Deck & Patio Permits: Chicago vs Des Plaines
How do deck & patio permits rules compare between Chicago, IL and Des Plaines, IL?
Chicago and Des Plaines have similar restriction levels.
Chicago, IL
Cook County
Chicago requires building permits for porches and decks that are 50 sq ft or larger OR more than 6 feet above grade. At-grade patios (concrete, pavers) may be exempt. The 10-day aldermanic notification period applies. All decks must comply with zoning setback requirements.
View full Chicago rules →Des Plaines, IL
Cook County
Decks attached to a home in Des Plaines require a building permit regardless of size. Patios at grade may be permit-exempt below a threshold but still must comply with zoning, lot coverage, and floodplain rules.
View full Des Plaines rules →Key Facts Comparison
| Fact | Chicago | Des Plaines |
|---|---|---|
| Permit Threshold | 50+ sq ft or 6+ ft above grade | - |
| At-Grade Patios | Generally exempt | - |
| Rooftop Decks | Special structural review needed | - |
| Aldermanic Notice | 10-day period (waivable) | - |
| Deck Permit | - | Required |
| Patio Permit | - | Often exempt under 200 sq ft |
| Footing Depth | - | 42 inch frost line |
| Guard Height | - | 36-42 inches |
| Floodplain | - | Additional rules apply |
Highlighted rows indicate differences between cities.
Chicago FAQ
Do I need a permit for a deck in Chicago?
Yes if the deck is 50 sq ft or larger or more than 6 feet above grade. At-grade patios (concrete, pavers) may be exempt. The 10-day aldermanic notification period also applies.
Can I build a rooftop deck in Chicago?
Rooftop decks require special structural review and may need zoning relief depending on the building and district. A building permit is required, and structural engineering plans prepared by a licensed professional are typically necessary.
Des Plaines FAQ
Do I need a permit for my Des Plaines deck?
Yes. Attached decks require a building permit regardless of size. Submit plot plan and construction details to Community Development.
What about a paver patio?
At-grade patios under a threshold (commonly 200 sq ft) may be permit-exempt but still count toward lot coverage limits. Verify with Community Development.
What if my deck is in the Des Plaines River floodplain?
Additional floodplain elevation and permit requirements apply. Contact the city's floodplain administrator before designing or applying.
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