St. Charles County, MO Parking Rules: Driveway Rules (2026)

Under the Unified Development Ordinance, all parking areas, including driveways and aisles, must be paved and striped with Portland concrete, an asphaltic overlay, or a permeable pavement alternative; the Director of Planning and Zoning may approve an alternative dust-free surface at least six inches deep if it's kept free of weeds. A specific carve-out applies in the A (Agricultural) and R (Residential) Districts: if a use needs two or fewer parking spaces and sits on a lot of one acre or more, the driveway and parking area only need to be an all-weather surface at least six inches deep, kept clear of weeds and vegetation. Bare dirt or grass parking doesn't qualify either way.