In 1972 the General Assembly of the state of Iowa passed House File 6, an Act to institute an Iowa building code to ensure the health, safety, and welfare of its citizens. House File 6 became known as Iowa Code Chapter 103A. The first energy code was established in 1978, based on the National Conference of States on Building Codes and Standards Model Code for Energy Conservation. Since that time, the Iowa building code has been updated based on the latest edition of the MEC and its successor code, the International Energy Conservation Code (IECC).
On October 21, 2009 the Iowa Building Code Advisory Council, after previously issuing a notice of intended action (NIA), approved the adoption of several amendments to the State Building Code, including the adoption of the 2009 IECC effective January 1, 2010 (with a three month transition period during which the previous code, the 2006 IECC, may still be used).
The energy efficiency section (Chapter 11) of the 2009 IRC has been deleted and replaced with e a reference to the 2009 IECC. Residential sprinkler requirements have been postponed until January 1, 2013.