Building Permits in Illinois
We cover 42 cities in Illinois. Select a city below to see local permit requirements.
Building Codes in Illinois
Building permit requirements in Illinois are enforced at the local level — each city and county building department sets its own rules, fees, and timelines. Most cities in Illinois follow the 2021 IRC, though 13 cities are still on the 2018 edition.
We cover 42 cities in Illinois with 4,379 specific permit rules. That's real, locally researched data — not generic advice. Each city page shows exactly what triggers a permit, what's exempt, estimated fees, and how to apply.
The bottom line: don't assume your city follows the same rules as the one next door. A fence that's exempt in one town might need a full permit two miles away. Always check your specific city.
Common Permit Exemptions in Illinois
These are the most common projects that don't require a permit across cities in Illinois. Keep in mind — "exempt from a permit" doesn't mean "exempt from code." You still have to build to code even without a permit.
Window / Door: Exempt in 77 of our 42 covered cities
Fence / Gate: Exempt in 47 of our 42 covered cities
Tree Removal: Exempt in 42 of our 42 covered cities
Siding: Exempt in 42 of our 42 covered cities
Shed / Outbuilding: Exempt in 42 of our 42 covered cities
Exemptions vary by city. Always verify with your local building department before starting work.
Contractor Licensing in Illinois
If you're hiring a contractor in Illinois, make sure they're properly licensed. You can verify credentials through the Illinois DFPR.
Two rules of thumb: never pay a contractor in full upfront — a third down is standard. And if a contractor tells you "we don't need a permit for this," that's a red flag. Use PermitMint to verify before you sign anything.
Popular Project Guides
Common home improvement projects in Illinois:
Cities in Illinois
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