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When repair stops making sense, the question becomes material, height, anchoring, and permits. A wall built right for Lowcountry conditions is a 30-to-50-year asset; a wall built wrong is a 10-year liability with your landscaping on top of it.
Vinyl sheet pile — the modern default for residential tidal creeks. Immune to rot and marine borers, clean appearance, 40+ year service life. Mid-range cost.
Timber — the traditional Lowcountry wall. Lowest upfront cost, shortest life in brackish water, and increasingly hard to justify except for repairs that match existing structure.
Concrete — maximum strength and wave resistance; the right call on open-water exposures. Highest cost, and quality of the pour and reinforcement is everything.
Steel sheet pile — commercial-grade strength for deep water and tall walls; over-spec for most home sites but the answer when nothing else is.
Full price ranges per linear foot are in the cost guide.
Survey and design. OCRM critical-area permitting (figure this into your timeline — it's usually the longest phase). Demolition or front-facing installation over the old wall where conditions allow. New sheeting, piles, whalers, tiebacks, deadmen or helical anchors, filter fabric, backfill, and cap.
Two scheduling realities worth knowing: marine contractors work the tides, not the clock — and the permit calendar, not the construction calendar, usually decides your completion date. Starting the process in fall means the wall is in before the next hurricane season.