Ordinances, Codes & Regulations

Building Codes

Online searchable database. By clicking this link, you will be redirected from the City of O'Fallon website.
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.