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.
The Area/Bulk Schedule (Sec. 40-3-7) sets maximum coverage as a percentage of the zoning lot. SR-1 (20,000-sq-ft) and SR-2 (15,000-sq-ft) single-family districts cap coverage at 20%, while SR-3 (10,000-sq-ft) and the SR-MH district permit up to 30%. 'Lot coverage' is the area occupied by the principal building(s) and accessory buildings (Sec. 40-2-2 definitions). These limits apply in the unincorporated county; municipalities set their own coverage standards.
Exceeding maximum lot coverage 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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