County Building Permits
Montgomery County, IL - 2026 Building Permit Guide
How to apply for a building permit in unincorporated Montgomery County, Illinois. Permit authority, application steps, fees, and inspection requirements.
Permit Authority
countywide structural improvement notification only, not a county building permit program
- Department
- Montgomery County Supervisor of Assessments
- Address
- 1 Courthouse Square, Room 201, Hillsboro, IL 62049
- Phone
- 217-532-9595
Application Process
General Requirements
no county building permit; structural improvement notification for assessment purposes when work is $1,000 or more.
Required Documents
- owner name and address, improvement information, estimated start date, cost estimate, property number, legal description.
Fees
- Permit fee formula
- none for a county permit; this is not a fee-based permit
Work That Does NOT Require a Permit
Contact the Montgomery County Supervisor of Assessments to confirm whether your project requires a permit before starting work.
Inspections
How to Schedule
Additional Resources
- Supervisor of Assessments FAQ
- Structural improvement worksheet instructions
- GIS
- 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 Montgomery County Supervisor of Assessments before applying.
Frequently Asked Questions
Montgomery County Building Permit FAQ
- Do I need a building permit in unincorporated Montgomery County, IL?
- no county building permit; structural improvement notification for assessment purposes when work is $1,000 or more.
- How much does a building permit cost in unincorporated Montgomery County, IL?
- Fees are calculated as: none for a county permit; this is not a fee-based permit.
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