Accessory Structures in St. Charles County, MO (2026)
1 rule for unincorporated St. Charles County, Missouri.
Verified from official government sources
Note: These county rules apply to unincorporated areas of St. Charles County. If you live within an incorporated city, that city's own rules apply: see the city list below.
Shed & Carport Rules
St. Charles County caps total accessory-structure square footage by lot size, starting at 1,200 square feet on parcels under an acre, and requires a 50-foot front setback plus 7-foot side and rear yards for sheds and other outbuildings.
St. Charles County Shed Size and Setback Rules
Some RestrictionsSt. Charles County UDO Section 405.090(E)
1. Maximum total size of all accessory structures (except stables) on any given parcel may not exceed the following limits. a. For parcels less than one (1) acre in size, up to one thousand two hundred (1,200) square feet. ... 3. Minimum front yard of accessory structure. Fifty (50) feet. 4. Minimum side yard of accessory structure. Seven (7) feet, except on lots of three (3) acres, or greater,...
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