Cass County, MO Accessory Structures: Shed & Carport Rules (2026)
Shed permit rules in Cass 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.
Key Facts
- Building-permit exemption
- Sheds under 400 sq ft
- Zoning permit
- Still required regardless of size
- Accessory sidewall height cap
- 14 ft (16 ft with engineered plans)
- Setback from principal structure
- 10 feet minimum
- Structures over 1,000 sq ft
- Require existing principal residence
Summary
In unincorporated Cass County, a one-story detached shed, tool building or similar accessory structure under 400 square feet does not need a Building Codes Department permit, though it still must satisfy the Zoning Department's setback and zoning permit rules under Section 500.010(B)(5).
One-story detached accessory structures used as tool and storage sheds, playhouses and similar uses, provided the floor area does not exceed four hundred (400) square feet (37.1 m2). FPN: This exception from a building permit from the Building Codes Department does not preclude the requirement for a building permit to be obtained from the Cass County, Missouri Zoning Department or meeting the Cass County, Missouri Zoning Ordinance rules and regulations.
Full Breakdown
010(B), revises the adopted International Building Code's list of work exempt from a building permit. ' So a shed under 400 square feet skips the Building Codes Department review, but it still needs whatever the Zoning Department requires. The Zoning Order layers its own size and placement rules on top. as defined in the district requirements'; district standards across the Agricultural, R-R, R-S and platted residential districts cap accessory building sidewall height at fourteen feet, or sixteen feet with sealed engineered drawings. ' Structures over 1,000 square feet on parcels over five acres in the Rural Residential and Rural Suburban Districts require a principal residence already in place on the property.
Violations & Fines
Building a shed or accessory structure without the required Zoning Department permit, or exceeding the district's accessory-building height or spacing standards, is a Zoning Order violation even if the structure is small enough to skip Building Codes Department review. The Zoning Enforcement Officer issues notice, the owner has ten days to correct the violation, and an uncorrected case goes to Circuit Court with fines up to $1,000 per day under Section 400.030(A)(22)(e).
Frequently Asked Questions
Do I need a permit for a small shed in unincorporated Cass County?
How close to my house can I put a detached shed?
How tall can a shed's sidewalls be?
Sources & Official References
Other rules in Cass County
How Cass County compares: Shed Permit Requirements by City·Compare Cass County to another location·View the Missouri accessory structures overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.