Idaho was the last state in the Northwest to adopt a non-residential energy code. In 1996 it had no statewide energy code, though the City of Idaho Falls and Kootenai County enacted the Northwest Energy Code (NWEC) in 1989, which included by reference ASHRAE 90.1-1989. In 1999, all state buildings were required to meet ASHRAE 90.1-1989. By 2002, the 2000 IECC had been adopted for all state buildings.
Idaho approved its first statewide commercial energy code along with new residential energy standards through House Bill 586 on March 27, 2002. The legislation required local governments that issue building permits and enforce building codes to adopt the 2000 IECC by January 1, 2003.
On March 23, 2004, House Bill 756 was signed into law, updating the Idaho Building Code Act (Idaho Statutes Title 39, Chapter 41) to include the 2003 IECC. The new code became effective January 1, 2005.
On March 26, 2007, the governor signed HB 137, which made the 2006 IECC mandatory for new buildings statewide effective January 1, 2008.
One April 17, 2009, the governor signed H0220, adopting the 2006 editions of the IBC, IRC, and IEBC, as well as reaffirming the use of the 2006 IECC.
After approval by the state legislature in 2010, the Idaho Division of Building Safety’s Building Code Board has moved to adopt the 2009 IECC. On June 8, the Board met to consider proposed amendments to the 2009 IECC. Ken Baker of K Energy presented webinars on the residential and commercial differences between the 2006 and 2009 editions of the IECC. As of January 1, 2011, all Idaho jurisdictions will be required to comply with the 2009 IECC.
The Association of Idaho Cities will be holding its annual Idaho Energy and Green Building Conference on October 20-21 in Boise.