is a home rule state regarding construction code adoption, i.e., there is no
statewide adoption, and each city and county adopts their own codes. At its October 9, 2018 public hearing, the
City of Tucson adopted the 2018 International (I) Codes as well as the 2017
National Electrical Code. Tucson was previously
on the 2012 I-codes and the 2011 NEC, so they are skipping the 2015 I-codes and
2014 NEC and are adopting the most current editions. The new codes will be effective in Tucson on
January 1, 2019.
(pop. 520,000) joins the City of Phoenix (pop. 1,626,000) in adopting these new
codes. Phoenix likewise moved from the 2012
I-codes and 2011 NEC to the 2018 I-codes and 2017 NEC with an effective date of
September 1, 2018. Tucson and Phoenix
are the two largest cities in Arizona, and most other major jurisdictions in
Arizona are expected to adopt the new codes as well.
information can be found at the following websites: