Miami-Dade Shed Permits: Sizes, HVHZ Rules, and Fees

Do you need a shed permit in Miami-Dade County?

Yes, and there is no size that gets you out of it. Miami-Dade County requires a building permit to install any shed or utility storage building, prefab or site-built, no matter how small. That is the honest answer to the common search for a maximum shed size without a permit: in Miami-Dade there isn't one.

What the county does cap is how much shed you can have. Under Section 33-20(k) of the Miami-Dade County Code, a residential lot is allowed one utility shed, up to 400 square feet, and it has to be a single-story, non-habitable, detached building used for storage only. The reason the rules are this strict is location: all of Miami-Dade sits in the High Velocity Hurricane Zone (HVHZ), the toughest building-code region in the continental United States. For how Florida handles sheds statewide, see our shed permits in Florida guide, and for the national baseline, the complete shed permit guide.

The High Velocity Hurricane Zone and product approval

The HVHZ is what makes a Miami shed different from a shed anywhere outside South Florida. Every component has to be proven to survive hurricane-force wind, roughly 175 mph design speed, and the county checks that proof at permit time.

For a pre-manufactured shed, that proof is a Notice of Acceptance (NOA). You submit the shed's current NOA with the permit, and the drawings must show it meets the current Florida Building Code wind load. You can look up a product's NOA in the county's Product Approval database; a statewide Florida Product Approval is also accepted. A shed sold in another state, with no NOA and no Florida approval, cannot be permitted here, which catches a lot of homeowners who buy a big-box shed kit.

For a site-built shed, you need construction drawings signed and sealed by a Florida-registered architect or engineer, covering the foundation, walls, roof, and the anchoring that keeps the shed on the ground in a storm. Small prefab sheds are typically held down with auger-style ground anchors and straps rather than a slab.

Flood zones: elevation and vents

Much of Miami-Dade lies in a Special Flood Hazard Area (SFHA), and that adds a step. A residential prefab or wood shed under 400 square feet that is outside the floodplain has no flood requirement. Inside an SFHA, you have two options:

• Elevate the shed floor to or above the Base Flood Elevation (BFE), shown on the plans, which then needs an Elevation Certificate before the final inspection, or
• Provide flood vents: at least 1 square inch of opening for every square foot of shed floor area, split across at least two walls, with the bottom of the openings no more than 1 foot above the finished floor.

If you take the vent option, a DERM floodplain inspector has to verify the openings before the county signs off. Check your flood zone before you decide where and how the shed sits.

Miami city or unincorporated county: where to apply

Miami-Dade is a mix of incorporated cities and unincorporated county, and that decides which building department you use. If your address is in unincorporated Miami-Dade, you apply to the county Building Division (part of Regulatory and Economic Resources) at 11805 SW 26th Street. If your address is inside the City of Miami, you apply to the City of Miami Building Department at the Miami Riverside Center, 444 SW 2nd Avenue, through the city's iBuild portal. Both enforce the same HVHZ code.

Either way, the application needs your property's folio number, the 13-digit parcel number from your tax bill, a site plan showing the shed's size and its distance to every property line and structure, and, for a utility shed, a signed Attestation for Utility Shed or Storage Structure form. If you pull the permit as the owner rather than through a licensed contractor, Miami-Dade requires you to pass an owner-builder exam first.

What a Miami-Dade shed permit costs and how long it takes

Miami-Dade prices the permit on the shed's construction value, not a flat rate, and adds a 7.5 percent surcharge plus fees from any other agency involved, such as flood review. The county adopted a revised fee schedule in October 2025, its first increase in more than 17 years. In practice a small prefab shed permit runs a couple hundred dollars, while a site-built or flood-zone shed with engineered plans costs more, so budget roughly $150 to $500.

Review time depends on the shed. A prefab shed with a valid NOA is a simple residential review and can clear in as little as 1 to 10 business days. A site-built shed, a flood-zone elevation review, or a correction cycle pushes the full process toward a few weeks. Inspections follow the permit, and a shed built on a slab or piers gets a foundation inspection before the pour and a final inspection at the end.

Setbacks and zoning for a Miami-Dade shed

Zoning sets where the shed can sit, and it is reviewed separately from the structural side. A utility shed has to respect your zoning district's setbacks from the side and rear property lines, stay within the one-shed and 400-square-foot limits, and remain non-habitable and storage-only. Because setbacks vary by district, the county directs shed applicants to confirm them with the Zoning Plans Processing Section at 786-315-2660 before finalizing the location.

Draw the shed on your site plan with exact distances to each lot line and to other structures, and mark whether water, sewer, or a septic tank and well are nearby. Getting the placement right up front avoids a rejected application or, worse, a finished shed a reviewer makes you move.

Building a shed without a permit in Miami-Dade

Skipping the permit is a serious risk here in a way it is not in calmer climates. An unpermitted, un-anchored shed is the structure most likely to become airborne in a hurricane, and if it damages your home or a neighbor's, your insurer can deny the claim outright. The county can also issue a stop-work order, require a retroactive permit with after-the-fact fees, and order an unsafe or non-compliant shed removed.

The paperwork follows the property too. Unpermitted structures surface in title searches and home inspections, and buyers routinely make closing contingent on open permits being resolved. Permitting a shed after the fact, when you may have to prove HVHZ compliance on a shed that was never designed for it, costs far more than doing it right the first time.