Shed permit rules in St. Louis County, MO — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
A building permit is required for sheds larger than 120 sq ft in unincorporated St. Louis County and in cities that contract for building inspection. Sheds ≤120 sq ft are permit-exempt but must comply with setbacks and the Property Maintenance Code.
Under SLCRO §1115.105.2 (Work Exempt from Permit), sheds 120 sq ft and smaller skip the permit process. Larger sheds require site plan (4 copies), construction plans (4 copies), and engineered truss plans. Setbacks come from the underlying zoning district — typically 5 ft side/rear in R-1 through R-6 districts. After 14 days, a PODS portable container is treated as a shed and falls under these rules.
Stop-work; double permit fees; up to $1,000 fine; removal of structure if non-conforming.
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