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Building Energy Codes Program

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Residential State Codes

Residential Code: REScheck shows compliance: Enforcement Status: Approximate Stringency: Residential Code Notes:
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 2006 IECC State-developed code, Part 6 of Title 24, which exceeds 2006 IECC is mandatory statewide.
The 2008 Building Energy Effiicency Standards were adopted on April 23, 2008 and will go into effect on August 1, 2009.
Colorado 2003 IECC Yes Voluntary Without Amendments As stringent as the 2003 IECC 2003 IECC mandatory in any area that does not adopt or enforce local codes.
Connecticut 2003 IECC Yes Mandatory Without Amendments As stringent as the 2003 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
Florida State Specific Code No Mandatory With Amendments More stringent than the 2006 IECC State-developed code (Chapter 13 of the Florida Building Code), which exceeds 2006 IECC is mandatory statewide.
Georgia 2006 IECC Yes Mandatory With Amendments As stringent as the 2006 IECC 2006 IECC with Georgia State Supplements and Amendments 2008, effective Jan. 1, 2008. REScheck currently does not support GA's 2006 Energy Code.
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. Kaui County currently does not have residential energy code provisions.
Iowa 2006 IECC Yes Mandatory With Amendments As stringent as the 2006 IECC IECC section 403.2.2 is amended with the addition of two sentences. The new section 403.2.2with the additional wording reads as follows:
Strike section 403.2.2 and adopt the following new section 403.2.2 in lieu thereof:
403.2.2 Sealing. All ducts, air handlers, filter boxes, and building cavities used as ducts shall be sealed. Joints and seams shall comply with Section M1601.3.1 of the International Residential Code. Air handlers with a manufacturer�s designation for an air leakage of no more than 2 percent of the design air flow rate when tested at an air pressure of 1�inch water gauge when all air inlets, air outlets, and condensate drain port(s) are sealed shall be deemed sealed. Air handlers with filter boxes shall be tested with the filter box in place.
Idaho 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC 2006 IECC effective Jan. 1, 2008 (previous code 2003 IECC)
Illinois None Yes Voluntary Without Amendments No Information None - The state of Illinois supports a Home Energy Rating System.
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 2006 IECC Yes Mandatory With Amendments As stringent as the 2006 IECC Effective July 1, 2008, when using REScheck, the 2006 IECC code option should be chosen for compliance. The MA code option will be removed.
Maryland 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 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 Yes Mandatory With Amendments More stringent than the 95 MEC Minnesota State Building Code, based on the 1995 MEC. MN will be implementing a new Residential Energy Code based on Chapter 11 of the 2006 IRC with amendments effective June 1, 2009. 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 Without Amendments Unique stringent than the PRIOR 92 MEC State-developed code, which adopts the 1989 CABO One- and Two-Family Dwelling Code is mandatory for all new and remodeled residential buildings.
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 2003 IECC State-developed code, modeled on the 2003 IECC with amendments & Chapter 11 of 2003 IRC with amendments. Effective Jan. 1, 2009 REScheck for the 2006 IECC shall be permitted to demonstrate compliance, except that a 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. Builders may use the old code based on the 2003 IECC until June 30, 2009.
North Dakota None Yes Voluntary Without Amendments No Information 1993 MEC 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 2006 IECC effective Aug. 17, 2007 an update from 2000 IECC
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 April 1, 2008, the 2008 Oregon Residential Energy Code requirements were adopted with an interim compliance period through July 1, 2008. The new residential code requirements can be viewed at the following link: 2008 Residential Energy Code Requirements
Pennsylvania 2006 IECC Yes Mandatory With Amendments As stringent as the 2006 IECC 2006 IECC and/or 2006 IRC, Chapter 11.

Adherence to Pennsylvania's Alternative Residential Energy Provisions 2006 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 Less stringent than the 2006 IECC
South Carolina State Specific Code Yes Mandatory With Amendments Unique stringent than the PRIOR 92 MEC A residential building is considered in compliance with the Building Envelope Requirements of the Energy Code if: (1) it is built in compliance with prescriptive standards issued by the South Carolina Residential Builders Commission, in consultation with the State Energy Office, based on computer models of the Energy Code including, but not limited to, options developed by Pacific Northwest National Laboratories, or other nationally recognized laboratories which use the standards developed by Pacific Northwest National Laboratories, for South Carolina's climatic zones, or (2) if double pane or single pane with storm windows are used for window glass and in the case of ceilings, exterior walls, floors with crawl space, and heating and air conditioning duct work, the determination of the minimum thermal resistance ratings (R-value) is: (a) R-30 for ceilings, except for ceiling/roof combinations, which must be at least R-19; (b) R-13 for exterior walls; (c) R-19 for floors with crawl space; (d) R-6, or the installed equivalent, for heating and air conditioning duct work not located in conditioned space.
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 Voluntary With Amendments Unique stringent than the PRIOR 92 MEC 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:
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.
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 04 State-developed code, Part 6 of Title 24, which meets or exceeds ASHRAE/IESNA 90.1-2004, is mandatory statewide.
The 2008 Building Energy Effiicency Standards were adopted on April 23, 2008 and will go into effect on August 1, 2009.
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 2003 IECC Yes Mandatory Without Amendments As stringent as the 2003 IECC 2003 IECC with reference to ASHRAE 90.1-2001.
District of Columbia 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC
Delaware ASHRAE 99 Yes Mandatory Without Amendments As stringent as the ASHRAE 99 ASHRAE 90.1-1999 provided that the respective county and municipality government shall exclude agricultral structures from the provisions.
Florida State Specific Code No Mandatory With Amendments More stringent than the ASHRAE 04 State-developed code, which meets or exceeds ASHRAE/IESNA 90.1-2004 is mandatory statewide.
Georgia 2006 IECC Yes Mandatory With Amendments More stringent than the 2006 IECC Can show compliance with IECC 2006 or 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 Honolulu, Maui, and Kaui County require compliance with ASHRAE 90.1-1999. Hawaii County requires compliance with ASHRAE 90.1-1989.
Iowa 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC 2006 IECC with reference to ASHRAE 90.1-2004
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 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 IECC
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 ASHRAE 04 Elements from both the ASHRAE/IESNA 90.1--2004 and the International Energy Conservative Code (IECC), with state specific amendments. The new baseline (IECC-06 + 07 Supplement or 90.1-07) effective 10/6/08
Maryland 2006 IECC Yes Mandatory Without Amendments As stringent as the 2006 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 89 Minnesota State Building Code, based on ASHRAE/IESNA 90.1-1989. MN will be implementing a new Commercial Energy Code based on ASHRAE Standard 90.1-2004 with amendments effective June 1, 2009. 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, except state-owned buildings must comply with ASHRAE/IESNA 90.1-1989.
Commonwealth of the Northern Mariana Islands State Specific Code No Mandatory Without Amendments Unique stringent than the PRIOR 90A90B State-developed code, which adopts the 1991 Uniform Building Code is mandatory for all new and remodeled multi-family and commercial buildings.
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. Adoption of the 2009 IECC with amendments currently in review.
North Carolina State Specific Code Yes Mandatory With Amendments As stringent as the ASHRAE 04 State-developed code, modeled on the 2006 IECC with amendments including ASHRAE/IESNA 90.1-2004. Designers, builders may use the old code based on the 2003 IECC until June 30, 2009.
North Dakota None Yes Voluntary Without Amendments No Information ASHRAE/IESNA 90.1-1989 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 reference to ASHRAE 90.1-2004 effective Aug. 17, 2007; an update from 2000 IECC
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 ASHRAE 04 Yes Mandatory With Amendments As stringent as the ASHRAE 04 COMcheck can be used for envelope and mechanical only.
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 State-developed code that meets or exceeds ASHRAE/IESNA 90.1-2004 is mandatory statewide.
Pennsylvania 2006 IECC Yes Mandatory With Amendments As stringent as the 2006 IECC 2006 IECC with reference to ASHRAE 90.1-2004
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 With reference to ASHRAE 90.1-2004
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 ASHRAE 04 Yes Mandatory With Amendments As stringent as the ASHRAE 04
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 Voluntary 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.