County Building Permits
Carroll County, IL - 2026 Building Permit Guide
How to apply for a building permit in unincorporated Carroll County, Illinois. Permit authority, application steps, fees, and inspection requirements.
Permit Authority
Unincorporated Carroll County only; incorporated municipalities handle their own permits.
- Department
- Carroll County Zoning / Building Permit administration
- Address
- 301 N Main St, Mt Carroll, IL 61053
- Phone
- 815-244-0223
- Website
- https://www.carrollcountyil.gov/
Application Process
- Confirm zoning compliance with Carroll County zoning staff before starting work.
- Complete the county building permit application and attach required plans.
- Submit the application to the county office for review.
- Pay permit fees and any plan review fees.
- Permit is issued after review and approval.
Source: Carroll County Zoning / Building Permit administration
General Requirements
County instructions generally require permits before construction, alteration, addition, or placement of structures, subject to listed exemptions.
Required Documents
- Completed application
- Site plan
- Construction drawings or plans as required by staff
- Contractor information where applicable
- Building code
- The statewide minimum code set effective January 1, 2025.
- Contractor requirements
- Illinois has no statewide general contractor license; local registration rules may apply if adopted.
Work That Does NOT Require a Permit
Contact the Carroll County Zoning / Building Permit administration to confirm whether your project requires a permit before starting work.
Inspections
How to Schedule
Additional Resources
- Building code: The statewide minimum code set effective January 1, 2025.
- County permit instructions PDF
- 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 Carroll County Zoning / Building Permit administration before applying.
Frequently Asked Questions
Carroll County Building Permit FAQ
- Do I need a building permit in unincorporated Carroll County, IL?
- County instructions generally require permits before construction, alteration, addition, or placement of structures, subject to listed exemptions.
- How do I apply for a building permit in unincorporated Carroll County, IL?
- 1. Confirm zoning compliance with Carroll County zoning staff before starting work. 2. Complete the county building permit application and attach required plans. 3. Submit the application to the county office for review. 4. Pay permit fees and any plan review fees. 5. Permit is issued after review and approval.
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