Shed, Accessory Structure and Detached Garage Permits in South Florida 2026

Shed, Accessory Structure and Detached Garage Permits in South Florida

Sheds, storage buildings, utility structures, pool houses, detached garages, workshops, and carports are all classified as accessory structures under the Florida Building Code. In Miami-Dade County, Broward County, and Palm Beach County, virtually every accessory structure that is permanent — meaning attached to a foundation or too large to relocate without disassembly — requires a building permit. Many property owners mistakenly believe that a small utility shed does not require a permit, but Miami-Dade County's Regulatory and Economic Resources (RER) department publishes explicit Utility/Storage Shed Permit Requirements that specify the conditions under which permits are mandatory. Failing to obtain a required permit before construction creates code violations that become part of the property record, are disclosed during real estate transactions, and can require demolition years after the structure was built.

Miami-Dade County Utility Shed Permit Thresholds

In unincorporated Miami-Dade County, a utility shed or storage building that is 100 square feet or less in floor area and no more than one story in height may qualify for a simplified building permit process, but it is not entirely exempt from permitting. The structure must comply with zoning setback requirements, must be an accessory to a principal use, and must not be used for habitation. Any shed exceeding 100 square feet requires a full building permit with a structural plan review. Sheds with electrical connections — even a single outlet or light fixture — require a separate electrical permit regardless of size. Sheds with plumbing require a plumbing permit. Pool houses with bathroom facilities require building, electrical, and plumbing permits, and may trigger a review by the Miami-Dade Water and Sewer Department.

Detached Garage Permit Requirements

A detached garage is a major accessory structure requiring a full building permit in all three South Florida counties. The permit application must include architectural and structural plans signed and sealed by a licensed architect or engineer, a site plan drawn to scale, a boundary survey and topographic survey (valid within one year — renewal costs $800 USD to $8,500 USD if expired), and a Notice of Commencement recorded with the Clerk of Courts. In Miami-Dade County, all detached garages must comply with the High-Velocity Hurricane Zone (HVHZ) provisions of the Florida Building Code, which impose stringent wind load requirements for roof-to-wall connections, door and window openings, and roof coverings. The garage door itself requires a product approval (NOA — Notice of Acceptance) demonstrating compliance with Miami-Dade County's wind velocity requirements — one of the most demanding in the nation.

Accessory Dwelling Units and Guest Houses

An accessory dwelling unit (ADU), guest house, or in-law suite that is detached from the principal residence is the most complex category of accessory structure to permit. ADUs include separate sleeping quarters, a kitchen or kitchenette, and a bathroom — making them functionally equivalent to a small residence. Permitting an ADU requires building permits, electrical permits, plumbing permits, and mechanical permits. In many municipalities, a certificate of occupancy must be issued separately for the ADU. Zoning regulations strictly control where ADUs are permitted, minimum lot sizes, maximum ADU square footage as a percentage of the main house, and whether a second water and sewer connection is required. In unincorporated Miami-Dade County, ADUs in single-family residential zones must comply with Chapter 33 of the Miami-Dade County Code. Each municipality — Coral Gables, Miami Beach, Doral, Hialeah, and others — has its own ADU regulations.

Carport Permit Requirements

Carports — open or semi-open roofed structures used for vehicle parking attached to or detached from the main residence — require a building permit in Miami-Dade County, Broward County, and Palm Beach County whenever they are attached to or extend from a principal structure, or whenever they are freestanding and exceed the threshold dimensions in the applicable code. Carport permits require structural plans demonstrating HVHZ wind resistance, including uplift calculations for the roof system. Aluminum carport systems require product approvals issued by Miami-Dade County Product Control. Screen enclosures and carports are frequently damaged or destroyed during hurricanes — having a proper permit and using approved products directly affects your homeowner's insurance claim eligibility after a storm event.

Plan Review and Approval Timeline

Once an accessory structure permit application is submitted to the appropriate building department, the plan review process begins. Miami-Dade County uses the Concurrent Plans Processing (CPP) system to route plans to multiple departments simultaneously — Building Division, Zoning, Environmental, and in some cases Fire Rescue and Public Works. For a straightforward residential shed or detached garage with no environmental impacts, the plan review timeline is typically 5 to 30 days for small residential projects. However, if the site is located near a wetland, coastal construction control line, or other regulated area, DERM review adds additional time. If zoning setback variances are required, the public hearing process adds several months.

Inspections for Accessory Structures

Accessory structure construction requires multiple mandatory inspections by county or municipal building inspectors. The typical inspection sequence for a detached garage includes a footing inspection before concrete is poured, a slab inspection before pouring if applicable, a framing or masonry rough inspection before walls are enclosed, a roofing inspection at specific stages, and a final inspection prior to certificate of occupancy or completion. Inspectors visit the property during normal business hours, and the permit card and approved plans must be on-site at all times. Reinspections after failed inspections carry additional USD fees. Government inspectors, as licensed professionals employed by the county, can make administrative errors — such as failing to appear for a scheduled inspection or marking an inspection as failed without proper justification. These situations must be addressed promptly and in writing with the Building Official, and Endless Life Design has experience forcing expedited reinspections when government errors cause project delays.

Early Start Pass Consideration for Accessory Structures

Miami-Dade County may issue an early start pass for accessory structure construction when plan review is pending but certain structural elements are time-sensitive. Accepting an early start pass means proceeding with foundation work before all plan review approvals are complete. This carries the risk that if the plans are later modified by reviewers — requiring different footing dimensions or reinforcement — the already-poured concrete may need to be demolished. Additionally, work performed under an early start pass may not be covered by the county's inspection guarantee in the same way as fully permitted work. The property owner and contractor assume the financial risk of any nonconforming work discovered after the fact.

Permit Fees and USD Costs

Accessory structure permit fees in Miami-Dade County are calculated based on the valuation of the work — the higher the construction value, the higher the USD permit fee. The Miami-Dade Building Fee Schedule, updated periodically by RER, provides the specific fee per $1,000 USD of construction value. In addition to the base building permit fee, separate USD fees apply for plan review, zoning review, environmental review, inspection fees, and any special programs such as the Green Building Expedited Review. The Notice of Commencement recording fee is paid to the Miami-Dade Clerk of Courts. Property owners should budget for all these USD costs upfront, understanding that cost estimates provided by contractors often do not include the full cost of permitting.

Amnesty and Code Relief for Unpermitted Sheds

Miami-Dade County has an Amnesty Ordinance (Ordinance 02-44, codified as the Code Relief program) that allows property owners to bring unpermitted structures into compliance with the building code. Under this program, structures built without proper permits or built with permits that lacked mandatory inspections can be legalized through a remedial permit and inspection process. The amnesty process is not free — it involves USD fees for the remedial permit, potential structural upgrades if the existing construction does not meet current code, and engineering certifications. However, it is far less expensive than a code enforcement order requiring demolition. If you have an existing unpermitted shed, storage building, or detached garage in unincorporated Miami-Dade County, consulting with a licensed contractor and a permit expeditor about the Code Relief program is strongly recommended.

Contractor Qualifications and Licensing

Accessory structure construction must be performed by licensed contractors in Florida. A General Contractor or Building Contractor license from the Florida Department of Business and Professional Regulation (DBPR) is required for most accessory structure projects. The contractor must also hold a valid Miami-Dade County Local Business Tax Receipt and current insurance — including general liability and workers' compensation. If electrical, plumbing, or mechanical work is involved, licensed subcontractors in those respective trades must obtain their own permits. Do not allow unlicensed contractors to build accessory structures — if an unlicensed contractor builds a structure on your property and it causes damage to a neighbor, you may be held personally liable. Property owners considering owner-builder permits should review the Miami-Dade County Owner-Builder Instructions carefully, as owner-builder permits impose significant personal liability and restrict future sale of the property within one year.

Construction Lien Exposure for Accessory Structures

Just as with larger construction projects, contractors building sheds, garages, and accessory structures in Florida have full lien rights under the Florida Construction Lien Law. If a contractor is not paid for labor or materials, they can file a Claim of Lien against your property, cloud your title, and ultimately pursue foreclosure. Before making final payment on any accessory structure project, obtain a Final Release of Lien and Affidavit from the contractor, which certifies that all subcontractors and material suppliers have been paid. The Notice of Commencement recorded at the beginning of the project establishes the lien period. Never change contractors mid-project without resolving all payment obligations with the departing contractor first.