Concrete Slab Permit Requirements in Union, IL
Village of Union handles its own building permits (McHenry County only covers unincorporated areas, not incorporated villages). Building Inspector is available one hour per week, Tuesdays 3 PM to 4 PM. The village has not published its adopted residential code edition online; rules below use IRC 2021 as baseline (the most common adoption in the Chicago metro). No published fee schedule, no online application portal. Apply in person during Village Hall hours or email permits@unionillinois.org. Illinois state plumbing code (IDPH-licensed plumbers) and electrical licensing requirements apply regardless of local code adoption.
By Joey, Founder · Last verified April 18, 2026 · How we research →
When you don’t need a Concrete Slab permit in Union
A small concrete slab on grade (under 200 square feet, no structure on top) generally does not require a building permit in Union, IL under 2021 IRC R105.2 (sidewalks and similar). Verify with the Village Building Inspector at (815) 923-4153 (available Tuesdays 3 PM to 4 PM) before starting work.
When you need a Concrete Slab permit in Union
Larger concrete slabs (over 200 square feet) or any slab intended as a foundation for a future structure require a building permit in Union, IL under 2021 IRC R403. Verify with the Village Building Inspector at (815) 923-4153 (available Tuesdays 3 PM to 4 PM) before starting work.
Concrete Slab Permit Costs: Union vs. Nearby
| City | Estimated Fee |
|---|---|
| Union | N/A |
| Chicago | $75 – $600 |
| Aurora | $75 – $600 |
| Joliet | $75 – $600 |
Fees shown are estimates based on local building code data. Actual fees may vary based on project scope and valuation. See all Union permit costs →
Zoning Considerations
Concrete slabs contribute to impervious surface coverage. Austin, Portland, Seattle, and many coastal cities cap impervious cover at 40-65% of lot area. Sidewalks and curb cuts in the public right-of-way always require a separate Public Works encroachment permit.
Estimated Project Timeline in Union
Here's a typical timeline for a concrete slab project in Union, IL:
Timeline is based on Union's typical about 2 weeks permit processing time. Actual timelines vary by project complexity, completeness of application, and current department workload.
Need a Concrete Slab permit in Union, IL?
Answer a few quick questions for a personalized answer about your specific project.
Check Now, Free →Building Department Contact
Frequently Asked Questions
Contact Union's building department for current Concrete Slab permit fee information. Fees typically vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller Concrete Slab projects may be exempt from permit requirements, while larger ones typically require a permit. Use our free lookup tool to check your specific situation.
Working without a required permit in Union can result in fines, stop-work orders, being required to remove completed work, and complications when selling your home. It's always best to check first.
Typical approval time for Concrete Slab permits in Union is about 2 weeks. More complex projects may take longer if plan review is required.
Learn More About Concrete Slab Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read Concrete Slab Guide →