Adopted edition
Local adoption (no statewide residential code)
Local amendments override state floor.
IL · County
Cook County, IL.
Chicagoland. CRITICAL: City of Chicago uses separate Chicago Building Code (NOT IRC/IBC). Suburban Cook municipalities typically adopt IRC with Most populous Chicago DOB administers permits within
Design wind speed
90 mph
ASCE 7 Risk Cat II, 3-second gust at 33 ft. Drives fastener spacing, hold-downs, and opening protection.
Climate zone (IECC)
5A
Drives R-value, fenestration U-factor, and air-leakage envelope rules.
Special zones
- HVHZ
- WBDR
- WUI
- FEMA SFHA possible
Permit office
Cook County County Building Department
Local conditions
- Ground snow load: 25-30 psf
- Frost depth: 42-48".
Common amendments + overlays
What's specific to this county.
- §01 County has local amendments to the state floor — consult the building department.
Working in Cook County?
Pull an address-level code packet for any property in Cook County. SkyCanvass resolves the parcel, looks up the adopted edition + the Cook County-specific amendments listed above, and emits a cited packet ready for permit submittal.
See the Illinois state overview for the broader context, or browse the state directory.
Pull a Cook County code packet.
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