Seawall Repair Key Biscayne, FL

Miami-Dade DERM Class I coastal-construction permit. FDEP; USACE for Biscayne Bay / navigable waters. New/replaced seawall cap must sit >=6" above adjacent grade; Biscayne Bay Environmental Enhancement Trust Fund mitigation; manatee conditions in-water

We serve waterfront properties along Biscayne Bay, the Atlantic, and Bear Cut. Service areas include Village of Key Biscayne, bayfront canals. Call 866-398-9323 to confirm service at your specific address.

Direct Biscayne Bay and Atlantic exposure with storm surge on a barrier island; aging seawalls under the DERM cap rule.

Seawall repair in Key Biscayne typically costs $225–$600 per linear foot. An 80-foot Biscayne Bay and the Atlantic Ocean residential bulkhead runs $10,000–$32,000 for repair versus $35,000–$70,000 for full replacement. Call 866-398-9323 for a free on-site estimate.

The primary causes are Biscayne Bay hyper-saline tropical water with extreme summer heat amplifying rebar corrosion rates inside concrete panels. Combined with island sandy substrate with full Atlantic Ocean and Biscayne Bay exposure creating multi-directional wave stress, these forces accelerate void formation, panel cracking, and joint separation. Key Biscayne's combination of Biscayne Bay's high salinity and South Florida's tropical heat creates the most corrosive seawall environment in Miami-Dade County — rebar corrosion progresses faster here than anywhere else in our service area.

Most Key Biscayne seawall repairs using polyurethane injection or helical tiebacks are completed in 1–2 days. We schedule work around low tide windows for maximum access and accuracy.

Structural repairs including tieback installation and cap replacement require Miami-Dade County permits and may require DEP or Army Corps review for waterfront properties adjacent to Biscayne Bay and the Atlantic Ocean. Polyurethane injection and maintenance repairs generally do not require permits. We handle all permitting coordination for major projects.

We recommend annual inspections for seawalls older than 20 years, plus inspection after every named storm event. Key Biscayne's combination of Biscayne Bay's high salinity and South Florida's tropical heat creates the most corrosive seawall environment in Miami-Dade County — rebar corrosion progresses faster here than anywhere else in our service area. Early detection of voids and micro-cracks costs far less to address than waiting for visible structural failure.