Codes and ordinances

Building and Construction Codes

View St. Charles County's adopted International Building Codes with amendments.

Floodplain Development

Learn more about the plan for floodplain management in the county.

Miscellaneous Ordinances

These are additional regulations contained in the Ordinances of St. Charles County (OSCCMo), which the Community Development Department oversees.

Property Maintenance Code

St. Charles County adopted and currently enforces the 2009 International Property Maintenance Code (IPMC) with amendments.

Unified Development Ordinance

In 1999, St. Charles County adopted the Unified Development Ordinance (UDO), which developed from the land subdivision regulations that had been in place since 1959.

Stormwater Management & Watercourse Protection