At a glance
| Vinyl sheet pile | Composite sheet pile | Concrete | |
|---|---|---|---|
| Published price (Fort Lauderdale contractor) | $1,200–2,000 per ft | Not published there | $1,500–2,200 per ft |
| Salt water | Doesn't rust or rot | Doesn't rust or rot | Steel inside can corrode, cracking the concrete |
| Strength | Lower. Suits moderate heights and calmer water. | Higher. Suits taller walls. | High |
| Claimed lifespan | 50+ years (vendors) | Similar to vinyl (vendors) | 40+ years if well built (vendors) |
| Install in front of old wall | Often possible | Often possible | Usually means demolition |
Vinyl
Vinyl sheet piling is the common residential choice in Florida for low-maintenance walls of moderate height. It doesn't corrode or rot, it's light, and individual sections can be repaired. It can be harder to drive into dense or rocky ground, and it lacks the strength of concrete or metal for tall walls or rough water.
Composite
Composite sheet piling is the stronger plastic option, used for taller walls and heavier-duty work such as marinas. Its expected life is similar to vinyl's.
Concrete
A well-built concrete wall can last for decades. Its weakness in salt water is the steel inside: chlorides get into the concrete, the rebar rusts and expands, and the cap and panels crack. See seawall cap repair. Concrete is also the base for living seawall panels, which Fort Lauderdale encourages with a permit fee waiver.
Building in front of the old wall
Vinyl and composite are light and thin, so they can often be driven just in front of an existing wall without tearing it out, saving demolition. Whether that's allowed, and how far forward, depends on local rules and permits. See your county's permits page.
What matters more than the material
- Engineering: panel length and embedment, and tieback and anchor design.
- Drainage: weep holes and filter fabric, so water pressure doesn't build up behind the wall.
- Height: building to today's height rules (5 ft NAVD88 in Broward) costs far less now than raising it later. See the 5 ft rule.
- Installation quality, which is down to the contractor. See choosing a contractor.
More prices are in the seawall cost guide.
Sources: Fort Lauderdale contractor prices. Vinyl and composite manufacturer information from Everlast Seawalls. Installer guide from Decks & Docks.
This page summarizes published rules and prices for general information. It isn't engineering or legal advice, and codes change. Your contractor, engineer and building department have the final word for your property.
Common questions
Is a vinyl seawall cheaper than concrete?
Usually a little. One Fort Lauderdale contractor publishes $1,200–2,000 per linear foot for vinyl replacement and $1,500–2,200 for concrete. The difference often matters less than height, soil, access and permits.
How long does a vinyl seawall last compared with concrete?
Manufacturers and installers claim 50 years or more for vinyl, and 40 years or more for well-built concrete. Vinyl doesn't corrode, while concrete's steel can rust in salt water. But these are vendor figures. Drainage, tiebacks and installation quality decide lifespan as much as the material does.