Lake County UDO limits residential lot coverage to 30-40% in R-1/R-2 districts. Municipalities like Highland Park and Lake Forest apply stricter impervious coverage ratios, and the Lake County Watershed Development Ordinance (WDO) triggers stormwater review at 15%+ impervious area.
Under Lake County UDO Section 8.5, maximum lot coverage in R-1 is 25%, R-2 is 30%, and R-3 is 35% (buildings only). Total impervious surface coverage (buildings plus driveways, patios, walkways) typically may not exceed 40-50% depending on district. Municipal limits: Highland Park Code caps impervious at 40% in R-6; Lake Forest limits building coverage to 20-25% in R-3/R-4 with additional floor-area ratio (FAR) controls; Waukegan R-5 allows up to 40% building coverage; Gurnee limits R-1 building coverage to 30%; Libertyville R-5 caps at 35%. Critically, the Lake County Watershed Development Ordinance (WDO) administered by the Lake County Stormwater Management Commission requires a watershed development permit whenever a project creates or modifies 15,000+ sq ft of impervious area or disturbs 5,000+ sq ft. Permeable pavers may receive 50% credit under WDO if designed per standards. Given Fox River and Des Plaines River flooding risks, compliance is strictly enforced.
Exceeding lot coverage: permit denial or stop-work order. Unauthorized impervious additions: removal required; fines $250-$2,500 under UDO Art. 14. WDO violations: stop-work order, $500-$10,000 fines, and mandatory stormwater retrofits.
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See how Highland Park's lot coverage limits rules stack up against other locations.
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