Sustainable Products, Projects and Green Design Yallingup House by Stuart Threadgold An energy efficient eco house for young family on 120 acre Yallingup property that embodied their ideals to live sustainably and off-grid.The residence is elevated for views, cooling breezes and large northern glazing for radiant heat gain with harvested rainwater storage of 550,000 Litres. The residence boasts a 5.5 kilowatt photovoltaic system behind anthra zinc parapet.It is power and water self-sufficient,incorporating passive solar design principles and is surrounded by citrus,nut and pomme fruit orchards which are sited to permaculture principles as part of the design brief.