Ordinances, Codes & Regulations

Building Codes

 
 
Online searchable database. By clicking this link, you will be redirected from the City of O'Fallon website.
As of January 1, 2021, the following building codes are in effect (as modified per Ord #4163)
2018 International Residential Code
2018 International Building Code
2018 International Fire Code
2018 International Existing Building Code
2017 National Electric Code and additional regulations and standards
2018 International Mechanical Code
2018 International Fuel Gas Code
2018 International Energy Conservation Code (with State of Illinois revisions)
2018 International Property Maintenance Code
2018 International Swimming Pool and Spa Code
Illinois Plumbing Code

Illinois Accessibility Code (enforced as required through Illinois State Statute)

Most of the codes can be viewed online using the hyperlinks above. Paper copies of the ICC Codes are available at the City Clerk's office and the O'Fallon Public Library.
This is a user-friendly printable list of the Codes adopted by the City of O'Fallon, which includes the additional regulations and standards adopted for the 2011 NEC.
Addresses development concerns in floodplain areas.
You may purchase any page of the International Codes through this ICC website.