Seawall repair in Key West
or the Lower Keys?

Public prices for private canal walls are hard to find. The clearest numbers are Key West’s own waterfront jobs: about $1,820 a foot for a 2017 concrete encasement repair, and about $3,140 a foot for a 2017 sheet pile replacement with tiebacks. Key West ITB 17-019 Key West RFP 004-17 Both included dock or design work, so treat them as a ceiling, not a quote. The cost guide shows what drives a home price, from wall length to barge access.

Almost always. Key West requires a permit for work over $1,000, and Key Colony Beach’s seawall manual says every repair needs a city permit. Key West permits page KCB Seawall Owner’s Manual Monroe County’s new under-$7,500 exemption excludes structural work and any property in a flood hazard area. Monroe County exemption notice State exemptions for canal walls do not replace the local permit. Rule 62-330.051(12) The permit guide shows the full route.

The parcel decides, not the mailing address. Key West, Marathon, Key Colony Beach and Layton issue their own permits, and Monroe County covers the rest. FloridaCommerce, Keys critical areas Key Haven, Rockland Key and the south side of Stock Island have Key West addresses but sit outside the city. Key West floodplain page Marathon runs from the Seven Mile Bridge to the Tom’s Harbor Bridge, Grassy Key included. Marathon Charter, Sec. 10

Plan in months, not weeks, unless the job is a simple repair on a canal. The marine sanctuary wants applications at least 90 days before work, and its seagrass surveys run only from June 1 to September 30. Sanctuary permits page Sanctuary survey protocol In unincorporated Monroe County, no work starts until a $976 Notice to Proceed follows the state and federal approvals. Monroe County NTP handout Res. 277-2025

Start with what is failing: one cracked cap section is often a repair, while a wall leaning along most of its length may not be. Most Key Colony Beach walls were designed for a 30-year life, and many have passed it. KCB Seawall Owner’s Manual A replacement in unincorporated Monroe County must keep the old footprint as far as practicable. Monroe County code 118-12(k)(4) Compare both paths in the repair-or-replace guide.

Usually not. The federal flood policy lists seawalls, bulkheads and docks as property not insured, with a narrow exception for a wall that directly supports the house foundation. Federal flood policy (Dwelling Form) FEMA flood policy commentary FEMA’s 2024 declarations for Debby, Helene and Milton gave Monroe County public assistance only, with no aid for households. OpenFEMA declarations Get a written answer from your insurer, and see the insurance guide.

Photograph and video the wall, yard and dock before cleanup, and keep people off ground that has sunk. NFIP documentation guidance Write down the damage date, because the state’s storm exemptions for restoring seawalls and docks are tied to damage within the last year. Rule 62-330.051(12) Rule 62-330.051(5) In Marathon, emergency repairs may start if the permit application follows within 48 hours. Marathon Building Department The storm guide covers the rest.

Usually not. Unincorporated Monroe County and Marathon ban new vertical seawalls on open water. Monroe County code 118-12(k)(3) Marathon code 106.36 Key West allows hardening only when erosion is a critical peril, and riprap comes first. Key West Code 110-182 Key Colony Beach is the exception: it requires seawalls wherever state and federal agencies allow them, as the replacement guide explains. KCB Code 5-25