Hawaii In July 2015, the Hawaii State Building Code Council unanimously approved the 2015 International Energy Conservation Code (IECC) with amendments. The code sets energy efficiency requirements for both residential and commercial buildings. Read more about this code here. Maryland On January 1, 2015, the State of Maryland adopted the 2015 IECC with local adoption and enforcement required by July 1, 2015. It was the first state to adopt the most recent model energy code. New Jersey In Septemb...