3 rules for unincorporated St. Clair County, Illinois.
Verified from official government sources
In the SR-1 single-family district, unincorporated St. Clair County requires a 25-foot front yard, 25-foot side yard abutting a street, a total 30-foot side yard (15-foot minimum either side), and a 25-foot rear yard. Other zoning districts set their own dimensions in the Area/Bulk Schedule.
St. Clair County Zoning Ordinance Sec. 40-3-7 (SR-1)
SR-1... DEPTH OF FRONT YARD 25'; DEPTH OF SIDE YARD ABUTTING A STREET 25'; DEPTH OF SIDE YARD ABUTTING A LOT 30 [total] FOR BOTH / 15 [minimum] EITHER; DEPTH OF REAR YARD 25'.
In residential districts of unincorporated St. Clair County, the maximum principal building height is 35 feet. Detached accessory buildings such as garages and sheds are capped at 25 feet. Buildings used for governmental purposes may reach 100 feet.
St. Clair County Zoning Ordinance Sec. 40-3-7, Note 4
The maximum of height of the principal building, excluding buildings and structures used for governmental purposes, shall be 35 ft. Buildings and structures used for governmental purposes shall have a maximum of no more than 100 ft.
St. Clair County caps how much of a lot buildings may cover. In the SR-1 and SR-2 single-family districts the maximum coverage is 20% of the lot; the smaller SR-3 and mobile-home districts allow up to 30%. Coverage counts principal and accessory buildings.
St. Clair County Zoning Ordinance Sec. 40-3-7 (Max. Coverage column K)
SR-1... MAXIMUM COVERAGE IN % OF LOT 20%. SR-2... 20%. SR-3... 30%. SR-MH... 30%.
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