International Energy Conservation Code, residential
IECC residential adoption by state
Which IECC residential edition each of the 49 jurisdictions enforces: the 48 contiguous states and the District of Columbia. Of the 49 values, 28 come from the state’s own records, verified or partial. The other 21 are tracker leads or have no data yet. Data as of .
Editions in force
| Edition in force | Total | Verified or partial |
|---|---|---|
| 2024 IECC | 7 | 4 |
| 2021 IECC | 11 | 8 |
| 2018 IECC | 7 | 3 |
| 2015 IECC | 7 | 4 |
| 2012 IECC | 2 | 1 |
| 2009 IECC | 4 | 3 |
| Local adoption | 7 | 2 |
| State’s own code | 2 | 2 |
| Edition not known | 2 | 1 |
Every jurisdiction
| State | Edition in force | In force since | How it was checked |
|---|---|---|---|
| Alabama | 2015 IECC | No date on record | Lead only |
| Arizona | Local adoption | No date on record | Partial |
| Arkansas | 2009 IECC | Not researched yet | Lead only |
| California | State’s own code | Verified | |
| Colorado | 2024 IECC | Partial | |
| Connecticut | 2021 IECC | Verified | |
| Delaware | 2024 IECC | Not researched yet | Lead only |
| District of Columbia | 2015 IECC | Not researched yet | Lead only |
| Florida | 2021 IECC | Verified | |
| Georgia | 2015 IECC | Partial | |
| Idaho | 2018 IECC | Not researched yet | Lead only |
| Illinois | 2024 IECC | Verified | |
| Indiana | 2018 IECC | Partial | |
| Iowa | 2012 IECC | Not researched yet | Lead only |
| Kansas | Local adoption | Not researched yet | Lead only |
| Kentucky | 2009 IECC | Partial | |
| Louisiana | 2021 IECC | Partial | |
| Maine | 2021 IECC | Not researched yet | Lead only |
| Maryland | 2021 IECC | Verified | |
| Massachusetts | 2021 IECC | Verified | |
| Michigan | 2015 IECC | Verified | |
| Minnesota | 2012 IECC | Partial | |
| Mississippi | Local adoption | Not researched yet | Lead only |
| Missouri | Local adoption | No date on record | Partial |
| Montana | 2021 IECC | Not researched yet | Lead only |
| Nebraska | 2018 IECC | Not researched yet | Lead only |
| Nevada | 2024 IECC | Not researched yet | Lead only |
| New Hampshire | 2018 IECC | Not researched yet | Lead only |
| New Jersey | 2024 IECC | Verified | |
| New Mexico | 2021 IECC | Not researched yet | Lead only |
| New York | 2024 IECC | Verified | |
| North Carolina | 2015 IECC | Verified | |
| North Dakota | Local adoption | Not researched yet | Lead only |
| Ohio | 2018 IECC | Verified | |
| Oklahoma | Edition not known | No date on record | Lead only |
| Oregon | State’s own code | Partial | |
| Pennsylvania | 2021 IECC | Verified | |
| Rhode Island | 2024 IECC | Not researched yet | Lead only |
| South Carolina | 2009 IECC | Verified | |
| South Dakota | Local adoption | Not researched yet | Lead only |
| Tennessee | 2018 IECC | Partial | |
| Texas | 2015 IECC | Verified | |
| Utah | Edition not known | No date on record | Partial |
| Vermont | 2018 IECC | Not researched yet | Lead only |
| Virginia | 2021 IECC | Verified | |
| Washington | 2021 IECC | Verified | |
| West Virginia | 2015 IECC | Not researched yet | Lead only |
| Wisconsin | 2009 IECC | Verified | |
| Wyoming | Local adoption | Not researched yet | Lead only |
A row marked Lead only shows the edition a tracker lists. That is a cross-check, not the state’s own record.
How these values were checked
- Verified17 valuesTwo separate readings of the state’s own record agree, and the passage is on file word for word.
- Partial11 valuesResearched in the state’s own record. The seal stays broken until the passage is on file word for word.
- Lead only21 valuesA tracker lists this edition. Nobody has checked it against the state’s own record yet.