This Hunters Hill mansion is a marriage of heritage architecture and modern design. The Alterations and Additions to the 19th Century stone house, have produced a home that is not only comfortable but also energy efficient and environmentally sustainable.A sophisticated 3-point water management system has been installed to capture rainwater into a 20,000 litre tank for landscape irrigation, grey-water for re-use in toilets and provision for future black-water treatment and recycling.  The home actively generates clean energy through 40 m2 of roof top photovoltaic cells whilst consciously minimising energy consumption via high efficiency T5 fluorescent lights, dimmable and LED lighting. There is a reliance on natural gas to power the home’s hydronic floor heating, pool heater, water heaters and cooking appliances. Passive design elements such as north facing orientation for living and bed rooms, generous eaves for summer shading, cross ventilation, polished concrete flooring in the main living for thermal mass, as well as wall, floor, ceiling and roof insulation contribute to this home’s commitment to environmental sustainability.