the architects and builder to achieve a high quality, off-site fabricated timber frame construction meeting high sustainability standards," explain the architects.
The edge of the roof is tilted southwards to maximise sunlight to the photovoltaic panels, while integratedÂ channels collect rainwater so that it can be reused.
There is no air conditioning, so when the temperature increases residents can slide open theÂ glazed north-facing walls.
There are only clerestory windows on the southern facade, which allow hot air to escape and prevent the unnecessaryÂ heat gain that would occur with larger windows.
TheÂ wholeÂ house sits on a thick concrete base, while the walls and roof were constructed using locally sourced timber.
The house wasÂ completedÂ in 2009, but hasnâ€™t been widely published.
Other sustainable houses we've featured include a pavilion-like house in Germany that generates all its own power, as well as a concept for a house that is entirely self-sufficient.
Photography is by Chris Bush.
Above: floor plan - click to see larger image
Above: section - click to see larger image
Above: south elevation - click to see larger image
Above: west and east elevations - click to see larger image
Above: north elevation - click to see larger image