SEAL House is an 1,800 square-foot home built in 2011. Performance goals were inspired by the Passive House standard. The house combines a double-wall system with elements of traditional timber framing, incorporating wood milled from the site as well as salvaged and recycled materials. The double-wall system creates an aesthetic and functional benefit of wide sills on windows throughout the home. Positioned on a small footprint on an infill lot, the house is oriented for maximum passive solar gain, requiring minimal wood stove heating in winter. Hardy perennials planted in 2012 are projected to grow up onto the solar shade structure this summer.