Accessory Structures in Florissant, MO (2026)
2 verified accessory structures rules for Florissant, Missouri, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Missouri has no statewide ADU mandate. Florissant's Zoning Code (Chapter 405) does not authorize accessory dwelling units in single-family R-1 through R-4 districts. Section 405.085 limits R-1 to single-family dwellings plus customary accessory buildings. A duplex requires R-5 zoning.
ADU Rules in Florissant
Heavy RestrictionsShed Rules
Florissant treats sheds and storage buildings as accessory structures under the Zoning Code (Chapter 405) supplementary district regulations and the Building Code (Chapter 500). The published Public Works guideline caps shed height at 18 feet, and not exceeding the height of the residence; structures within 6 feet of the house must match the house setback, and any shed of 200 square feet or more requires construction plans submitted with the building permit application.
Shed Rules in Florissant
Some RestrictionsLooking for St. Louis County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Florissant city rules.
Accessory Structures in St. Louis County →