St. Charles County building officers seek to identify and prevent all hazards related to the design, erection, repair, removal, demolition, or use and occupancy of buildings, structures, and premises in unincorporated areas.  This is accomplished through review of building construction plans, construction inspections, and enforcement of county building codes and regulations which set safety standards for all aspects of building construction including structural, fire, plumbing, electrical, and mechanical systems. 

St. Charles County is currently using 2009 International Residential Code; 2009 International Building Code; 2009 International Plumbing Code; 2009 International Mechanical Code; 2009 International Fire Code; and 2008 National Electric Code. These codes have been modified slightly by County Ordinance and can be found in the County’s Building & Construction Codes.

Building Division contact information: Building Division
201 N. Second St., Suite 412
St. Charles, MO 63301
636.949.7336 (fax)
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The Division of Development Review provides engineering review for all new development plans in unincorporated areas of St. Charles County to ensure that site improvements, including grading, erosion control, storm water facilities, and street design comply with the Unified Development Ordinance (UDO), design standards, and prudent engineering design practices.  The review process is designed to minimize the impact of new development on properties outside of the development area and to ensure that all publicly dedicated facilities meet the county’s standards for public maintenance.  Development Review ensures that the UDO, Design Criteria for the Preparation of Improvement Plans, tree preservation, streambank protection, and flood plain encroachment regulations are adhered to when reviewing a proposed development. 

The Division of Development Review administers the County's storm water program and general state operating permit as a Small Municipal Separate Storm Sewer System (MS4). This permit also serves as the county's federal National Pollutant Discharge Elimination System (NPDES) permit in compliance with the Federal Water Pollution Control Act (Clean Water Act).

The Division of Development Review also oversees the Neighborhood Improvement District (NID) Program.  The division assists property owners with public improvements within a defined area of the community, established as a NID. Improvements to streets, sewers, sidewalks, lighting, and a number of other community enhancements are accomplished through a cooperative effort between the county and residents within the NID area.  The division coordinates improvement efforts and provides engineering, and inspection support to the project.  Residents in NID neighborhoods may chose to pay for the improvement in one lump sum or through special assessments financed by county bonds over a period of 10 or 20 years.

Development Review Division contact information: Development Review Division
201 N. Second St., Suite 433
St. Charles, MO 63301
636.949.7529 (fax)
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Neighborhood Preservation Division (commonly referred to as "Code Enforcement" in other communities) handles complaints about the general condition of residential and commercial property and buildings. Tall grass and weeds, rubbish, unlicensed vehicles, commercial vehicles parked in residential neighborhoods, and peeling paint are just a few of the violations handled. A more detailed list of common violations can be seen by clicking here.

Every complaint filed with the division is investigated by an inspector to verify regulations adopted by the County Council are met.

To file a complaint, please complete the online form. You may also submit your complaint by mail or phone.

Neighborhood Preservation contact information: St. Charles County Government
Neighborhood Preservation

201 N. Second St., Suite 414
St. Charles, MO 63301
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Property Maintenance Code

The County adopted the 2009 International Property Maintenance Code (IPMC) with several changes as the minimum standard for which County properties need to be maintained. Copyright laws restrict the County from posting the entire 2009 International Property Maintenance Code (IPMC) on the website but copies are available at any of the County libraries. You can also purchase a copy of the IPMC directly from the International Code Council online. 

To view the County's Property Maintenance Code, see the St. Charles County Charter and Revised Ordinances.

The Division of Planning and Zoning coordinates review of land development proposals and develops plans within unincorporated areas to enhance responsible growth and ensure compliance with county regulations.  The division is responsible for processing all subdivision plats, site plans, flood plain development permit requests, rezoning applications, conditional use permits, and requests for variance from zoning regulations. The Division is also responsible for preparing the County Master Plan and other long-range and special area planning studies. Information on county demographics, specific zoning details, and future growth and development can be obtained from Planning and Zoning.

St. Charles County offers an interactive mapping system that contains vast information such as: how property is zoned, land use information, aerial photography, and much more.  You may access this interactive mapping system at; view, download, and print prepared maps or you may call the St. Charles County Information Systems Department at 636.949.7480 for more information.

Planning & Zoning Division contact information:

Planning & Zoning Division
201 N. Second St., Suite 420
St. Charles, MO 63301
636.949.7336 (fax)
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