O'Fallon, IL
How permitting works in Illinois
Cities in Illinois wield significant power through "Home Rule." The city's role is to create and manage its own permitting ecosystem, which often includes unique local requirements for fire suppression or historical preservation that go beyond any state-level recommendations.
Strong Home Rule; no mandatory state residential code.
We don't have a permit office on record for O'Fallon, IL.
Permitting authority
Building permits for this area are typically issued by St. Clair County, IL. Confirm the exact authority for your project address below.
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