County Building Permits
Knox County, IL - 2026 Building Permit Guide
How to apply for a building permit in unincorporated Knox County, Illinois. Permit authority, application steps, fees, and inspection requirements.
Permit Authority
unincorporated areas of Knox County
- Department
- Knox County Zoning Department
- Address
- Knox County Annex, Suite 1, 121 South Prairie Street, Galesburg, IL 61401
- Phone
- 309-345-3840
Application Process
Source: Knox County Zoning Department
General Requirements
Required Documents
- county page says all documentation is required, and the application materials call for a site map and construction plan with materials used.
- Owner-builder
- all applications must be signed by the landowner unless there is a lease agreement.
Fees
- Minimum permit fee
- $25 non-refundable application fee
- Plan check fee
- not separately published
Fees change. Verify current amounts at the official fee schedule.
Work That Does NOT Require a Permit
Contact the Knox County Zoning Department to confirm whether your project requires a permit before starting work.
Inspections
How to Schedule
- permit holder schedules inspections (contact)
started-before-permit work is doubled
Additional Resources
- Zoning information: View zoning info
- Zoning permits URL
- Zoning documents URL
- 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 Knox County Zoning Department before applying.
Frequently Asked Questions
Knox County Building Permit FAQ
- How much does a building permit cost in unincorporated Knox County, IL?
- The minimum permit fee is $25 non-refundable application fee. Plan check fee: not separately published.
- How do I schedule a building inspection in unincorporated Knox County, IL?
- Inspections can be scheduled via: permit holder schedules inspections.
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