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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 | None | 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. |
| 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 | 2000 IECC | Yes | Mandatory Without Amendments | As stringent as the 2000 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 Without Amendments | As stringent as the 2006 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 | 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. |
| Massachusetts | State Specific Code | Yes | Mandatory With Amendments | As stringent as the 2003 IRC | New code for Single and Two-Family Dwellings effective April 1, 2007 with a concurrency period where a code user may choose to either use the Sixth or Seventh Edition of the code; due to expire Jan. 1, 2008. The REScheck, MA code option currently shows compliance to the Sixth Edition which is based on the 95 MEC with amendments. The Seventh Edition is based on the 2003 IRC with amendments. |
| 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. |
| Michigan | State Specific Code | No | Mandatory With Amendments | Less stringent than the 92 MEC | Michigan Uniform Energy Code Part 10 Rules, less stringent than 1992 MEC. |
| Minnesota | State Specific Code | Yes | Mandatory With Amendments | More stringent than the 95 MEC | Minnesota State Building Code, based on the 1995 MEC. |
| 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. Prescriptive statewide requirements of SHGC 0.40 & U-value of 0.4 or better, trade-off between building envelope and HVAC equipment not allowed. |
| 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 | 2003 IECC | Yes | Mandatory Without Amendments | As stringent as the 2003 IECC | |
| Nevada | 2003 IECC | Yes | Mandatory With Amendments | As stringent as the 2003 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.
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| New York | 2004 IECC | Yes | Mandatory With Amendments | As stringent as the 2004 IECC | 2004 IECC w/amendments. |
| Ohio | 2003 IECC | Yes | Mandatory Without Amendments | As stringent as the 2003 IECC | Effective March 31, 2008, Ohio's rules adopting the 2006 IECC for one-, two-, and three-family dwellings have been amended to revert back to the 2003 IECC until further study of the 2006 IECC can be completed. |
| Oklahoma | None | Yes | Mandatory Without Amendments | No Information | Oklahoma and Tulsa City adopted the 2003 IRC. |
| Oregon | State Specific Code | No | Mandatory With Amendments | More stringent than the 2003 IECC | State-developed code that exceeds 2003 IECC is mandatory statewide. |
| 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 Without Amendments | As stringent as the 2006 IECC | |
| South Carolina | State Specific Code | No | Mandatory With Amendments | As stringent as the 2003 IECC | |
| South Dakota | None | No | None Without Amendments | No Information | None. |
| Tennessee | 92 MEC | Yes | Voluntary Without Amendments | As stringent as the 92 MEC | Local jurisdictions have the option of upgrading the energy efficiency code to 2000 IECC with 2001 Amendments. |
| 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 | 2003 IECC | Yes | Mandatory Without Amendments | As stringent as the 2003 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 2000 IECC | State-developed code (COMM 22), which meets or exceeds 1995 MEC for 1-2 family dwelling (can use REScheck when use of WI code is designated); Multi-family dwellings must meet compliance with 2006 IECC (can use REScheck when use of 2006 IECC code is designated) |
| West Virginia | 2003 IRC | Yes | Voluntary With Amendments | As stringent as the 2003 IRC | 2003 IRC with reference to 2003 IECC for compliance. |
| 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 |
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| 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 | None | 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. |
| 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 | 2000 IECC | Yes | Mandatory Without Amendments | As stringent as the 2000 IECC | including reference to ASHRAE 90.1-1999 |
| 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 | None | Yes | None Without Amendments | No Information | 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. |
| Maryland | 2006 IECC | Yes | Mandatory Without Amendments | As stringent as the 2006 IECC | |
| Maine | ASHRAE 04 | Yes | Mandatory With Amendments | As stringent as the ASHRAE 04 | ASHRAE/IESNA 90.1-2004 |
| 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. |
| 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 2006 IECC with amendments effective March 2008. |
| North Carolina | State Specific Code | Yes | Mandatory With Amendments | As stringent as the ASHRAE 04 | State-developed code, modeled on the 2003 IECC with amendments including ASHRAE/IESNA 90.1-2004. |
| 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 | 2003 IECC | Yes | Mandatory Without Amendments | As stringent as the 2003 IECC | |
| Nevada | 2003 IECC | Yes | Mandatory With Amendments | As stringent as the 2003 IECC | 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 | ASHRAE 04 | Yes | Mandatory Without Amendments | As stringent as the ASHRAE 04 | 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 Without Amendments | As stringent as the 2006 IECC | With reference to ASHRAE 90.1-2004 |
| South Carolina | 2003 IECC | Yes | Mandatory Without Amendments | As stringent as the 2003 IECC | 2003 IECC with reference to ASHRAE 90.1-2001. 2006 IECC becomes effective July 1, 2008. |
| South Dakota | None | No | None Without Amendments | No Information | None. |
| Tennessee | 90A90B | No | Voluntary Without Amendments | As stringent as the 90A90B | Local jurisdictions have the option of upgrading the energy efficiency code to 2000 IECC with 2001 amendments. |
| 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 | 2003 IECC with reference to ASHRAE 90.1-2004 effective November 2005 |
| 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. |