Recently completed, this two-story addition adds apx. 1000sf of new living space to a century-old, single-story, one-bedroom Victorian house situated on a steep hillside in San Francisco’s Noe Valley neighborhood. Designed to accommodate the needs of a growing family, the rear portion of the house has been extended horizontally to provide additional living area, and vertically to provide two additional bedrooms and a small study. The basement has been expanded to provide additional storage space adjacent to the garage and garden. Old and new are stitched together by a skylit central staircase connecting all three levels. Materials were chosen that complement the existing structure while giving the new portion its own identity and a warm, contemporary feel. Window locations were carefully chosen to take advantage of the sweeping views of San Francisco and the bay beyond. Sustainable strategies are include the use of fly ash in the concrete of the new foundations, FSC-certified lumber, photovoltaic panels, solar water heater, hydronic radiant floor heating system, reclaimed wood flooring, low VOC paints and finishes, urea-formaldehyde-free materials with high recycled content, new energy efficient appliances and light fixtures.