Rose Seidler House, House museum in Wahroonga, Australia

Rose Seidler House is a two-storey, twelve-room modernist house on Clissold Road in Wahroonga, built 1949–50 of bush stone, reinforced concrete, timber and glass. Its upper white box sits on a pale stone base; the front facade has four orange ribbed panels in a white frame, three smaller orange windows and a blue-panelled window. A white balcony with thin metal railing projects at the right end.

The house was designed and built between 1948 and 1950 by architect Harry Seidler for his parents Rose and Max, who arrived in Australia after World War II. It became a landmark of postwar Australian architecture and influenced how residential design developed in the country.

Rose Seidler initiated the commission and made the main client decisions, so the house carries only her name, not her husband Max's. She planted the garden herself, growing frangipani, oranges, port wine magnolia and Queensland firewheel trees that could not have grown in Vienna or England. The museum has opened to the public each Sunday since 1991.

The museum is situated on Clissold Road and opens on Sundays for guided tours that take visitors through the rooms and show the original furnishings and design choices. The surrounding bushland offers walking paths around the property and makes it easy to see how the house relates to its natural setting.

The house was among the first in Australia to merge European modernism with local climate needs, using construction methods that were groundbreaking at the time. Many architects regarded it as a model for contemporary building in warm climates.