In unincorporated McHenry County, maximum building coverage is roughly 30-35% in residential/estate districts and maximum impervious surface is generally 50% (Table 16.36-1). In SARA and Class III resource-area overlays, impervious coverage is capped at 50% regardless of the underlying district.
UDO Table 16.36-1 (§ 16.36.040) sets maximum building coverage and impervious surface by district. Residential and estate districts allow roughly 30% (R-2) to 35% (R-1, E-1) building coverage, with agricultural coverage scaling down as parcel size grows (30% up to 2 acres, 20% for 2-3 acres, 15% for 3-5 acres, 10% for 5+ acres). Maximum impervious surface is 50% in residential/estate/agricultural districts, higher (65-70%) in commercial and industrial districts. In the Special Resource Areas (SARA) and Class III overlays, § 16.52.040 limits impervious coverage to the lesser of the district maximum or fifty percent. Cities set their own coverage rules.
Exceeding building or impervious coverage limits is a zoning violation; the county can deny permits, require a variation, or mandate removal of excess coverage, and overlay-area breaches can trigger stormwater enforcement.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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Crystal Lake collects yard waste and food-scrap compost weekly at the curb from April 1 through November 30. Leaves and grass must go in biodegradable paper ...
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Crystal Lake and McHenry County have no ordinance specifically banning or approving residential artificial turf. Installations must still meet Unified Develo...
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Illinois' Homeowners' Native Landscaping Act bars community associations from banning native-species plantings that are kept free of weeds and don't encroach...
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Neither Crystal Lake nor McHenry County prohibits residential rain barrels or rainwater collection, and Illinois has no statewide ban. The McHenry County Sto...
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Crystal Lake uses a color-coded water-conservation system. During a declared 'Yellow' condition, odd-numbered addresses water on odd dates and even addresses...
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Crystal Lake Chapter 526 lists noxious weeds - burdock, ragweed, thistle, poison ivy, wild mustard and others - plus any unmanaged vegetation as nuisance gre...
See how McHenry County's lot coverage limits rules stack up against other locations.
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