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§ 02
When a permit is required
Permit triggers and exempt work for Knox County
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.
§ 03
Fee schedule
Knox County building permit fees
Fee type
Amount
01
Minimum permit fee
$25 non-refundable application fee
02
Plan check fee
not separately published
Fees change periodically. Confirm at the official fee schedule ↗ before budgeting.
§ 04
Required inspections
Scheduling and sequence
How to schedule
- permit holder schedules inspections (contact)
started-before-permit work is doubled
§ 05
Frequently asked
Common questions about unincorporated Knox County permits
01 How much does a building permit cost in unincorporated Knox County, IL? ▸
Building permit fees in unincorporated Knox County, IL are set by the local building department and vary by project type and valuation. The minimum permit fee is $25 non-refundable application fee. Plan check fee: not separately published.
02 How do I schedule a building inspection in unincorporated Knox County, IL? ▸
Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in unincorporated Knox County, IL via: permit holder schedules inspections.
last verified April 2026
source Knox County Zoning Department ↗
entry id permits/illinois/knox/unincorporated
Educational reference. Permit rules and fees change — confirm current requirements directly with Knox County Zoning Department before applying. Jaspector is not legal advice.