County Building Permits
Clay County, IL - 2026 Building Permit Guide
How to apply for a building permit in unincorporated Clay County, Illinois. Permit authority, application steps, fees, and inspection requirements.
Permit Authority
Unincorporated Clay County only, if the county requires zoning, setback, driveway, sewage, or other county review.
- Department
- Address
- Clay County Engineer, 14464 Highway 45 South, Louisville, IL 62858
- Phone
- (618) 665-3346
- Website
- https://claycountyillinois.org/
Application Process
- Confirm whether the parcel is inside a municipality or in unincorporated county territory.
- If the project affects access, address assignment, drainage, or septic, coordinate with the relevant county office first.
- Submit any county forms the staff directs you to use.
- Wait for county approval before starting work.
General Requirements
- Building code
- No county building code page was found. State minimum code requirements still apply as of January 1, 2025.
- Contractor requirements
- No county general contractor license was found. State licensed plumbing and electrical trades still apply.
Work That Does NOT Require a Permit
Contact the to confirm whether your project requires a permit before starting work.
Inspections
How to Schedule
Additional Resources
- Building code: No county building code page was found. State minimum code requirements still apply as of January 1, 2025.
- Clay County maps
- License lookup guide: Illinois Contractor License Requirements
- Contract template: Illinois Homeowner-Contractor Agreement
- Illinois hub: Illinois Contractor License & Permit Hub
Information on this page was last verified: March 2026. Permit rules and fees change — confirm current requirements directly with the before applying.
Frequently Asked Questions
Clay County Building Permit FAQ
- How do I apply for a building permit in unincorporated Clay County, IL?
- 1. Confirm whether the parcel is inside a municipality or in unincorporated county territory. 2. If the project affects access, address assignment, drainage, or septic, coordinate with the relevant county office first. 3. Submit any county forms the staff directs you to use. 4. Wait for county approval before starting work.
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