As a home rule state, mandatory building energy codes are adopted and enforced on a local level. As of September 2014, 25 communities in Arizona have adopted the 2012 International Energy Conservation Code (IECC), and 52% of all new construction activity in the state occurs in jurisdictions under the 2012 IECC. Visit the website of the International Code Council at www.iccsafe.org for up-to-date jurisdictional adoption information.
In 2001, Arizona enacted legislation encouraging local governments to voluntarily adopt the 2000 International Energy Conservation Code (IECC) for residential construction and ASHRAE Standard 90.1-1999 for commercial construction. The state does require that its own buildings comply with ASHRAE Standard 90.1-1999, the most recent and model standard for energy efficiency in commercial buildings. In addition, legislation adopted in 2003 requires state agencies and universities to achieve a 10% reduction in energy use per unit of floor area by 2008, and a 15% reduction by 2011.
On February 11, 2005, Gov. Janet Napolitano signed Executive Order 2005-05, requiring all new state-funded buildings constructed after February 11, 2005, to achieve at least a Silver LEED green building rating and meet the energy requirements of ASHRAE 90.1-2004.
On December 1, 2011 Tucson and Pima County released their voluntary Net-Zero Energy Building Code. The goal of the project was to develop a building standard that provides a prescriptive set of rules for designing a building that generates as much energy as it consumes. There is also a performance path in the code using Energy Modeling. The communities have a goal to adopt this code as the base code in two code cycles. In the interim the standard is voluntary for builders who would like to build net zero energy buildings.