This lake side retreat recently received LEED Platinum Certification, the highest level of certification possible, from the U.S. Green Building Council (USGBC). It incorporates energy efficient geothermal heating and cooling; super insulating spray foam insulation; 2" of continuous exterior insulation at walls and roofs; ultra high performance windows with 3 layers of low E coatings and 3 air spaces which are 3 times more efficient than typical dual glazed windows; an air to air heat exchanger to economically provide continuous healthy fresh air, and a PV solar system which is expected to generate 95% of its electricity. Beautiful highly durable long lasting practical sustainable materials such as stucco; cedar siding; metal roofing; FSC wood trim, wood flooring and wood cabinets from sustainably managed forests; local Vermont marble slab countertops; and low and non VOC paints, glues and stains were utilized throughout. The interior space was carefully designed, so the home lives much larger than a typical house of its size. This sense of expansiveness is enhanced by the high ceilings and large windows opening up to the spectacular lake views. These windows capture passive solar winter heating, while the large overhangs and covered decks provide passive summer cooling and covered outdoor living. The house, site and landscaping was designed for accessibility, low maintenance and low operating cost to allow for long term independent living.