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Residential State Codes

Residential Code: REScheck shows compliance: Enforcement Status: Approximate Stringency: Residential Code Notes:
None No Without Amendments As stringent as the
Alaska State Specific Code No Mandatory With Amendments As stringent as the 2006 IECC The Building Energy Efficiency Standard (BEES) uses the 2006 International Energy Conservation Code, with Alaska Specific Amendments. This is the mandatory minimum energy efficiency standard for construction using state financing programs.
Alabama State Specific Code Yes Voluntary With Amendments No Information Residential Energy Code for Alabama (RECA), a voluntary state developed code equivalent to the IECC 2000 without SHGC 0.40 is contingent upon local adoption. Four jurisdictions have adopted the International codes, including IECC 2000 without tampering with the low solar heat gain low-e window requirements.
Arkansas State Specific Code Yes Mandatory With Amendments Less stringent than the 2003 IECC Amendment excludes compliance to the .40 SHGC in hdd areas less than 3,500.
American Samoa None No None Without Amendments No Information None.
Arizona None Yes Voluntary Without Amendments No Information 2006 IECC: Avondale, Coconino County, El Mirage, Flagstaff,Pinal County, Pima County, Buckeye, Duncan, Goodyear, Oro Valley, Phoenix, Marana, Tolleson, Scottsdale, Colorado City, Florence, Ft.Mojave, Fountain Hills, LaPaz County, Paradise Valley, Queen Creek, Sahuratia, Surprise
2003 IECC: Benson, Carefree, Clarkdale, Cochise County, Peoria, Queen Creek, Scottsdale, Show Low, Sierra Vista, Surprise, Tuscon, Graham County
California State Specific Code No Mandatory With Amendments More stringent than the 2009 IECC The 2008 Building Energy Efficiency Standards is a State-developed code, Part 6 of Title 24, effective Jan. 1, 2010.
Colorado 2003 IECC Yes Voluntary Without Amendments As stringent as the 2003 IECC 2003 IECC mandatory in any area that does adopt or enforce local codes. Vail has adopted the 2009 IECC.
Connecticut 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC
District of Columbia State Specific Code Yes Mandatory With Amendments More stringent than the 2006 IECC 2006 IECC with amendments to include provisions from the 2009 IECC.
Delaware 2000 IECC Yes Mandatory Without Amendments As stringent as the 2000 IECC 2009 IECC effective July 1, 2010
Florida State Specific Code No Mandatory With Amendments More stringent than the 2006 IECC State-developed code with compliance methods similar to the 2006 IECC. Approx. 95% of residences comply by the performance method. The standard of performance is more stringent than Sec. 405 of the 2009 IECC. Criteria are tailored to Florida's hot and humid climate. State computer program required for compliance calculations and documentation. State-developed code (Chapter 13 of the Florida Building Code). Exceeds the 2006 IECC by 17% and about 3% less than 2009 IECC. See the report at http://www.fsec.ucf.edu/en/publications/pdf/FSEC-CR-1806.pdf
Georgia 2006 IECC Yes Mandatory With Amendments More stringent than the 2006 IECC 2006 IECC with 2008 and 2009 Georgia State Supplements and Amendments, effective Jan. 1, 2008. Georgia State Supplements and Amendments are not cumulative. Both the 2008 and 2009 amendments to the 2006 IECC must be used to show compliance.
Guam 93 MEC Yes Mandatory Without Amendments As stringent as the 93 MEC 1993 MEC.
Hawaii None Yes Voluntary Without Amendments No Information Honolulu and Maui County require R-19 or equivalent in roofs of new residences. Hawaii County requires R-19 in the roofs and R-11 in the walls for homes that are centrally air conditioned.
Iowa 2009 IECC Yes Mandatory With Amendments As stringent as the 2009 IECC
Idaho 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC 2006 IECC effective Jan. 1, 2008 (previous code 2003 IECC)
Illinois 2009 IECC Yes Mandatory Without Amendments As stringent as the 2009 IECC On Friday, August 28, Illinois’ Governor Pat Quinn signed the Energy Efficient Building Act into law. The Act established a statewide residential energy code, which requires that newly constructed residential buildings meet the minimum standards set forth in the most recent version of the International Energy Conservation Code (2009 IECC).
"Residential building" means (i) a detached one-family or 2-family dwelling or (ii) any building that is 3 stories or less in height above grade that contains multiple dwelling units, in which the occupants reside on a primarily permanent basis, such as a townhouse, a row house, an apartment house, a convent, a monastery, a rectory, a fraternity or sorority house, a dormitory, and a rooming house; provided, however, that when applied to a building located within the boundaries of a municipality having a population of 1,000,000 or more, the term "residential building" means a building containing one or more dwelling units, not exceeding 4 stories above grade, where occupants are primarily permanent.
Indiana State Specific Code No Mandatory With Amendments As stringent as the 92 MEC Indiana Energy Conservation Code (1992 Model Energy Code with Indiana amendments)
Kansas None Yes None Without Amendments No Information Homebuilders or realtors must disclose information about the home energy performance parameters on the Kansas Energy Efficiency Disclosure form and provide it to potential buyers.
Kentucky 2006 IRC Yes Mandatory With Amendments As stringent as the 2006 IRC 2006 IRC with Kentucky Amendments
Louisiana 2006 IRC Yes Mandatory With Amendments As stringent as the 2006 IRC 2006 IRC with direct reference to 2006 IECC. 2006 IRC with amendments. All AC duct insulation is R6 instead of R8 and to include Section R301.2.1.1 of the 2003 edition of the IRC in lieu of Section R301.2.1.1 of the 2006 edition. The code adopted and amended above in this Subsection shall remain in effect until the 2009 edition of the IRC is published, at which time such edition of the code shall be adopted by the council as provided in Subparagraph (A)(3)(a) of this Section. Thereafter, the council shall adopt the latest edition of the IRC as provided in Subparagraph (A)(3)(a) of this Section."
Massachusetts State Specific Code Yes Mandatory With Amendments As stringent as the 2009 IECC MA's Board of Building Regulations and Standards (BBRS) has amended the code as of Jan. 1, 2010, requiring the use of the 2009 IECC with MA's amendments instead of the 2006 IECC. BBRS is allowing a six month concurrency period through June 1, 2010 during which either the 2006 IECC with 2007 Supplement and MA's amendments or the 2009 IECC and MA amendments may be used.

When using REScheck, the 2009 IECC code option should be chosen for compliance.

93.07 Energy Conservation - 2009 IECC
Maryland 2009 IECC Yes Mandatory Without Amendments As stringent as the 2009 IECC
Maine None Yes Mandatory With Amendments No Information State-developed code called the Maine Model Building Energy Code, based on the 2003 IECC, which sets a minimum standard if a jurisdiction adopts a code. If a town adopted a building energy code prior to the July 27, 2005, it may retain that code, but any code adopted after the rule's effective date must be the Maine Model Building Energy Code. A town may adopt only portions of the Maine Model Building Energy Code or may adopt amendments to the Code. Not mandatory statewide. 2003 IECC: Biddeford, Portland
Michigan 2003 IRC Yes Mandatory With Amendments As stringent as the 2003 IRC 2003 IRC, with amendments
Minnesota State Specific Code No Mandatory With Amendments More stringent than the 2006 IRC New Residential Energy Code based on Chapter 11 of the 2006 IRC with amendments. Full Code text can be viewed at https://www.revisor.leg.state.mn.us/rules/?id=1322&view=chapter
Missouri None No None Without Amendments No Information 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.
Commonwealth of the Northern Mariana Islands State Specific Code No Mandatory With Amendments Unique stringent than the 2009 IECC
Mississippi PRIOR 92 MEC No Voluntary Without Amendments Less stringent than the PRIOR 92 MEC State energy code, based on ASHRAE Standard 90-1975, is adopted by local jurisdictions.
Montana 2003 IECC Yes Mandatory With Amendments As stringent as the 2003 IECC 2003 IECC with amendments: (1) Basement wall insulation maybe delayed until space is finished. (2) Log walls are exempt from R-value requirements. (3) All residential buildings must have an energy component label, listing insulation levels, window and heating and water heating efficiencies to be placed in/on the electrical panel.
North Carolina State Specific Code Yes Mandatory With Amendments As stringent as the 2006 IECC The most recent version of REScheck is recommended instead of version 4.0.0 cited in NC's Code; due to minor bug fixes and enhancements to the software. State-developed code, modeled on the 2006 IECC with amendments & Chapter 11 of 2006 IRC with amendments. SHGC of 0.4 is required for all zones and that envelope requirements may not be traded off against the use of high efficiency heating and cooling equipment. No trade-off calculations are required for termite inspection and treatment gaps required for slabs and basement walls.
North Dakota None Yes Voluntary Without Amendments No Information Chapter 11 of 2009 IRC is contingent on adoption by local jurisdiction
Nebraska 2003 IECC Yes Mandatory Without Amendments As stringent as the 2003 IECC
New Hampshire 2006 IECC Yes Mandatory With Amendments As stringent as the 2006 IECC State Amendments Notes: Entire State is Zone 6. Sec 403.4.1 Circulating Hot water systems. Circulating domestic hot water pipes shall be insulated to a minimum of R-4 and non-circulating domestic hot water pipes in unconditioned spaces shall be insulated to a minimum of R-4.
New Jersey 2006 IECC Yes Mandatory With Amendments Unique stringent than the 2006 IECC When showing compliance to their new energy code using REScheck, the 2003 IECC code option should be used rather than 2006 IECC and compliance should exceed 2003 IECC by two percent or more.

Previous code was based on 1995 CABO MEC with New Jersey modifications.

New Mexico 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC
Nevada 2006 IECC Yes Mandatory With Amendments As stringent as the 2006 IECC The cities of Las Vegas, North Las Vegas, Henderson, Mesquite, Boulder City, and Clark County have adopted the Southern Nevada Energy Code based on the 2006 IECC with amendments with an effective date of May 1, 2007. REScheck and COMcheck can be used for envelope and mechanical only. Carson City/County, Washoe County, Reno and Sparks will adopt the 2006 IECC for residential and commercial buildings in March 2008.
New York 2004 IECC Yes Mandatory With Amendments As stringent as the 2004 IECC 2004 IECC w/amendments.
Ohio 2006 IECC Yes Mandatory With Amendments As stringent as the 2006 IECC On Jan. 1, 2009, the Ohio Board of Building Standards re-adopted the 2006 IECC and added an additional prescriptive option for demonstrating energy code compliance for one-two and three family dwellings. The new prescriptive table is found in Chapter 11 (section 1104) of the Residential Code of Ohio. http://www.com.state.oh.us/dic/Documents/bbst_PARTA-Residential.pdf
Oklahoma None Yes Mandatory Without Amendments No Information Oklahoma and Tulsa City adopted the 2003 IRC.
Oregon State Specific Code No Mandatory With Amendments As stringent as the 2006 IECC 2008 Oregon Residential Specialty Code requirements are based on the 2006 IRC and can be viewed at the following link: 2008 Residential Energy Code Requirements . State developed CodeComp software may be used to show compliance. Residential code to be updated in April 2011.
Pennsylvania 2009 IECC Yes Mandatory With Amendments As stringent as the 2009 IECC 2009 IECC, 2009 IRC, Chapter 11, and/or PA-Alt.

PA-Alt: Adherence to Pennsylvania's Alternative Residential Energy Provisions 2009 is an acceptable means of demonstrating compliance with the energy conservation code requirements of the Uniform Construction Code.
Puerto Rico State Specific Code No Mandatory With Amendments Less stringent than the 95 MEC The Code for Energy Conservation in Puerto Rico, based on ASHRAE/IESNA 90.1-1989, is mandatory for the entire island of Puerto Rico.
Rhode Island 2006 IECC Yes Mandatory With Amendments As stringent as the 2006 IECC
South Carolina 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC SC State Legislature passed a bill to mandate the 2006 IECC for all new and renovated buildings effective July 1, 2009.

This bill removes the residential compliance option which would have weakened the energy savings achievable through the 2006 IECC.
South Dakota None No None Without Amendments No Information None.
Tennessee 2003 IECC Yes Mandatory Without Amendments As stringent as the 2003 IECC
Texas 2001 IECC Yes Mandatory Without Amendments As stringent as the 2001 IECC 2000 IECC with 2001 Supplement
Utah 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC
Virginia 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC
U.S. Virgin Islands 2003 IECC Yes None Without Amendments As stringent as the 2003 IECC
Vermont State Specific Code Yes Mandatory With Amendments More stringent than the 2000 IECC Based upon the 2000 IECC and Vermont's amendments.
Washington State Specific Code No Mandatory With Amendments More stringent than the 2006 IECC State-developed and implemented code. Most recent updates effective July 1, 2007. Exceeds 2006 IECC standards for most homes.
Wisconsin State Specific Code Yes Mandatory With Amendments As stringent as the 2006 IECC State-developed code (COMM 22), which meets or exceeds 2006 IECC for 1-2 family dwelling
West Virginia State Specific Code Yes Mandatory With Amendments Unique stringent than the 2003 IECC The state of West Virginia adopted the 2003 International Residential Code and the 2003 International Energy Conservation Code with amendments during the 2006 legislative session. The codes were adopted on March 11, 2006; they became effective May 15, 2006.
West Virginia code is available online through a link available from the Secretary of State's Office at http://www.wvsos.com/csr/verify.asp?TitleSeries=87-04. For information on building regulations and codes, contact the West Virginia Fire Commission at (304) 558-2191.
Wyoming None No Voluntary Without Amendments As stringent as the PRIOR 92 MEC The ICBO Uniform Building Code, which is based on the 1989 MEC, may be adopted and enforced by local jurisdictions.

Commercial State Codes
Commercial Code: COMcheck shows compliance: Enforcement Status: Approximate Stringency: Commercial Code Notes:
None No Without Amendments As stringent as the
Alaska None No None Without Amendments No Information None statewide. All public facilities must be designed to comply with the thermal and lighting energy standards adopted by the Alaska Department of Transportation and Public Facilities under AS44.42.020(a)(14).
Alabama State Specific Code Yes Mandatory With Amendments No Information The Alabama Building Energy Conservation Code (ABECC) is a mandatory building code for state government buildings, administered by the Alabama Building Commission. The latest version of the Code (ABECC 2004) , which is based on ASHRAE/IESNA 90.1-2001, was adopted in March 2005 and was implemented by the Alabama Building Commission in September 2005. In November of 2008 The Alabama Building Commission adopted the 2006 IECC as the mandatory code for buildings constructed or remodeled using state funds. Enforcement of the new code began on December 1, 2008.
Arkansas 2003 IECC Yes Mandatory Without Amendments As stringent as the 2003 IECC ASHRAE/IESNA 90.1-2001, which is referenced by the 2003 IECC.
American Samoa None No None Without Amendments No Information None.
Arizona None Yes Voluntary Without Amendments No Information State-owned or -funded buildings, must comply with ASHRAE/IESNA 90.1-1999.
2006 IECC: Pima County, Buckeye, Duncan, Oro Valley, Phoneix, and Scottsdale
2003 IECC: Benson, Carefree, Clarkdale, Cochise County, Goodyear, Peoria, Queen Creek, Scottsdale, Show Low, Sierra Vista, Surprise, Tuscon
2000 IECC: Florence, Pinal County
California State Specific Code No Mandatory With Amendments More stringent than the ASHRAE 07 The 2008 Building Energy Efficiency Standards is a State-developed code, Part 6 of Title 24, effective Jan. 1, 2010.
Colorado 2003 IECC Yes Voluntary Without Amendments As stringent as the 2003 IECC Voluntary state provisions are based on 2003 IECC with reference to ASHRAE 90.1-2001
Connecticut 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC 2006 IECC with reference to ASHRAE 90.1-2004
District of Columbia 2006 IECC Yes Mandatory With Amendments As stringent as the 2006 IECC 2006 IECC with an amendment to reference ASHRAE 90.1-2007.
Delaware 2001 IECC Yes Mandatory Without Amendments As stringent as the 2001 IECC ASHRAE 90.1-2007 effective July 1, 2010 The respective county and municipality government shall exclude agricultural structures from the provisions of the current and new codes.
Florida State Specific Code No Mandatory With Amendments More stringent than the ASHRAE 07 State-developed code. Compliance method consistent with ASHRAE 90.1 performance method (Ch. 11). Limited prescriptive compliance for shell buildings. Standard of performance more stringent than ASHRAE 90.1-2007. State computer program required for compliance calculations and documentation.
Georgia State Specific Code Yes Mandatory With Amendments More stringent than the 2006 IECC IECC 2006 with ASHRAE 90.1-2004 with Georgia state amendments, effective Jan. 1, 2008.
Guam ASHRAE 89 Yes Mandatory Without Amendments As stringent as the ASHRAE 89 ASHRAE/IESNA 90.1-1989.
Hawaii None Yes Voluntary Without Amendments No Information Kauai County adopted 2009 IECC. Honolulu and Maui, require compliance with ASHRAE 90.1-1999. Hawaii County requires compliance with 2006 IECC.
Iowa 2009 IECC Yes Mandatory With Amendments As stringent as the 2009 IECC 2009 IECC with reference to ASHRAE 90.1-2007
Idaho 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC 2006 IECC with ASHRAE 90.1-2004 reference effective Jan. 1, 2008 (previous code 2003 IECC)
Illinois 2009 IECC Yes Mandatory Without Amendments As stringent as the 2009 IECC The 2009 IECC with reference to ASHRAE Standard 90.1-2007 as a means for compliance.
Indiana State Specific Code No Mandatory With Amendments stringent than the 90A90B Indiana Energy Conservation Code (1992 Model Energy Code with Indiana amendments)
Kansas 2006 IECC No Mandatory Without Amendments As stringent as the 2006 IECC Kansas has adopted the 2006 IECC as the applicable energy efficiency standard for commercial and industrial structures in the state. No enforcement mechanism is provided in the statute (HB 2036).
Kentucky 2006 IECC Yes Mandatory With Amendments As stringent as the 2006 IECC
Louisiana ASHRAE 04 Yes Mandatory Without Amendments As stringent as the ASHRAE 04 2006 IECC used for low rise (3 stories or less) multi-unit residential construction.
Massachusetts State Specific Code Yes Mandatory With Amendments As stringent as the 2009 IECC MA's Board of Building Regulations and Standards (BBRS) has amended the code as of Jan. 1, 2010, requiring the use of the 2009 IECC with MA's amendments instead of the 2006 IECC. BBRS is allowing a six month concurrency period through June 1, 2010 during which either the 2006 IECC with 2007 Supplement and MA's amendments or the 2009 IECC and MA amendments may be used.

13.00 Energy Conservation - 2009 IECC
Maryland 2009 IECC Yes Mandatory Without Amendments As stringent as the 2009 IECC
Maine ASHRAE 01 Yes Mandatory With Amendments As stringent as the ASHRAE 01 New construction or substantial renovation of any commercial building undertaken after Jan. 1. 2004 must conform to ASHRAE Standard 90.1-2001 or 2003 IECC and ASHRAE Standard 62-2001. "Substantial Renovation" means any renovation for which the cost exceeds 50% of the buildings current value prior to renovation.
Michigan ASHRAE 99 Yes Mandatory With Amendments As stringent as the ASHRAE 99 ASHRAE 90.1-1999 is the current standard. The new rules were effective March 13, 2003.
Minnesota State Specific Code Yes Mandatory With Amendments More stringent than the ASHRAE 04 New Commercial Energy Code based on ASHRAE Standard 90.1-2004 with amendments. Amendments can be viewed at https://www.revisor.leg.state.mn.us/rules/?id=1323&view=chapter
Missouri None No None Without Amendments No Information None. Minimum energy efficiency standards for state buildings established by rule--compliance required--exemption, when. 8.812. 1. By January 1, 2009, the department shall establish, by rule, a minimum energy efficiency standard for construction of a state building over five thousand square feet, substantial renovation of a state building over five thousand square feet when major energy systems are involved or a building over five thousand square feet which the state or state agency considers for acquisition or lease. Such standard shall be at least as stringent as the International Energy Conservation Code 2006, or the latest version thereof.

2. All design which is initiated on or after July 1, 2009, for construction of a state building over five thousand square feet or substantial renovation of a state building over five thousand square feet when major energy systems are involved or any building over five thousand square feet which the state or state agency considers for acquisition or lease after July 1, 2009, shall meet applicable provisions of the minimum energy efficiency standard.

3. The commissioner of the office of administration may exempt any building from the requirements of subsection 2 of this section:

(1) When compliance with the minimum energy efficiency standard may compromise the safety of the building or any of its occupants; or

(2) When the cost of compliance is expected to exceed the projected energy cost savings gained.

Commonwealth of the Northern Mariana Islands State Specific Code No Mandatory With Amendments Unique stringent than the 2009 IECC
Mississippi None No None Without Amendments No Information 90-1975 is mandatory for state-owned buildings, public buildings, and high-rise buildings only.
Montana 2003 IECC Yes Mandatory Without Amendments As stringent as the 2003 IECC 2003 IECC with reference to ASHRAE 90.1-2001.
North Carolina State Specific Code Yes Mandatory With Amendments As stringent as the 2006 IECC State-developed code, modeled on the 2006 IECC with amendments including ASHRAE/IESNA 90.1-2004.
North Dakota None Yes Voluntary Without Amendments No Information Chapter 13 of 2009 IBC is contingent on adoption by local jurisdiction
Nebraska 2003 IECC Yes Mandatory Without Amendments As stringent as the 2003 IECC 2003 IECC with reference to ASHRAE 90.1-2001
New Hampshire 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC 2006 IECC with direct reference for compliance to ASHRAE Standard 90.1-2004.
State Amendments Notes: Entire State is Zone 6. 103.5 Compliance. Exception: Any structure three stories or less above grade plane in height and less than 4000 square feet in gross floor area is permitted to show compliance based on Chapter 4.
Sec 504.5.1 Circulating domestic hot water pipes shall be insulated to a minimum of R-4 and non-circulating domestic hot water pipes in unconditioned spaces shall be insulated to a minimum of R-4.
New Jersey ASHRAE 04 Yes Mandatory With Amendments As stringent as the ASHRAE 04 ASHRAE/IESNA 90.1-2004 with minor modifications.

Previous code was based on ASHRAE 90.1-1999.
New Mexico 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC
Nevada 2006 IECC Yes Mandatory With Amendments As stringent as the 2006 IECC 2006 IECC with reference to 90.1-2004
New York 2003 IECC Yes Mandatory With Amendments As stringent as the 2003 IECC 2003 IECC w/amendments.
Ohio 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC 2006 IECC with reference to ASHRAE 90.1-2004 became effective Sept. 6, 2005.
Oklahoma None Yes Mandatory Without Amendments No Information 2006 IBC adopted in 2007 with statewide default to the 2006 IECC for jurisdictions that have not adopted codes.
Oregon State Specific Code No Mandatory With Amendments More stringent than the ASHRAE 04 2007 Oregon Structural Specialty Code are based on the 2006 IBC State-developed code that meets or exceeds ASHRAE/IESNA 90.1-2004. State developed CodeComp software may be used to show compliance.
Effective July 1, 2010, 2009 IECC with amendments
Pennsylvania 2009 IECC Yes Mandatory With Amendments As stringent as the 2009 IECC 2009 IECC with reference to ASHRAE 90.1-2007
Puerto Rico State Specific Code No Mandatory With Amendments Less stringent than the ASHRAE 89 The Code for Energy Conservation in Puerto Rico, based on ASHRAE/IESNA 90.1-1989, is mandatory for the entire island of Puerto Rico.
Rhode Island 2006 IECC Yes Mandatory With Amendments As stringent as the 2006 IECC
South Carolina 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC
South Dakota None No None Without Amendments No Information None.
Tennessee 90A90B No Voluntary Without Amendments As stringent as the 90A90B
Texas 2001 IECC Yes Mandatory Without Amendments As stringent as the 2001 IECC 2000 IECC with 2001 Supplement
Utah 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC with reference to ASHRAE 90.1-2004
Virginia 2006 IECC Yes Mandatory With Amendments As stringent as the 2006 IECC
U.S. Virgin Islands 2003 IECC Yes None Without Amendments As stringent as the 2003 IECC
Vermont State Specific Code Yes Mandatory With Amendments More stringent than the 2004 IECC Based on 2004 IECC with amendments to include ASHRAE 90.1-2004
Washington State Specific Code No Mandatory With Amendments More stringent than the ASHRAE 04 State-developed code that meets or exceeds ASHRAE/IESNA 90.1-2004. Most recent updates effective July 1, 2007.
Wisconsin 2006 IECC Yes Mandatory With Amendments As stringent as the 2006 IECC 2006 IECC w/amendments; can use COMcheck for building envelope and for lighting. Set the code to be used with the "2006 IECC" or "ASHRAE 90.1-2004". Multi family buildings (3 stories or less, 3 dwellings or more) are considered commercial buildings in Wisconsin. REScheck may be used with these buildings if program is set for use with the "2006 IECC".
West Virginia 2003 IECC Yes Mandatory With Amendments As stringent as the 2003 IECC
Wyoming None No Voluntary Without Amendments As stringent as the PRIOR 90A90B The ICBO Uniform Building Code, which is based on the 1989 MEC, may be adopted and enforced by local jurisdictions.