Lake County limits site coverage through an Impervious Surface Ratio (ISR) set per zoning district in LDR Table 3.02.06. The ISR caps the share of the site covered by roofs, roads, sidewalks, and paving, and applies to both residential and nonresidential development.
Rather than a simple building-footprint rule, the LDR uses an Impervious Surface Ratio (3.02.04): a measure of how much of the base site area is covered by material that prevents stormwater infiltration — roofs, roads, sidewalks, and parking lots of asphalt, concrete, compacted sand, limerock, or clay. Table 3.02.06 sets the maximum ISR for each zoning district and applies to residential and nonresidential development alike. Accessory structures add their own size cap: on lots under one acre, an accessory structure may not exceed 80 percent of the dwelling's enclosed living area. Density and floor-area ratios (nonresidential) are also in Table 3.02.06.
Exceeding the district Impervious Surface Ratio or the accessory-structure size cap is a permitting violation; Lake County may deny permits, require stormwater mitigation or a variance, and pursue code enforcement.
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