Photo credit Michael Partenio This new home takes advantage of a beautiful hilltop site. The outdoor spaces function as an extension of the house and support the family’s casual, sports-oriented lifestyle. The design, for a family of seven, provides spaces for individual privacy and family gatherings. The design challenge was to incorporate a number of sustainable features into the design. The south-facing roof is integrated with a 5-kilowatt photovoltaic system, generating electricity for the home and furnishing emergency backup power. The heating is exclusively radiant with high efficiency boilers partially burning biofuel. Measures taken to produce an efficient building envelope include a drainage plane behind the siding, spray foam insulation, and high performance, insulated window glass.