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Codes and ordinances
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Building and Construction Codes
View St. Charles County's adopted International Building Codes with amendments.
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Floodplain Development
Learn more about the plan for floodplain management in the county.
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Miscellaneous Ordinances
These are additional regulations contained in the Ordinances of St. Charles County (OSCCMo), which the Community Development Department oversees.
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Property Maintenance Code
St. Charles County adopted and currently enforces the 2009 International Property Maintenance Code (IPMC) with amendments.
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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.
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Stormwater Management & Watercourse Protection
Learn more about St. Charles County's processes to handle storm water and keep our waterways safe.