Seawall raising in Miami Beach

Who needs a seawall raised

Owners whose walls overtop at king tides, owners who have been cited, and owners planning a repair big enough to trigger the city's height rule.

• Water over the cap at high tide
• A city citation for overtopping
• A repair of $300 or more per linear foot in Miami Beach
• Plans to sell, rebuild or add a dock

The 4 ft option

Building to 4 ft NAVD now is allowed only if the wall and footing are designed to take a cap raise to 5.7 ft later. That design choice is made at the start, so we confirm it with the engineer before anything is priced.[1]

Paying for it

The PPA program accepts seawall applications on a rolling basis until capacity is reached. The grant covers the full scope including the $2,500 assessment value, and qualifying low to moderate income households need no match up to $17,500. An application does not guarantee funding.[2]

A Class 5 flood insurance community

Miami Beach moved to Class 5 in FEMA's Community Rating System in 2019, raising the citywide flood insurance saving from 20% to 25% from 1 May 2019. The City also notes that groundwater rises through the porous rock under the island, which is why barriers and vents matter even behind a raised seawall.

Raising the wall stops tidal overtopping, but the home behind it still relies on its own flood protection.[3][4]

What bringing a wall to code has cost

The City's 2017 rule of thumb was $1,000 to $1,500 per linear foot to bring an old private seawall up to code. Prices have moved since, but the figure shows why owners plan raises with the grant, PACE financing and the City's seawall elevation tool in hand.

Use those figures as a starting point and expect a quote based on your wall's length, depth and access.[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.

Those numbers show how much margin a raised wall really gives above an ordinary high tide.[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][5]

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.[4]

Permits 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.

Seawall height rules by city

Each city sets its own standard, and they do not all use the same vertical datum (NAVD 88 or the older NGVD 1929), so the engineer's survey must state the wall height in the same datum as your city's rule.

Miami Beach: 5.7 ft NAVD for new walls and substantial repairs, or 4 ft NAVD designed to reach 5.7 ft. Coral Gables: a minimum of 6 ft NGVD 1929, structurally able to support 7.5 ft. Fort Lauderdale: a minimum of 5 ft NAVD88, and walls permitted before 1 January 2035 may be built at 4 ft if designed to reach 5 ft by 1 January 2050. Boca Raton: new or replaced walls between 4.0 and 6.0 ft NAVD88, designed to take another 12 to 18 inches.

City of Miami: a 2020 proposal set 6 ft NAVD 88 east of US-1. We have not confirmed it was adopted, so we check with the City for each job.[1][9][11][12][8]

Help with the cost

Miami Beach's Private Property Adaptation program accepts seawall applications on a rolling basis and reimburses 50% of costs up to $20,000, including the $2,500 assessment value; qualifying low to moderate income households need no match up to $17,500. Homes built at least 1 ft above base flood elevation are not eligible. Coral Gables waives a fee for existing homes raising seawalls for sea level rise.[2][10]

Frequently asked questions