Master of Architecture / Department of Architecture / Gary J. Coates / Buildings account for a large part of total U.S. energy consumption and generate far more greenhouse gas emissions than any other sector of the economy. The purpose of this thesis is to demonstrate how buildings can be designed in a way that helps to mitigate global environmental problems, while resolving local urban design, architecture and social issues. This purpose was achieved by designing a zero-energy garage apartment for a site located along an alley in Manhattan, Kansas. The methodology for the design was to: identify a client; define project goals and design criteria; determine solar and geothermal renewable energy system requirements; design the garage apartment by employing energy efficient strategies relating to bioregional design and passive solar design; identify eco-friendly materials obtainable within a 500-mile radius of the site; and identify energy-efficient construction methods. The energy performance of the garage apartment was constantly monitored using eQUEST and Energy-10 simulation softwares. Operational definitions: Garage apartment- a building behind the main building[superscript]1, which is part of the same plot as the main building. It is also called a 'backhouse', 'granny flat' or a 'rear house'. Zero-energy house- for this thesis, a grid connected self-standing zero-energy house, which results in zero utility bills throughout the year.