State |
Current Commercial Code |
Current Residential Code |
Next Code Update |
| Alabama | 2015 Alabama Commercial Energy Code Based on ASHRAE 90.1-2013 Effective 1/1/2016 |
2015 Alabama Residential Energy Code Based on the 2015 IECC with state-specific amendments Effective 10/1/2016 |
The Alabama Energy and Residential Codes Board is reviewing the 2021 IECC for potential adoption in 2025. |
| Alaska | No statewide energy code Alaska Building Energy Efficiency Standard (BEES) (2012 IECC, ASHRAE 62.2-2010, Alaska-specific amendments) Effective 7/1/2013 |
No statewide energy code Alaska Building Energy Efficiency Standard (BEES) (2012 IECC, ASHRAE 62.2-2010, Alaska-specific amendments) Effective 7/1/2013 |
The Alaska Housing Finance Corporation is evaluating updates to BEES, considering the 2021 IECC, with potential implementation by 2026. |
| Arizona | No statewide energy code | No statewide energy code | Several municipalities, including Phoenix and Tucson, have adopted the 2018 IECC; statewide adoption remains under consideration. |
| Arkansas | Arkansas Energy Code for New Building Construction Based on 2009 IECC with state supplements and amendments Effective 1/1/2015 |
Arkansas Energy Code for New Building Construction Based on 2009 IECC with state supplements and amendments Effective 1/1/2015 |
The Arkansas Energy Office is in the process of adopting the 2021 IECC, with an anticipated effective date in 2025. |
| California | 2022 Building Energy Efficiency Standards (Title 24) Exceeds ASHRAE 90.1-2019 Effective 1/1/2023 |
2022 Building Energy Efficiency Standards (Title 24) Exceeds 2018 IECC Effective 1/1/2023 |
The California Energy Commission is developing the 2025 standards, expected to take effect on January 1, 2026. |
| Colorado | No statewide energy code | No statewide energy code | Major cities like Denver have adopted the 2018 IECC; statewide adoption discussions are ongoing. |
| Connecticut | 2022 Connecticut State Building Code Based on the 2021 IECC Effective 10/1/2022 |
2022 Connecticut State Building Code Based on the 2021 IECC Effective 10/1/2022 |
The Connecticut Codes and Standards Committee reviews codes triennially; the next update is anticipated in 2025. |
| Delaware | Delaware State Energy Code Based on 2018 IECC with amendments and ASHRAE 90.1-2016 Effective 12/11/2020 |
Delaware State Energy Code Based on 2018 IECC with amendments Effective 12/11/2020 |
The Delaware Energy Office reviews codes every three years; adoption of the 2021 IECC is under consideration for 2025. |
| District of Columbia | 2020 DC Energy Conservation Code Based on the 2018 IECC and ASHRAE 90.1-2016 Effective 5/29/2020 |
2020 DC Energy Conservation Code Based on the 2018 IECC with amendments Effective 5/29/2020 |
The Construction Codes Coordinating Board is reviewing the 2021 IECC for potential adoption in 2025. |
| Florida | 2020 Florida Building Code, Energy Conservation (FBCEC) Based on the 2018 IECC with Florida-specific amendments Effective 12/31/2020 |
2020 Florida Building Code, Energy Conservation (FBCEC) Based on the 2018 IECC with Florida-specific amendments Effective 12/31/2020 |
The 7th Edition (2023) of the Florida Building Code is under development, with an expected effective date in late 2025. |
| Georgia | 2020 Georgia State Minimum Standard Energy Code Based on the 2015 IECC with Georgia-specific amendments Effective 1/1/2020 |
2020 Georgia State Minimum Standard Energy Code Based on the 2015 IECC with Georgia-specific amendments Effective 1/1/2020 |
The Georgia Department of Community Affairs is considering adoption of the 2021 IECC, with potential implementation in 2025. . See A Statement on Codes from the DCA, page 1. |
| Hawaii | 2020 IECC with state-specific amendments Effective 3/1/2021 |
2020 IECC with state-specific amendments Effective 3/1/2021 |
No scheduled update. |
| Idaho | 2018 IECC with state-specific amendments Effective 1/1/2022 |
2018 IECC with state-specific amendments Effective 1/1/2022 |
The Idaho Building Code Board is reviewing the 2021 IECC for potential adoption in 2025. |
| Illinois | 2021 IECC and ASHRAE 90.1-2019 with state-specific amendments Effective 1/1/2024 |
2021 IECC with state-specific amendments Effective 1/1/2024 |
The Illinois Energy Conservation Code is updated triennially; next update expected in 2027. |
| Indiana | 2010 Indiana Energy Conservation Code, based on ASHRAE 90.1-2007 with state-specific amendments Effective 5/6/2010 |
2023 Indiana Residential Energy Code, based on the 2018 IECC with state-specific amendments Effective 1/1/2023 |
No additional updates are scheduled currently. |
| Iowa | 2021 IECC with state-specific amendments Effective 6/1/2024 |
2023 Indiana Residential Energy Code, based on the 2018 IECC with state-specific amendments Effective 1/1/2023 |
No additional updates are scheduled currently. |
| Kansas | No statewide energy code | No statewide code; a significant number of jurisdictions have adopted an energy code for residential construction | Several municipalities, such as Wichita, have adopted the 2018 IECC. |
| Kentucky | 2018 Kentucky Building Code, based on the 2015 IECC Effective 1/1/2021 |
2018 Kentucky Residential Code, based on the 2015 IECC Effective 1/1/2021 |
The Kentucky Department of Housing, Buildings, and Construction is reviewing the 2021 IECC for potential adoption. |
| Louisiana | 2015 IECC with state-specific amendments Effective 1/1/2023 |
2015 IECC with state-specific amendments Effective 1/1/2023 |
No update scheduled. |
| Maine | Maine Uniform Building and Energy Code (MUBEC), based on the 2015 IECC and ASHRAE 90.1-2013 Effective 7/1/2020 |
Maine Uniform Building and Energy Code (MUBEC), based on the 2015 IECC Effective 7/1/2020 |
Adoption of the 2021 IECC is under consideration for 2025. |
| Maryland | Maryland Building Performance Standards, based on the 2018 IECC Effective 3/1/2022 |
Maryland Building Performance Standards, based on the 2018 IECC Effective 3/1/2022 |
Next review is expected in 2025, considering the 2021 IECC. |
| Massachusetts | 10th Edition of the Massachusetts Energy Code, based on the 2021 IECC and ASHRAE 90.1-2019 Effective 1/1/2023 |
10th Edition of the Massachusetts Energy Code, based on the 2021 IECC Effective 1/1/2023 |
No update scheduled. |
| Michigan | 2021 Michigan Uniform Energy Code (MUEC), based on the 2021 IECC and ASHRAE 90.1-2019 Effective 3/1/2024 |
2021 Michigan Residential Code, based on the 2021 IECC Effective 3/1/2024 |
No additional updates scheduled. |
| Minnesota | Minnesota Commercial State Building Code, Chapter 1323, based on the 2018 IECC Effective 3/31/2020 |
Minnesota Residential State Building Code, based on the 2018 IECC Effective 3/31/2020 |
The Minnesota Department of Labor and Industry is reviewing the 2021 IECC for potential adoption by 2025. |
| Mississippi | Â 2015 IECC with state-specific amendments Effective 1/1/2023 |
No mandatory code; ASHRAE 90.1-2010 is voluntary for residential projects | No update scheduled. |
| Missouri | No statewide energy code | No statewide energy code | Several jurisdictions, including Kansas City and St. Louis, have adopted the 2018 IECC. |
| Montana | 2018 IECC with Montana-specific amendments Effective 7/1/2022 |
2018 IECC with Montana-specific amendments Effective 7/1/2022 |
The Montana Department of Labor and Industry is reviewing the 2021 IECC for potential adoption in 2025. |
| Nebraska | 2021 Nebraska Energy Code, based on the 2021 IECC Effective 7/1/2024 |
2021 Nebraska Energy Code, based on the 2021 IECC Effective 7/1/2024 |
No update scheduled. |
| Nevada | 2021 IECC with Nevada-specific amendments Effective 1/1/2024 |
2021 IECC with Nevada-specific amendments Effective 1/1/2024 |
Next review in 2027. |
| New Hampshire | 2021 IECC with state-specific amendments Effective 7/1/2023 |
2021 IECC with state-specific amendments Effective 7/1/2023 |
Next review expected in 2026. |
| New Jersey | Uniform Construction Code (NJAC 5:23-3.18), based on the 2021 IECC and ASHRAE 90.1-2019 Effective 7/1/2024 |
Uniform Construction Code (NJAC 5:23-3.18) based on the 2021 IECC Effective 7/1/2024 |
No update scheduled. |
| New Mexico | 2021 New Mexico Energy Conservation Code (NMECC), based on the 2021 IECC Effective 1/1/2024 |
2021 New Mexico Energy Conservation Code (NMECC), based on the 2021 IECC Effective 1/1/2024 |
No update scheduled. |
| New York | Energy Conservation Construction Code of New York State (ECCCNYS),New York State (ECCCNYS), based on the 2021 IECC and ASHRAE 90.1-2019 Effective 7/1/2023 |
Energy Conservation Construction Code of New York State (ECCCNYS), New York State (ECCCNYS), based on the 2021 IECC Effective 7/1/2023 |
Next update scheduled for 2027. |
| North Carolina | 2024 North Carolina Energy Conservation Code (based on the 2021 IECC) Effective 1/1/2024 |
2024 North Carolina Energy Conservation Code (based on the 2021 IECC) Effective 1/1/2024 |
No additional updates scheduled. |
| North Dakota | 2024 North Carolina Energy Conservation Code (based on the 2021 IECC) Effective 1/1/2024 |
North Dakota State Building Code; energy provisions are voluntary only and based on the 2018 IECC Effective 1/1/2022 |
No additional updates scheduled. |
| Ohio | Ohio Building Code (OBC) Chapter 13, Chapter 13, based on the 2018 IECC and ASHRAE Standard 90.1-2016 Effective 7/1/2022 |
2018 Residential Code of Ohio, based on the 2018 IECC Effective 7/1/2022 |
Next review expected in 2026. |
| Oklahoma | 2021 Oklahoma Uniform Building Code Effective 7/1/2023 |
2021 Oklahoma Uniform Building Code Effective 7/1/2023 |
Next review expected in 2026. |
| Oregon | 2021 Oregon Energy Efficiency Specialty Code (OEESC), based on ASHRAE 90.1-2019 Effective 4/1/2023 |
2021 Oregon Residential Specialty Code (ORSC), more stringent than the 2018 IECC Effective 4/1/2023 |
The next review cycle is anticipated in 2026, following Oregon’s triennial review process. |
| Pennsylvania | 2021 IECC with Pennsylvania-specific amendments Effective 2/14/2022 |
2021 IECC with Pennsylvania-specific amendments Effective 2/14/2022 |
The Pennsylvania Uniform Construction Code Review Committee evaluates updates every three years. |
| Rhode Island | SBC-8 State Energy Conservation Code Based on the 2021 IECC and ASHRAE 90.1-2019 Effective 2/1/2024 |
Rhode Island One- and Two-Family Dwelling Code Based on the 2021 IECC with state-specific amendments Effective 2/1/2024 |
Next review anticipated in 2027. |
| South Carolina | South Carolina Energy Standard Based on the 2018 IECC, with ASHRAE 90.1-2016 as a compliance path Effective 1/1/2021 |
South Carolina Energy Standard Based on the 2018 IECC Effective 1/1/2021 |
Review of the 2021 IECC is underway, with possible adoption in 2025. |
| South Dakota | 2021 IBC with amendments, adopted locally Effective 7/1/2023 |
South Dakota Residential Energy Conservation Standard Voluntary, based on the 2015 IECC Effective 7/1/2023 |
No update scheduled. |
| Tennessee | 2018 IECC with state-specific amendments Effective 7/1/2021 |
2018 IECC with state-specific amendments Effective 7/1/2021 |
No updates planned. |
| Texas | 2021 IECC with Texas-specific amendments Effective 11/1/2022 |
Texas Building Energy Performance Standards for Single-Family Construction Based on the 2021 IRC Effective 11/1/2022 |
No updates planned. |
| Utah | 2021 IECC as written Effective 7/1/2023 |
2021 IECC with state-specific amendments Effective 7/1/2023 |
Next review of codes expected in 2025. |
| Vermont | Commercial Building Energy Standards (CBES) Based on the 2015 IECC , includes alternative compliance path of ASHRAE 90.1 2013 with some Vermont specific requirements Effective 3/1/2015 |
Residential Building Energy Standards (RBES) Based on the 2015 IECC Effective 3/1/2015 |
Utah reviews codes triennially; next update expected in 2026. |
| Virginia | Virginia Uniform Statewide Building Code (USBC), 2018 Edition Based on the 2018 IECC with amendments Effective 7/1/2021 |
Virginia Uniform Statewide Building Code (USBC), 2018 Edition Based on the 2018 IECC with amendments Effective 7/1/2021 |
Review of the 2021 IECC is ongoing, with anticipated implementation in 2025. |
| Washington | 2021 Washington State Energy Code (WSEC) Based on the 2021 IECC with state-specific amendments Effective 7/1/2023 |
2021 Washington State Energy Code (WSEC) Based on the 2021 IECC with state-specific amendments Effective 7/1/2023 |
Washington updates codes triennially; next update expected in 2026. |
| West Virginia | ASHRAE 90.1-2010 Effective 7/1/2021 |
2018 IECC Effective 7/1/2021 |
The West Virginia Fire Commission reviews codes irregularly, with no update currently scheduled. |
| Wisconsin | 2021 Wisconsin Commercial Building Code Based on the 2021 IECC Effective 7/1/2024 |
Wisconsin Uniform Dwelling Code, Chapter SPS 322 Based on the 2021 IECC Effective 7/1/2024 |
Wisconsin follows a three-year review cycle; next review expected in 2027. |
| Wyoming | No statewide code | No statewide code | Local jurisdictions may adopt codes independently; Cheyenne has adopted the 2018 IECC. |
| American Samoa | No energy code for private sector construction | No energy code for private sector construction | No update scheduled. |
| Guam | 2018 IBC with reference to the 2018 IECC Effective 1/1/2023 |
2018 IBC with reference to the 2018 IRC Effective 1/1/2023 |
No update scheduled. |
| Northern Mariana Islands | Tropical Model Energy Code Equivalent to the 2015 IECC Effective 1/1/2023 |
Tropical Model Energy Code Equivalent to the 2015 IECC Effective 1/1/2023 |
No update scheduled. |
| Puerto Rico | 2018 Puerto Rico Building Code Based on the 2018 IECC Effective 1/1/2023 |
2018 Puerto Rico Building Code Based on the 2018 IECC Effective 1/1/2023 |
Next update review expected in 2026. |
| Virgin Islands | 2021 IECC Effective 1/1/2023 |
2021 IECC Effective 1/1/2023 |
No update scheduled. |
Cosimina has been a member of BCAP for over a decade, actively contributing to the organization’s nationally acclaimed initiatives aimed at assisting states and local authorities in the establishment and enforcement of robust and efficient building energy codes. Her involvement spans across advocacy, technical guidance, outreach programs, and the formation of strategic coalitions.