Resources
US Building Code Adoption by State
Which edition of the IBC, IRC, IECC and the rest of the I-Codes each US state is recorded as adopting — with the record's date on the page and the state source to confirm it against.
On this page
“Which code applies?” is the first question on any project and the one most often answered from memory. It has three parts, and only the first is national: which edition the jurisdiction adopted, when it became effective, and which amendments ride on top of it.
These pages answer the first part for all fifty states and the District of Columbia from the ICC Master I-Code Adoption Chart, reproduced with the chart's own legend so that an “X” — some jurisdictions, not all buildings — is never mistaken for a statewide adoption. The chart is dated January 2024, and that date is printed on every page rather than hidden, because ICC itself notes that not every jurisdiction reports its adoptions.
The other two parts cannot be answered nationally, so each page ends where the answer actually lives: the state's own current-code publication, the amendment list, and a worksheet for recording what the authority having jurisdiction confirmed.
Prepared by Harth as generated collection navigation. Evidence and review scope are recorded on each linked page.
Pages
- Alabama Building Code: Which Editions Are Adopted
- Alaska Building Code: Which Editions Are Adopted
- Arizona Building Code: Which Editions Are Adopted
- Arkansas Building Code: Which Editions Are Adopted
- California Building Code: Which Editions Are Adopted
- Colorado Building Code: Which Editions Are Adopted
- Connecticut Building Code: Which Editions Are Adopted
- Delaware Building Code: Which Editions Are Adopted
- District of Columbia Building Code: Which Editions Are Adopted
- Florida Building Code: Which Editions Are Adopted
- Georgia Building Code: Which Editions Are Adopted
- Hawaii Building Code: Which Editions Are Adopted
- Idaho Building Code: Which Editions Are Adopted
- Illinois Building Code: Which Editions Are Adopted
- Indiana Building Code: Which Editions Are Adopted
- Iowa Building Code: Which Editions Are Adopted
- Kansas Building Code: Which Editions Are Adopted
- Kentucky Building Code: Which Editions Are Adopted
- Louisiana Building Code: Which Editions Are Adopted
- Maine Building Code: Which Editions Are Adopted
- Maryland Building Code: Which Editions Are Adopted
- Massachusetts Building Code: Which Editions Are Adopted
- Michigan Building Code: Which Editions Are Adopted
- Minnesota Building Code: Which Editions Are Adopted
- Mississippi Building Code: Which Editions Are Adopted
- Missouri Building Code: Which Editions Are Adopted
- Montana Building Code: Which Editions Are Adopted
- Nebraska Building Code: Which Editions Are Adopted
- Nevada Building Code: Which Editions Are Adopted
- New Hampshire Building Code: Which Editions Are Adopted
- New Jersey Building Code: Which Editions Are Adopted
- New Mexico Building Code: Which Editions Are Adopted
- New York Building Code: Which Editions Are Adopted
- North Carolina Building Code: Which Editions Are Adopted
- North Dakota Building Code: Which Editions Are Adopted
- Ohio Building Code: Which Editions Are Adopted
- Oklahoma Building Code: Which Editions Are Adopted
- Oregon Building Code: Which Editions Are Adopted
- Pennsylvania Building Code: Which Editions Are Adopted
- Rhode Island Building Code: Which Editions Are Adopted
- South Carolina Building Code: Which Editions Are Adopted
- South Dakota Building Code: Which Editions Are Adopted
- Tennessee Building Code: Which Editions Are Adopted
- Texas Building Code: Which Editions Are Adopted
- Utah Building Code: Which Editions Are Adopted
- Vermont Building Code: Which Editions Are Adopted
- Virginia Building Code: Which Editions Are Adopted
- Washington Building Code: Which Editions Are Adopted
- West Virginia Building Code: Which Editions Are Adopted
- Wisconsin Building Code: Which Editions Are Adopted
- Wyoming Building Code: Which Editions Are Adopted
- Alabama Building Code: Which Editions Are Adopted
Alabama adopted code editions from the ICC January 2024 chart: 2021 IBC, 2015 IRC — with the state source to confirm against.
- Alaska Building Code: Which Editions Are Adopted
Alaska adopted code editions from the ICC January 2024 chart: 2021 IBC, Some jurisdictions only IRC — with the state source to confirm against.
- Arizona Building Code: Which Editions Are Adopted
Arizona: No statewide building code; every city and county adopts its own. Checked 2026-09-08 against the state source, with the cross-state ICC record for comparison.
- Arkansas Building Code: Which Editions Are Adopted
Arkansas adopted code editions from the ICC January 2024 chart: 2021 IBC, 2021 IRC — with the state source to confirm against.
- California Building Code: Which Editions Are Adopted
California adopted code editions from the ICC January 2024 chart: 2021 IBC, 2021 IRC — with the state source to confirm against.
- Colorado Building Code: Which Editions Are Adopted
Colorado building code: No statewide building code; local jurisdictions adopt, with a state-mandated energy-code floor. Checked 2026-09-08 against the state source.
- Connecticut Building Code: Which Editions Are Adopted
Connecticut: 2022 Connecticut State Building Code, effective 1 October 2022. Checked 2026-09-08 against the state source, with the cross-state ICC record for comparison.
- Delaware Building Code: Which Editions Are Adopted
Delaware adopted code editions from the ICC January 2024 chart: No statewide IBC, Some jurisdictions only IRC — with the state source to confirm against.
- District of Columbia Building Code: Which Editions Are Adopted
District of Columbia adopted code editions from the ICC January 2024 chart: 2015 IBC, 2015 IRC — with the state source to confirm against.
- Florida Building Code: Which Editions Are Adopted
Florida: Florida Building Code, 8th Edition (2023), effective 31 December 2023. Checked 2026-09-08 against the state source, with the cross-state ICC record for comparison.
- Georgia Building Code: Which Editions Are Adopted
Georgia adopted code editions from the ICC January 2024 chart: 2018 IBC, 2018 IRC — with the state source to confirm against.
- Hawaii Building Code: Which Editions Are Adopted
Hawaii adopted code editions from the ICC January 2024 chart: 2018 IBC, 2018 IRC — with the state source to confirm against.
- Idaho Building Code: Which Editions Are Adopted
Idaho adopted code editions from the ICC January 2024 chart: 2018 IBC, 2018 IRC — with the state source to confirm against.
- Illinois Building Code: Which Editions Are Adopted
Illinois building code: No statewide building code; a statewide energy code based on the 2021 IECC took effect 1 January 2024. Checked 2026-09-08 against the state source.
- Indiana Building Code: Which Editions Are Adopted
Indiana adopted code editions from the ICC January 2024 chart: 2012 IBC, 2018 IRC — with the state source to confirm against.
- Iowa Building Code: Which Editions Are Adopted
Iowa adopted code editions from the ICC January 2024 chart: 2015 IBC, 2015 IRC — with the state source to confirm against.
- Kansas Building Code: Which Editions Are Adopted
Kansas building code: No statewide commercial building code; only the Kansas Fire Prevention Code is mandatory statewide. Checked 2026-09-08 against the state source.
- Kentucky Building Code: Which Editions Are Adopted
Kentucky adopted code editions from the ICC January 2024 chart: 2015 IBC, 2015 IRC — with the state source to confirm against.
- Louisiana Building Code: Which Editions Are Adopted
Louisiana adopted code editions from the ICC January 2024 chart: 2021 IBC, 2021 IRC — with the state source to confirm against.
- Maine Building Code: Which Editions Are Adopted
Maine adopted code editions from the ICC January 2024 chart: 2015 IBC, 2015 IRC — with the state source to confirm against.
- Maryland Building Code: Which Editions Are Adopted
Maryland building code: 2021 I-Codes as the Maryland Building Performance Standards, effective 29 May 2023. Checked 2026-09-08 against the state source.
- Massachusetts Building Code: Which Editions Are Adopted
Massachusetts adopted code editions from the ICC January 2024 chart: 2015 IBC, 2015 IRC — with the state source to confirm against.
- Michigan Building Code: Which Editions Are Adopted
Michigan adopted code editions from the ICC January 2024 chart: 2015 IBC, 2015 IRC — with the state source to confirm against.
- Minnesota Building Code: Which Editions Are Adopted
Minnesota adopted code editions from the ICC January 2024 chart: 2018 IBC, 2018 IRC — with the state source to confirm against.
- Mississippi Building Code: Which Editions Are Adopted
Mississippi adopted code editions from the ICC January 2024 chart: 2018 IBC, 2018 IRC — with the state source to confirm against.
- Missouri Building Code: Which Editions Are Adopted
Missouri adopted code editions from the ICC January 2024 chart: No statewide IBC, Some jurisdictions only IRC — with the state source to confirm against.
- Montana Building Code: Which Editions Are Adopted
Montana adopted code editions from the ICC January 2024 chart: 2021 IBC, 2021 IRC — with the state source to confirm against.
- Nebraska Building Code: Which Editions Are Adopted
Nebraska adopted code editions from the ICC January 2024 chart: 2018 IBC, 2018 IRC — with the state source to confirm against.
- Nevada Building Code: Which Editions Are Adopted
Nevada building code: 2021 IECC adopted statewide effective 28 July 2021; building codes are otherwise adopted locally. Checked 2026-09-08 against the state source.
- New Hampshire Building Code: Which Editions Are Adopted
New Hampshire adopted code editions from the ICC January 2024 chart: 2018 IBC, 2018 IRC — with the state source to confirm against.
- New Jersey Building Code: Which Editions Are Adopted
New Jersey adopted code editions from the ICC January 2024 chart: 2021 IBC, 2021 IRC — with the state source to confirm against.
- New Mexico Building Code: Which Editions Are Adopted
New Mexico adopted code editions from the ICC January 2024 chart: 2015 IBC, 2015 IRC — with the state source to confirm against.
- New York Building Code: Which Editions Are Adopted
New York adopted code editions from the ICC January 2024 chart: 2018 IBC, 2018 IRC — with the state source to confirm against.
- North Carolina Building Code: Which Editions Are Adopted
North Carolina adopted code editions from the ICC January 2024 chart: 2021 IBC, 2021 IRC — with the state source to confirm against.
- North Dakota Building Code: Which Editions Are Adopted
North Dakota adopted code editions from the ICC January 2024 chart: 2021 IBC, 2021 IRC — with the state source to confirm against.
- Ohio Building Code: Which Editions Are Adopted
Ohio adopted code editions from the ICC January 2024 chart: 2015 IBC, 2018 IRC — with the state source to confirm against.
- Oklahoma Building Code: Which Editions Are Adopted
Oklahoma adopted code editions from the ICC January 2024 chart: 2018 IBC, 2018 IRC — with the state source to confirm against.
- Oregon Building Code: Which Editions Are Adopted
Oregon adopted code editions from the ICC January 2024 chart: 2021 IBC, 2021 IRC — with the state source to confirm against.
- Pennsylvania Building Code: Which Editions Are Adopted
Pennsylvania adopted code editions from the ICC January 2024 chart: 2018 IBC, 2018 IRC — with the state source to confirm against.
- Rhode Island Building Code: Which Editions Are Adopted
Rhode Island adopted code editions from the ICC January 2024 chart: 2018 IBC, 2018 IRC — with the state source to confirm against.
- South Carolina Building Code: Which Editions Are Adopted
South Carolina building code: 2021 South Carolina codes, adopted 6 October 2021 and effective 1 January 2023. Checked 2026-09-08 against the state source.
- South Dakota Building Code: Which Editions Are Adopted
South Dakota adopted code editions from the ICC January 2024 chart: 2021 IBC, 2021 IRC — with the state source to confirm against.
- Tennessee Building Code: Which Editions Are Adopted
Tennessee adopted code editions from the ICC January 2024 chart: 2012 IBC, 2018 IRC — with the state source to confirm against.
- Texas Building Code: Which Editions Are Adopted
Texas adopted code editions from the ICC January 2024 chart: 2012 IBC, 2012 IRC — with the state source to confirm against.
- Utah Building Code: Which Editions Are Adopted
Utah adopted code editions from the ICC January 2024 chart: 2021 IBC, 2021 IRC — with the state source to confirm against.
- Vermont Building Code: Which Editions Are Adopted
Vermont adopted code editions from the ICC January 2024 chart: 2015 IBC, Some jurisdictions only IRC — with the state source to confirm against.
- Virginia Building Code: Which Editions Are Adopted
Virginia building code: 2021 Virginia Uniform Statewide Building Code (USBC), effective 18 January 2024. Checked 2026-09-08 against the state source.
- Washington Building Code: Which Editions Are Adopted
Washington adopted code editions from the ICC January 2024 chart: 2018 IBC, 2018 IRC — with the state source to confirm against.
- West Virginia Building Code: Which Editions Are Adopted
West Virginia adopted code editions from the ICC January 2024 chart: 2018 IBC, 2018 IRC — with the state source to confirm against.
- Wisconsin Building Code: Which Editions Are Adopted
Wisconsin adopted code editions from the ICC January 2024 chart: 2015 IBC, Not adopted IRC — with the state source to confirm against.
- Wyoming Building Code: Which Editions Are Adopted
Wyoming adopted code editions from the ICC January 2024 chart: 2021 IBC, Some jurisdictions only IRC — with the state source to confirm against.