Administrative overview · FIPS 17163
St. Clair County permit authority
The first compliance decision is jurisdictional: identify the office with statutory authority over your parcel, then use its filing and inspection sequence to keep the project moving.
Jurisdictional status
County
This county profile is the primary starting point for unincorporated-area permitting.
Responsible agency
St. Clair County Building & Zoning Department
For a project in or near St. Clair County, this office is the identified point of contact for permit intake, statutory code enforcement, plan review coordination, and inspection release conditions. Confirm the parcel’s boundary and project type before relying on the county lane.
Direct contact
618-277-6600 Ext. 2531; inspections 618-277-6600 Ext. 2644
Call before mobilizing if the project has a boundary, occupancy, fire, septic, or utility question.
Permit counter
St. Clair County Building, 10 Public Square, 5th Floor, Belleville, IL 62220
Operating hours
Monday-Friday 8:30 AM-4:30 PM; department information also lists service hours through 5:00 PM.
Review expectation
Ask the agency for its current review estimate
Compliance workbench
Choose the next project decision.
Apply online
Open the verified digital gateway, application form, and review timeline.
Open guide →Fees & penalties
Understand fee schedules, enforcement exposure, and stop-work liabilities.
Open guide →Codes & exemptions
Read the code framework, minor-work exemptions, and inspection lane.
Open guide →Agency website
Visit the primary public source for current notices and contact changes.
Open guide →Source trail
Official sources for this profile
Use these direct agency or licensing links to confirm current instructions before you file, pay, or schedule work. External pages control if their information differs from this directory.
Project questions
Frequently asked questions for St. Clair County
Who handles permitting for this jurisdiction?
St. Clair County Building & Zoning Department is the identified county-level authority for this profile. Confirm that the property is in its service area before filing.
How should I begin an application?
No verified online portal was located in the reviewed public materials. Contact 618-277-6600 Ext. 2531; inspections 618-277-6600 Ext. 2644 and request the current application route before preparing a final submittal.
How long might review take?
A typical review timeline was not verified. Ask the agency for its current completeness and review estimate.
How are inspections scheduled?
Call 618-277-6600 Ext. 2644 at least 24 hours before the inspection with the permit number, address, and owner's name. A failed inspection requires a $75 reinspection fee.
Which codes and exemptions should I review?
The currently posted county code list identifies the 2012 International Building, Residential, Mechanical, and Fuel Gas Codes; 2018 Illinois Energy Conservation Code; 2011 NEC; 2012 International Swimming Pool and Spa Code; 2013 NFPA 72; 1997 Illinois Accessibility Code; and current Illinois Plumbing Code. Ordinary repairs generally do not require a permit, but structural, egress, plumbing, electrical, mechanical, or public-health-and-safety work does. Agricultural-use structures, public-school structures, and township structures are listed as exempt from specified county fees; detached accessory buildings have additional plan and affidavit requirements from March 1, 2025.