The Sunlighouse is the first CO2-neutral family house in Austria, receiving an above average proportion of daylight. The three-store house is situated on a north-east sloping hillside, with a view to the Wienerwald Lake. A three-sided, enclosed atrium is cut into the main building on the west side. Because of its shape and orientation, the building receives the maximum amount of afternoon sun deep into the house and provides, protected outdoor area with access to garden. Exclusively environmental and partially recycled materials were used in construction and the design focused on maximizing the sustainable value. The pin wood paneling of the interior is oiled white, allowing daylight to be reflected deep inside the rooms.