Free tool 20+ years on the water 8 states served
Last updated: June 2026 — pricing from real retaining-wall projects.
A retaining wall typically costs $15–$70+ per square foot of wall face, depending on the material, wall height, length and site conditions. Use this free calculator to estimate your retaining-wall price by material — timber, gabion, composite, stone, concrete block, riprap, metal or brick — then download a PDF estimate to keep. Walls are priced per square foot of wall face (length × height); to compare against a per-linear-foot quote, multiply the $/SF by your wall height. Building a waterfront wall instead? Use our bulkhead cost calculator, or compare all our cost calculators.
Quick answer: most retaining walls cost $15–$70+ per square foot of face area installed. Treated timber and gabion are usually the lowest-cost options; segmental concrete block is the popular all-rounder; natural stone and brick masonry sit at the top for looks and longevity.
Retaining-wall pricing is quoted per square foot of wall face (length × height), and a few factors move that number up or down. The calculator above accounts for the big ones; here's what's behind the range:
| Material | Typical cost / SF | Best for | Typical lifespan |
|---|---|---|---|
| Treated timber | $15–$35 | Budget walls, garden & terraced grades | 15–25 years |
| Gabion basket | $20–$45 | Free-draining, rustic & erosion control | 50–75 years |
| Composite / vinyl | $20–$45 | Low-maintenance, rot-proof walls | 40–50+ years |
| Natural stone | $25–$60 | Premium looks, long lifespan | 75–100+ years |
| Concrete block (SRW) | $25–$60 | All-rounder — strong & versatile | 50–75 years |
| Riprap scrim bags | $30–$50 | Slopes & natural erosion control | 30–50 years |
| Metal / steel | $30–$60 | Tall or high-load / structural walls | 40–60 years |
| Brick / masonry | $30–$70+ | Architectural finish to match a home | 75–100+ years |
Ranges are a per-square-foot baseline from real projects. The calculator's live number is adjusted for your wall height — taller walls land toward the high end of each material's range, shorter walls toward the low end. Multiply your $/SF by the wall face area (length × height) for a project ballpark.
To turn a per-square-foot range into a project ballpark, multiply by the wall face area (length × height):
These cover the wall structure and drainage; excavation, backfill, permits and mobilization are quoted separately. Cost per square foot also climbs with height as footings deepen and reinforcement is added — a mid-range concrete-block wall runs about $25/SF at 2 ft, ~$40/SF at 6 ft and ~$55/SF at 10 ft.
Lifespan varies widely by material. Treated timber lasts 15–25 years — cheapest upfront but replaced within a generation. Gabion baskets and concrete segmental block (SRW) last 50–75 years; composite/vinyl 40–50+ years with no rot; metal/steel 40–60 years depending on coating and soil. Natural stone and brick masonry last 75–100+ years — the lowest cost-per-year choice despite the higher upfront price. Every Shore Protect wall includes drainage (gravel backfill, filter fabric and weep drains), because drainage failure is the number-one cause of premature wall failure regardless of material.
DIY vs. professional & permits: a short garden wall under 2–3 ft is often a DIY project, but any wall taller than about 4 ft holds back serious soil load and typically needs an engineered design and a building permit. Shore Protect handles the engineering and permitting in every state we serve.
Explore detailed pricing: retaining-wall construction & cost guide, Houston retaining-wall cost, bulkhead cost, compare all our cost calculators, or browse our completed waterfront projects.
Honest answers about retaining-wall pricing — what a wall costs per square foot, the cheapest material, how drainage drives cost, and what this estimate covers.
A retaining wall costs $15 to $70+ per square foot of wall face, installed. The exact number depends on the material: treated timber $15–$35, gabion $20–$45, composite/vinyl $20–$45, natural stone $25–$60, concrete block (SRW) $25–$60, riprap scrim bags $30–$50, metal/steel $30–$60 and brick masonry $30–$70+ per square foot. Taller walls land toward the top of each range; multiply your $/SF by the wall face area (length × height) for a project total.
Treated timber is usually the cheapest option, starting around $15 per square foot, with gabion baskets close behind ($20–$45 per square foot). Both are budget-friendly, but segmental concrete block ($25–$60 per square foot) often delivers the best long-term value because it lasts far longer than timber. The lowest sticker price isn't always the cheapest over a wall's service life.
Treated timber is the lowest cost but the shortest lived. Segmental concrete block (SRW) is the most popular all-rounder — strong, versatile and mid-priced ($25–$60 per square foot). Natural stone and brick masonry ($25–$70+ per square foot) cost the most but give the best looks and longest lifespan. The best choice balances budget, wall height and the finish you want.
Water building up behind a wall is the number-one cause of failure. A proper wall is built with free-draining gravel backfill, filter fabric and weep drains or a drain pipe so water can escape instead of pushing on the wall. That drainage package is part of every Shore Protect retaining wall, and it's a big reason the per-square-foot price is higher than a plain garden border.
Yes. Taller walls hold back far more soil pressure, so they need deeper footings, geogrid reinforcement, engineering and sometimes tiering — all of which raise the cost per square foot. That's why the calculator nudges your price toward the high end of each material's range as wall height increases. Walls over about 4 feet often need an engineered design and a permit.
The per-square-foot range covers the retaining-wall structure itself — the wall facing, geogrid or deadman anchors, drainage gravel, filter fabric and cap. It excludes excavation, backfill behind the wall, permits and mobilization, which are quoted separately because they depend on site conditions.
It's a planning ballpark, not a binding quote. The ranges come from real retaining-wall projects and are adjusted for your material and wall height. The firm price comes after a site review of soil, drainage, grade and access conditions — estimates are reviewed by Roman Ross, Marine Construction Estimator at Shore Protect Construction.
Retaining walls are priced per square foot of wall face, but you can convert to a per-linear-foot figure by multiplying the $/SF rate by the wall height. For example, a 4-foot timber wall at about $18 per square foot works out to roughly $72 per linear foot, while a 6-foot concrete-block wall at about $40 per square foot is roughly $240 per linear foot. Taller walls cost more per linear foot because there is more face area and deeper footings per foot of length.
In most jurisdictions a retaining wall over about 4 feet tall (measured from the bottom of the footing to the top of the wall) requires a building permit and an engineered design; some areas set the threshold lower or require a permit for any wall near a property line, slope or drainage easement. Walls under 2–3 feet are usually exempt. Shore Protect confirms the local requirement and handles the permit and engineering in every state we serve.
Retaining-wall repair typically runs $25–$75 per square foot, depending on the cause — failed drainage, a leaning or bulging section, footing settlement or cracked block. Minor fixes (re-grading, adding weep drains, replacing a few courses) sit at the low end; structural rebuilds approach full replacement, which runs $30–$70 per square foot. We always diagnose the root cause first — most failures trace back to water behind the wall — so the repair lasts instead of failing again.
The ranges in this calculator come from estimates on jobs like these:
Shore Protect