A unified green building code that could become the foundation for LEED certification was created in 2011, thanks to a partnership among ASHRAE, the International Code Council (ICC), the American Institute of Architects (AIA), the Illuminating Engineering Society (IES), and the U.S. Green Building Council (USGBC). That effort got a boost in August 2014, when ICC and ASHRAE agreed to align the technical requirements of ASHRAE’s Standard 189.1 for High Performance Green Buildings (189.1) with ICC’s International Green Construction Code (IgCC) into one single model code.








