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.
Setbacks are fixed by the Schedule of Minimum Area, Bulk and Yard Requirements (Sec. 40-3-7). For the SR-1 district (20,000-sq-ft lots): front yard 25 ft; side yard abutting a street 25 ft; side yards totaling 30 ft with a 15-ft minimum on either side; rear yard 25 ft. Detached accessory buildings must sit at least 5 ft from side and rear lot lines. Smaller SR-2 and SR-3 districts reduce total side-yard minimums to 25 ft and 15 ft. These standards apply only in the unincorporated county.
Building inside a required setback without a variance is a Class B misdemeanor, fined $50 to $500 plus costs (Sec. 40-11-10); relief requires an Area/Bulk Variance from the Zoning Board of Appeals.
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See how St. Clair County's setback rules rules stack up against other locations.
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