Generator 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 Generator permit in Union
A portable generator used with extension cords does not require a permit in Union, IL. If a transfer switch or interlock is installed, the work becomes permitted electrical work. Verify with the Village Building Inspector at (815) 923-4153 (available Tuesdays 3 PM to 4 PM) before starting work.
When you need a Generator permit in Union
A permanent standby generator (Generac, Kohler, etc.) requires electrical and mechanical permits in Union, IL under 2021 NEC Article 702 and IRC M1305 for the gas connection. Verify with the Village Building Inspector at (815) 923-4153 (available Tuesdays 3 PM to 4 PM) before starting work.
Generator Permit Costs: Union vs. Nearby
| City | Estimated Fee |
|---|---|
| Union | N/A |
| Chicago | $75 – $1,500 |
| Aurora | $75 – $1,500 |
| Joliet | $75 – $1,500 |
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
Standby generators are subject to setback requirements, typically 5 feet from any building opening (NFPA 37) and 3+ feet from property lines. Some jurisdictions require site plan review showing generator placement. Noise ordinances (typically 55-65 dBA daytime, 45-55 dBA nighttime) may affect placement.
Estimated Project Timeline in Union
Here's a typical timeline for a generator 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.
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Frequently Asked Questions
Contact Union's building department for current Generator permit fee information. Fees typically vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller Generator 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 Generator permits in Union is about 2 weeks. More complex projects may take longer if plan review is required.
Learn More About Generator Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read Generator Guide →