Building America an industry-driven research programme, sponsored by the Department of Energy (DOE), designed to accelerate the development and adoption of advanced building energy technologies in new and existing homes. Building America is a public-private partnership that partners with DOE, the national labs, and industry Research Teams to conduct systems engineering research to develop technologies and strategies that achieve desired efficiency goals. Partners include leading national and regional builders who produce about 50% of all new housing, local home building associations, and individual builders. The Building America project combines the knowledge and resources of industry with the DOEs technical capabilities and builds cost-shared research homes and communities. The goal is to develop cost effective solutions that reduce the average energy use of housing by 40% to 100%. Ultimately, Building America research will lead to net zero energy homes, which produce as much energy as they use.