Located on a 32’x80’ lot in Northern Liberties, Philadelphia, this project consists of 2900 SF of program on 2-1/2 stories. Simple, bright rooms are arranged around a stairwell flanked with light wells. Every interior space connects to the outdoors through carefully framed views, terraces, and open passages. Despite an extremely restrictive budget and low construction costs, sustainable practice determined much of the design, including the extensive use of recycled building materials, and sizing the engineered wood roof members to support a green roof. High efficiency mechanical systems, spray-applied polyethylene insulation, and plentiful natural daylight and ventilation help the house exceed energy design standards by over 50%.