International Residential Code IRC
Detached 1–2 family dwellings and townhouses up to 3 stories above grade. Anything larger falls under the IBC.
Overview
Detached 1–2 family dwellings and townhouses up to 3 stories above grade. Anything larger falls under the IBC.
Publisher
International Code Council (ICC)
Latest edition
2024
First published
2000
Cycle
Every 3 years
Why it matters
The IRC is where the for-sale single-family and townhouse rules live — floor loads, stair geometry, egress windows, R-values by climate zone. For build-to-rent horizontal developers, this is the governing code.
Adoption by edition
Each row is one published edition, with the states (and DC) that have adopted it as the statewide minimum. Click a postal code to jump to that state's code wiki.
| Edition | States | Adopting jurisdictions |
|---|---|---|
| 2024 | 8 | CA · GA · IA · NV · NY · ND · UT · WY |
| 2021 | 22 | AL · AR · CT · FL · LA · ME · MD · MA · MT · NH · NJ · NM · OH · OR · PA · RI · SC · VT · VA · WA · WV · WI |
| 2020 | 1 | ID |
| 2018 | 8 | AK · DE · HI · IN · MN · NE · OK · TN |
| 2015 | 1 | MI |
| 2012 | 2 | MS · TX |
| 2009 | 1 | KY |
Local amendments
Climate-zone insulation tables, radon mitigation, storm-shelter and wildland-urban-interface additions are common local amendments.