Do I Need a Permit to Build a Shed in Missouri?

No Statewide Code, No Uniform Rules

Missouri is one of a handful of states with no mandatory statewide residential building code. While the state Department of Public Safety sets codes for modular construction and uses the 2021 International Code Council series as a professional conduct baseline, residential construction — including sheds and accessory structures — is regulated entirely by local jurisdictions.

This means shed permit rules in Missouri change from city to city and county to county. Kansas City exempts sheds under 200 square feet. Springfield requires a permit for anything over 100 square feet. St. Louis County draws the line at 120 square feet, but with over 90 municipalities within the county, each one can add its own amendments. The result is a patchwork that requires checking with the specific jurisdiction where your property is located.

Most larger Missouri cities have adopted some version of the International Building Code (IBC) or International Residential Code (IRC), which sets the standard shed permit exemption at 120 square feet for one-story detached accessory structures. But whether your city follows this standard, uses a higher threshold, or uses a lower one depends on local ordinances. For a broader look at how shed permits work nationally, see our national guide to shed permits.

Common Patterns Across Missouri Cities

Despite the lack of a statewide code, some consistent patterns emerge across Missouri municipalities:

• The most common permit thresholds are 100, 120, or 200 square feet depending on the city
• Most cities require sheds to be in the rear yard only — front yard placement is almost universally prohibited
• Setbacks of 3–5 feet from side and rear property lines are standard
• Maximum height of 15 feet is common, though some cities cap at 12 feet
• Zoning compliance is required even for sheds that don't need a building permit
• Adding electrical or plumbing always requires a separate trade permit
• Pre-built and site-built sheds face the same rules — the permit threshold is based on size and features, not construction method

Many Missouri cities also limit the number of accessory structures per lot and cap the total combined area of all accessory structures as a percentage of the primary building's footprint or the lot's rear yard area.

How Five Major Missouri Cities Handle Shed Permits

Kansas City: 200 Square Feet With a BZA Twist

Kansas City is the most permissive major city in Missouri for small sheds. The city exempts one-story detached accessory buildings from a building permit when the projected roof area does not exceed 200 square feet. This exemption covers tool and storage sheds, playhouses, garages, carports, and similar uses.

The exemption comes from Kansas City's building permit exempt work list, which mirrors the IRC standard for 200 square foot structures. Even exempt sheds must still comply with all zoning and development code requirements, including setbacks and height limits.

Here's the catch: for sheds over 200 square feet, Kansas City requires not only a building permit but also a Board of Zoning Adjustment (BZA) variance. This is unusual among major cities. The BZA variance adds a review step that involves plan submittal per Information Bulletin IB100. This makes larger sheds in Kansas City more complicated to permit than in most other Missouri cities.

Kansas City's permit fees are valuation-based and calculated using the city's fee estimation calculator. For a typical shed, expect fees of $75 to $300+ depending on size. The Permits Division is located on the 5th floor of City Hall and can be reached at (816) 513-1500.

St. Louis: A County of 90+ Municipalities

St. Louis presents a unique permitting challenge because of the region's fragmented municipal structure. The City of St. Louis is an independent city separate from St. Louis County, and St. Louis County contains over 90 municipalities, each with its own building department (or a contract with the county for code enforcement).

St. Louis County's standard threshold for detached utility sheds is 120 square feet. Sheds exceeding 400 square feet or with a roof eave height greater than 10 feet must follow the county's Residential Detached Garage Building Permit Requirements, which involve more detailed plan review.

The first step for any St. Louis County resident is determining whether your municipality handles its own permits or contracts with the county. The county's Department of Public Works processes permits for unincorporated areas and contracted municipalities. Fees are valuation-based, typically $50 to $200 for a residential shed. Review times run two to three weeks.

The City of St. Louis (separate from the county) has its own permitting process through the Department of Public Safety, with fees calculated on estimated construction cost.

Springfield: The 100 Square Foot Line

Springfield has one of the lowest permit thresholds among major Missouri cities. The city requires an approved building permit for all accessory structures greater than 100 square feet. This means even a modest 10x12 shed triggers the permit process.

Springfield also imposes several additional restrictions:

• Maximum of 4 accessory structures per parcel
• Total area of all accessory structures cannot exceed 66% of the primary structure's footprint
• Setback requirements determined by Planning and Zoning
• A site plan must be submitted with every permit application

Permit fees in Springfield typically range from $50 to $150. Applications can be submitted through the city's eCity online system or on paper. Review times are generally one to two weeks for straightforward shed applications.

Columbia: University Town With Standard Rules

Columbia follows the IRC-based 120 square foot threshold that most Missouri cities adopt. Sheds under 120 square feet don't need a building permit but must comply with zoning requirements including setbacks and placement in the rear yard.

Columbia's Community Development Department handles both zoning and building permit reviews. The city requires a site plan showing the shed's location, dimensions, and distances from property lines. Permit fees range from $50 to $150, and review times are typically one to two weeks.

Independence: Eastern KC Suburb

Independence also follows the 120 square foot threshold. The city's Community Development Department reviews all accessory structure applications for both building code and zoning compliance.

Sheds in Independence must meet standard setback requirements and cannot be placed in front yards or within easements. Fees range from $50 to $125, with review times of one to two weeks.

Foundation and Anchoring Requirements

Missouri's climate brings both severe thunderstorms and ice storms, making shed anchoring a practical necessity as well as a code requirement. Most Missouri municipalities follow IRC standards for accessory structure foundations:

• Sheds under 200 square feet can typically sit on gravel pads, concrete blocks, or skids without a permanent foundation
• Sheds over 200 square feet in most jurisdictions need a concrete slab or equivalent permanent foundation
• Missouri's frost depth ranges from 24 inches in the southern part of the state to about 36 inches in the northern counties near Iowa
• The IRC frost protection exemption allows freestanding structures of 400 square feet or less with an eave height of 10 feet or less to skip frost-depth footings
• All sheds must be anchored to resist wind uplift — ground anchors, concrete anchors, or slab attachment are standard methods

The foundation type can also affect the permit requirement. In some jurisdictions, placing any structure on a permanent concrete slab triggers a building permit regardless of the shed's size, since the permanent foundation implies a permanent structure.

Electrical and Plumbing: Separate Permits Always

Every Missouri municipality requires separate trade permits for electrical and plumbing work in a shed. This applies regardless of the shed's size and regardless of whether the shed itself needed a building permit.

Adding a simple outlet and light to a 10x10 shed that was exempt from a building permit still requires an electrical permit pulled by a licensed electrician. Running water to a shed requires a plumbing permit. In some jurisdictions, adding utilities to an otherwise exempt shed also triggers a building permit for the structure itself.

Missouri does not have a statewide electrical licensing requirement, so electrician licensing varies by municipality. Most larger cities require a licensed master electrician to pull electrical permits.

Pre-Built Sheds and the Portable Building Market

Missouri has a robust portable and pre-built shed market, with manufacturers throughout the state's rural communities. The state does not distinguish between site-built and delivered sheds for permitting purposes — the same size thresholds, setback rules, and zoning requirements apply.

A common mistake: ordering a delivered shed without checking zoning requirements first. The shed arrives, the crew places it in the backyard, and the homeowner discovers it's 2 feet inside a setback or over the lot coverage limit. Getting the zoning review done before delivery avoids this problem entirely.

HOA Restrictions

Missouri has a significant number of Homeowners Association (HOA) communities, particularly in the Kansas City and St. Louis suburbs. Developments in Lee's Summit, O'Fallon, St. Charles, and Blue Springs frequently have detailed covenants governing accessory structures.

Common HOA restrictions include size limits more restrictive than city code, matching material and color requirements, screening from the street, and in some cases outright prohibition of certain shed types. Missouri's Homeowners Association law gives associations enforcement power including fines and liens. Always check your HOA covenants before purchasing or building a shed.

Consequences of Skipping the Permit

Building without a required permit in Missouri can result in:

• Stop-work orders and daily fines
• Retroactive permits with penalty fees — some cities charge double
• Removal orders for structures violating setbacks or zoning
• Sale complications when unpermitted structures are discovered during inspections
• Insurance denial for unpermitted structures

Permit fees for Missouri sheds are generally modest — often under $150 for a standard storage shed. The risk of building without one isn't worth the savings.

If you're also planning a garage or carport alongside your shed, Missouri cities typically limit the number and combined area of accessory structures per lot.

For an overview of all building permit requirements in Missouri — including decks, fences, patios, and more — see our complete Missouri building permit guide.