from The Building Codes Assistance Project

Missouri is playing catch up in the energy codes department. http://bcap-energy.org/ is the site that published the info listed below. I will add some maps, too, which show which states are leading in energy code adoption. There is a lot to gain...

Code Status: Missouri
This page contains information about current energy codes in the state of Missouri. Information for all 50 States is also available. Missouri Code News.
*Missouri Fact Sheet*
Current State Codes
Code Adoption & Change Process
Energy Consumption Estimates
Construction Activity
Web Links
State Energy Code Contacts
Current State Codes
Residential Code: None statewide. State-owned single-family and multi-family residential buildings must comply with the latest edition of the MEC or ANSI/ASHRAE Standard 90.2-1993.
Commercial Code: None statewide. State-owned buildings must comply with ASHRAE/IESNA 90.1-1989 until July 1, 2009, when all state buildings must comply with the 2006 IECC.
Code Change Cycle: No set schedule. Most recent update was adopted on January 26, 1996.
Jurisdictions: (Information last updated August 13, 2008. See ICC Online for up-to-date jurisdictional adoption information).
2006 IECC: Clayton, Wentzville
2004 IECC Supplement: St. Louis
2003 IECC: Eldon, Farmington, Florissant, Gladstone, Hannibal, Hazelwood, Highlandville, Jackson County Public Works, Jefferson County, Kirksville, Kirkwood, Loch Lloyd, Mexico, Neosho, Pineville, Sni Valley FPD, St. Charles, St. Louis County, Troy
2000 IECC: Cass County, Warrensburg
Other local code: Belton, Fenton, Higginsville, Kansas City, Knob Noster

Code Adoption & Change Process
Process Type: Legislative
Code Change Process: The promulgation of a statewide energy code must proceed through the state legislature.
State Code History: All state-owned buildings must comply with ASHRAE 90.1-1989. After the passage of SB 1181 in July 2008, all state buildings must comply with the 2006 IECC beginning on July 1, 2009.
Currently, only the counties of Clay (Kansas City metro area) and Jefferson (St. Louis metro area) are authorized, without voter approval, to adopt building and construction regulations; require building permits; license certain building contractors; require inspections; establish and collect fees for permits, licenses, and inspections; and appoint a building commission to oversee these regulations, permits, licenses, and inspections. SB 1181 expanded that authority to include the adoption of regulations for electrical wiring and installation and the licensing of individuals to make them consistent with the authority granted to all other first and second classification counties.

Energy Consumption Estimates
The consumption estimates below are derived from the total end use of residential and commercial energy consumption in the United States in 2006, and are not limited to energy consumption based on building code-related factors. Source: U.S. Energy Information Administration.
Residential Sector: 491.0 Trillion BTU
Commercial Sector: 391.4 Trillion BTU
Total Energy Consumption: 882.4 Trillion BTU

Construction Activity
Residential:
Population (2000 US Census)1: 5,595,211
Total Housing Units2: 2,503,187
2004 New Housing Units Authorized by Permit (Privately Owned)3:
total units: 31,036
1 unit: 25,185
2 units: 1,546
3 and 4 units: 880
5+ units: 3,425
structures of 5+ units: 227
References:
http://www.census.gov/population/cen2000/phc-t2/tab01.xls
http://www.census.gov/population/estimates/housing/sthuhh1.txt
http://www.census.gov/const/C40/Table2/20k_t2yu200412.txt
Green Building Initiatives
32 Leadership in Energy and Environmental Design (LEED) Certified Buildings
ENERGY STAR Qualified New Homes Market Index less than 3%
49 ENERGY STAR Labeled Buildings and Plants

Code Funding Opportunities
There are two funding opportunities under the American Recovery and Reinvestment Act of 2009 (ARRA): Energy Efficiency and Conservation Block Grants and State Energy Program. Please reference the U.S. Department of Energy for Missouri's allocated amount and updated information.

Web Links
Energy Center
Missouri Legislature