County Building Permits
Warren County, IL - 2026 Building Permit Guide
How to apply for a building permit in unincorporated Warren County, Illinois. Permit authority, application steps, fees, and inspection requirements.
Permit Authority
Countywide zoning and building permit review for county areas; no separate county building department is published.
- Department
- Address
- Warren County Courthouse, 100 West Broadway, Monmouth, IL 61462
- Phone
- 309-760-4046
Application Process
General Requirements
Fees
- Minimum permit fee
- $25.00
Fees change. Verify current amounts at the official fee schedule.
Work That Does NOT Require a Permit
- Agricultural structures on parcels of 5 acres or more do not require a building permit, but still need a zoning certificate after inspection.
- Agricultural permits are issued free of charge where required.
- Small wind energy systems used for agricultural purposes are exempt from zoning and building fees.
Inspections
How to Schedule
- Contact the Zoning Office directly. (contact)
- Inspection hours
- 9 am to Noon, Monday, Wednesday, Friday.
Additional Resources
- Zoning code
- Zoning application info sheet
- County communities list
- 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
Warren County Building Permit FAQ
- How much does a building permit cost in unincorporated Warren County, IL?
- The minimum permit fee is $25.00.
- What work is exempt from building permits in unincorporated Warren County, IL?
- The following work is generally exempt: Agricultural structures on parcels of 5 acres or more do not require a building permit, but still need a zoning certificate after inspection.; Agricultural permits are issued free of charge where required.; Small wind energy systems used for agricultural purposes are exempt from zoning and building fees..
- How do I schedule a building inspection in unincorporated Warren County, IL?
- Inspections can be scheduled via: Contact the Zoning Office directly..
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