How Do I Apply?
Please visit the Land Development & Zoning Applications section of our Citizenserve Citizen Access Portal.
When is a Site Plan Required?
The site plan approval process supports orderly development in the unincorporated County through compliance with zoning standards like setbacks, parking and loading, floodplain regulations, screening, landscaping, and outdoor lighting; site development standards like storm water drainage, water quality, and erosion control; and access standards for driveways.
Developers or property owners must obtain Site Plan approval from St. Charles County to:
- Construct or build an addition to an institutional, commercial, or industrial structure within unincorporated St. Charles County
- Convert an existing structure to an institutional, commercial, or industrial structure within unincorporated St. Charles County
- Change the use of a site, when the Planning and Zoning Division Director requires such approval
Site plans must be prepared by an engineer or architect licensed by the State of Missouri, unless waived by the Director of Community Development. Site plans must at a minimum include the information specified in Section 405.525 of the Unified Development Ordinance. If the project disturbs an area of 5,000 square feet or greater, you will also need to apply for a Major Land Disturbance Permit.
Additional support for citizens or businesses interested in developing property for a commercial, industrial or institutional project in the unincorporated areas of St. Charles County can be found under the County's One Stop Development Assistance Program and Guide to Opening a Business in unincorporated County webpages.
Complete applications must include payment of the fee specified in Section 425.020.G of the Unified Development Ordinance.