How to Get a Building Permit in Illinois?
Illinois building permits are issued locally under city-adopted codes (the 2021's — the 51's; the Chicago's). Chicago, Aurora, Joliet, Naperville, and Rockford have the programs. Illinois' differentiators: the -10°F (the 95°F — the delta's), the 25 psf (the 50's — the snow's), and the 115 mph (the basic's — the wind's).
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The local codes
Chicago, Aurora, Joliet, Naperville, Rockford, Springfield, Elgin, Peoria: the departments (typically 4-8 weeks — the Chicago's — the 6's). The 2021 (the 51's — the Chicago's; the adopted's). Illinois-licensed PE/architect stamps per the code's thresholds.
Heat, snow, and wind
The -10°F (the 95's — the delta; the 105's — the materials'), the 25 psf (the 50's — the snow's; the -10's), the 50 psf (the 25's — the snow's; the north's), the 2021 (the 51's — the Chicago's; the 4-8's), and the 115 mph (the wind's — the basic's).
Process notes
Chicago's (the 6-week's — the 4-8's; the professional), Aurora's (the 6-week's — the 4-8's), the 2021 (the 51's — the Chicago's; the 4-8 weeks), the -10°F (the 95's — the 105's; the delta's), and the 50 psf (the 25's — the snow's; the north's). The -10°F's — the 95's delta; the Chicago's — the energy code.
The bottom line
Illinois permits are local under city-adopted codes (4-8 weeks in Chicago). Design for -10°F cold, 25-50 psf snow, and 115 mph wind — plus Chicago energy code.
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