NAHB

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15-40% above 2003 IECC or local code. First published in 2005, the NAHB Model Green Home Building Guidelines were written by a group of builders, researchers, environmental experts, and designers to provide guidance for builders engaged in or interested in green building products and practices for residential design, development, and construction. The Guidelines were also written to serve as a “baseline” so that NAHB members could easily develop local programs. Local jurisdictions and utilities promote the program and provide verification, such as in Pierce County, Washington where it is Washington State Department of Ecology, Puget Sound Energy and Tacoma Power.