Seawall repair in Miami Beach

Signs you need seawall repair

Call us when you see any of these. Each one lets water and soil move through the wall, and the damage speeds up once it starts.

• Cracks, spalling or rust stains on the cap or face
• Open or leaking joints between panels
• Sinkholes or soft ground just behind the wall
• Water seeping through the wall at high tide
• A cap or panels leaning toward the water

Substantial or not?

The city measures substantial repair by cost per linear foot, not by percentage. A $20,000 repair on 100 feet of wall is $200 per foot and stays below the line; the same spend on 50 feet is $400 per foot and crosses it.[1]

County rules still apply

DERM exempts crack sealing and spall repair on the cap or face, pilaster repair and backfilling, while cap and tieback replacement need an expedited authorisation. Miami Beach still issues its own building permit.[2][1]

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][4]

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.[5]

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.

How do you repair a seawall?

We start with a close inspection at low tide to find where water and soil are moving. Then the fix matches the fault: crack injection or patching for the face, rebuilt concrete for spalled caps, new tie rods and anchors where the wall is leaning, and compacted fill behind the wall once it is sealed.

1. Inspect the cap, face, joints and toe at low tide
2. Confirm the permit path (exempt, expedited or short form)
3. Seal joints and cracks, repair spalls
4. Replace tiebacks or the cap if needed
5. Backfill and restore the yard

Which seawall repairs need a permit?

Miami-Dade DERM lists as exempt: sealing cracks and spall repair on the cap or face, repair or sealing of pilasters, backfilling landward of an existing seawall, riprap or gunite tubes under an undercut wall no more than 2 ft waterward, and sand-cement bags at the toe no more than 2 ft waterward. Cap and tieback repair or replacement need structurally approved plans from the building department and an expedited DERM authorisation. Your city may still need a building permit.[2]

Repair or replace?

If the panels are sound and the wall is tall enough for local rules, repair is usually the better value. If repairs would cross a city's substantial repair line, such as $300 per linear foot in Miami Beach, you may have to raise the whole wall anyway, and replacement can make more sense.[1]

Frequently asked questions