Building Codes Atlas
IBC, IRC, NEC, IFC, and IECC adoption across 51 states and 156 cities.
Overview
IBC, IRC, NEC, IFC, and IECC adoption across 51 states and 156 cities. Which edition is your jurisdiction on?
States + DC
51
Cities tracked
156
Local amendments
8
Statewide states
40
Code adoption by edition
IBC ›International Building Code
| Edition | States | Cities |
|---|---|---|
| 2012 | 2 | 6 |
| 2015 | 3 | 6 |
| 2018 | 8 | 28 |
| 2021 | 23 | 84 |
| 2023 | 0 | 1 |
| 2024 | 8 | 31 |
IRC ›International Residential Code
| Edition | States | Cities |
|---|---|---|
| 2012 | 1 | — |
| 2015 | 3 | — |
| 2018 | 11 | — |
| 2021 | 21 | — |
| 2024 | 5 | — |
NEC ›National Electrical Code (NFPA 70)
| Edition | States | Cities |
|---|---|---|
| 2008 | 2 | — |
| 2014 | 1 | — |
| 2017 | 2 | — |
| 2020 | 17 | — |
| 2023 | 25 | — |
IFC ›International Fire Code
| Edition | States | Cities |
|---|---|---|
| 2012 | 1 | — |
| 2015 | 3 | — |
| 2018 | 4 | — |
| 2021 | 18 | — |
| 2024 | 8 | — |
| 2025 | 1 | — |
IECC ›International Energy Conservation Code
| Edition | States | Cities |
|---|---|---|
| 2006 | 1 | — |
| 2009 | 3 | — |
| 2010 | 1 | — |
| 2012 | 2 | — |
| 2015 | 3 | — |
| 2017 | 1 | — |
| 2018 | 7 | — |
| 2021 | 18 | — |
| 2024 | 8 | — |
| 2025 | 1 | — |
Governance models
How each state regulates code adoption. Statewide mandatory states set a single edition; home-rule states let cities adopt independently.
40
Statewide mandatory
AK, AL, AR, CA, CT, DE, FL, GA, IA, ID, IN, KY, LA, MA, MD, ME, MI, MN, MT, NC, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SC, UT, VA, VT, WA, WI, WV, WY
9
Home rule
AZ, CO, IL, KS, MO, MS, SD, TN, TX
2
Other
DC, HI
Local amendments
8 cities with documented local code amendments or overrides.
| City | State | Note |
|---|---|---|
| Los Angeles | CA | Significant local amendments to CBC, CRC, CMC, CPC |
| San Francisco | CA | Significant local amendments; does NOT adopt the CRC |
| Olathe | KS | — |
| New Orleans | LA | — |
| Baltimore | MD | — |
| Yonkers | NY | — |
| Memphis | TN | — |
| Seattle | WA | — |