Docks in Miami Beach

Docks and the seawall behind them

About 50 of the city's roughly 55 miles of seawall are privately owned, so most docks sit on a private wall. If the dock project includes seawall work costing $300 or more per linear foot, that work must meet 5.7 ft NAVD.[1]

Bay bottom and neighbours

Biscayne Bay is mostly state-owned submerged land, and DERM can grant the state's consent for qualifying docks. DERM's D-5 boundary protects neighbours' views and access and can call for consent letters.[2]

Bay-side lots and the aquatic preserve

Lots that face open Biscayne Bay rather than a dredged canal sit on the Biscayne Bay Aquatic Preserve, which counts as Outstanding Florida Waters. There the state dock exemption is 500 sq ft of over-water area, and the preserve says manatees move into the bay in the cooler months.

Grass and hard bottom decide where the dock can go and how high it sits.[3][4][5]

Tide at Government Cut

NOAA's Miami Harbor Entrance gauge at Government Cut, beside South Beach, shows a 2.46 ft mean range and a 2.70 ft great diurnal range, with mean higher high water about 0.33 ft above NAVD 88 (1983 to 2001 epoch). A wall at 5.7 ft NAVD therefore stands roughly 5.4 ft above an average high tide, the margin the City wants for king tides and sea level rise.

The tide sets the deck height and how far a boat rises against the dock.[6]

What makes Miami Beach different

The city has about 55 miles of seawall, of which only about 5 miles are publicly owned, so most of it is the responsibility of private owners. Its seawall ordinance dates from Resolution R2016-4009 in May 2016, was strengthened in January 2021 and amended again in July 2025.[1][8]

Groundwater and flooding

The city notes that groundwater rises through the porous bedrock under Miami Beach, so a seawall alone cannot stop flooding. A raised wall stops tidal overtopping; drainage and flood protection handle the rest.[9]

Permits for docks in Miami Beach

• City of Miami Beach Building Department: Building permit with a site plan, structural plans and an elevation certification.
• Miami-Dade DERM, Coastal Resources Section: Class I permit or exemption for seawalls, docks and lifts on the island canals and the bay, issued alongside the City permit. Phone (305) 372-6575.
• Florida DEP or South Florida Water Management District: State review where a dock or wall reaches open Biscayne Bay, part of the aquatic preserve, where FDEP's free online self-certification is not available.
• US Army Corps of Engineers, Jacksonville District: Federal authorisation for work in Biscayne Bay and Indian Creek; we confirm the small-project route since SPGP VI's stated July 2026 expiry.

How big can my dock be?

It depends on where you are. Florida's statutory exemption covers private docks up to 1,000 sq ft of over-water area, or 500 sq ft in Outstanding Florida Waters, with one exempt dock per 65 ft of shoreline. Over-water area includes roofs, boat canopies, elevated platforms and decking. In Miami-Dade a single-family dock on the short-form permit may not protrude more than 25% of the waterway width.[4][5][2]

Docks over state-owned water

Most of Biscayne Bay and its natural tributaries, including the Miami River, Little River, Oleta River and Arch Creek, are state-owned submerged lands. A dock there needs the state's consent, which DERM can grant on the state's behalf for qualifying projects. FDEP requires structures to sit at least 25 ft inside riparian lines (10 ft for marginal docks), with exceptions.[2][5]

Frequently asked questions