Missouri has no mandatory or voluntary statewide energy code for private residential and commercial construction.
Following the Executive Order 09-18 signed on April 23, 2009, all new state construction, buildings being constructed for lease by the state, and significant renovations and replacement of energy-using equipment shall be at least as stringent as the most recent energy efficiency standards of the International Energy Conservation Code (IECC). Exemptions shall be limited to those listed in the IECC and exemptions approved by the Director of Facilities Management, Design and Construction.
Due to its history of strong local government, Missouri does not have a mandatory statewide energy code. However, however all local jurisdictions except class III counties have the right to adopt an energy code. As expected, this system creates a sometimes confusing patchwork of different codes throughout the state. See this page or see below for more details on local adoption.
Regardless of the system in place, the bottom line is that many jurisdictions in Missouri still don’t have an energy code—meaning that many residents do not receive the benefits of energy-efficient construction.
Missouri has considered adopting a state code previously. For example, SB 745, drafted by BCAP in 2010, would have adopted the 2009 IECC and ASHRAE Standard 90.1-2007 statewide. It also would have directed DNR to establish an automatic review cycle, either every three years or within nine months of the publication of a new model code version. In addition, HB 938 in 2011 would have established most of the 2006 International Code series as minimum statewide construction standards (the 2006 IECC was not specifically cited, but would have been included via its position as an alternative compliance path to Chapter 11 of the 2006 International Residential Code). Both bills, however, failed to move past the committee stage.
State buildings are being designed to the 2012 IECC.
Local Adoption: For more, view the BCAP Missouri Gap Analysis Report, starting with pages 19-22.
All local jurisdictions except class III counties have the right to adopt an energy code. As expected, this system creates a sometimes confusing patchwork of different codes throughout the state.
It is typical for Missouri communities to adopt codes on a 6-year cycle rather than the 3-year code development cycle for ICC. It is also typical for communities to follow the code adoption of surrounding communities. These adoption practices have developed two trends in Missouri; eastern Missouri communities are generally on the 2003 I-Codes and are moving/have moved to the 2009 I-Codes and western Missouri communities are generally on the 2006 I-Codes and are moving to the 2012 I-Codes.
On Nov. 7, 2012, The City of Hazelwood in St. Louis County adopted the 2009 IECC and the 2009 IRC (previously on the 2003 I-codes). It has been adopted with a single amendment of the basement insulation requirements only applying if there is 4 ft or more of above-ground exposure.