Utah

A Utah Uniform Building Standards Act was passed in 1953. In January 1976 a bill was passed that provided for the adoption of an energy conservation code for state buildings, suggested voluntary compliance by the state's political subdivisions, and recommended voluntary compliance by the state's building industry. In March 1977 legislation was passed requiring the Building Board to promulgate an energy conservation code and providing political subdivisions and the State Board of Education authority to adopt their own code or a modified version of the state code. Effective January 1978, a code based on the Model Code for Energy Conservation (MCEC) went into effect. In July 1993 the Uniform Building Standards Act was amended to provide that the Division of Professional Licensing, along with the Building Code Commission, adopt by rule the specific edition of the National Electrical Code (NEC), Uniform Building Code (UBC), Uniform Mechanical Code (UMC), and Uniform Plumbing Code (UPC) to be used as the state standard. Power was also given to adopt successor editions of the adopted codes. On February 14, 1995, amendments adopted Appendix Chapter 13 of the 1994 UBC with a sole reference to the 1993 MEC for low-rise residential buildings and a sole reference to ASHRAE/IESNA 90.1-1989 for high-rise residential and commercial buildings. Amendments to Appendix Chapter 13, Section 1302.2, of the UBC were adopted effective July 1, 1998, indicating low-rise residential buildings shall be designed to comply with the requirements of the 1995 MEC. Commercial and high-rise residential buildings shall be designed to comply with the requirements of the Energy Code for Commercial and High-Rise Residential Building, which is a codification of ASHRAE/IESNA 90.1-1989, Energy Efficient Design of New Buildings except Low-Rise Residential Buildings. The 1995 Council of American Building Officials (CABO) Model Energy Code (MEC) was amended in Section 502.2.1 by referring to different requirements for metal stud framing. Specifically, the Uw (thermal transmittance for an opaque wall [w]) for a metal stud wall must be as published in the ASHRAE Handbook of Fundamentals, using an approved ASHRAE series or parallel approach calculation, or U-values shown in the "Users Manual for ASHRAE/IESNA 90.1-1989." The codified version of ASHRAE/IESNA Standard 90.1-1989 was amended to allow building officials to approve designs which do not conform where in his/her opinion full compliance is physically and/or economically impractical. On January 1, 2007, the 2006 IECC with reference to ASHRAE 90.1-2004 became effective. Effective May 12, 2009, the Utah State Legislature became the exclusive authority for the adoption of the building codes, including an energy code. On July 1, 2010, the 2009 IECC with reference to ASHRAE 90.1-2007 became effective with the following state-wide amendment "IRC, Chapter 11, is deleted and replaced with Chapter 11 of the 2006 IRC and Chapter 4 of the 2006 IECC".

On October 20, 2010, Utah legislators turned down the adoption of the 2009 IECC for residential buildings. In January of 2012 it was reintroduced in Bill 262.

On March 20, 2015, 2012 IECC with by reference to ASHRAE 90.1-2010 with amnendments and 2012 IECC with amendments for residential and became effective July 1, 2015.