Retaining Wall Installation Cost Estimator
Enter the wall length, height, and material for installed pricing.
Runs entirely in your browser — your numbers never leave this page.
How it works
Installed wall = face area × material rate (+ engineering over 4 ft):
- Timber (~$22/sq ft): cheapest, 15–20 year life — fine for garden beds.
- Segmental block (~$32/sq ft): the standard — DIY-friendly, 50+ year life.
- Poured concrete (~$42/sq ft): strongest, needs forms and expertise.
- Natural stone (~$55/sq ft): gorgeous, premium — dry-stack or mortared.
- Over 4 ft (+35%): engineering, geogrid reinforcement, permits — the law in most places.
- Drainage: gravel backfill + drain tile daylighted out — skip it and the wall fails regardless of material.
Frequently asked questions
How much does a retaining wall cost installed?
About $22/sq ft timber, $32 block, $42 poured concrete, $55 natural stone — face area, installed.
Why are tall walls so much more?
Over 4 ft needs engineering, geogrid, and permits (+35%) — soil pressure grows with the square of height.
Do I need a permit?
Usually for walls over 4 ft (some areas 3 ft). Engineered stamped plans are typically required.
What is the cheapest retaining wall?
Timber at ~$22/sq ft — but 15–20 year life vs 50+ for block. Cheap now, rebuild later.
Why do retaining walls fail?
Water pressure — missing drainage (gravel + drain tile) kills more walls than bad blocks.
Can I DIY a retaining wall?
Under 3–4 ft with segmental block, yes. Taller: hire a pro with engineering.
How long do they last?
Timber 15–20 yrs, block/concrete/stone 50+ yrs with proper drainage.
What is geogrid?
Synthetic mesh layered into the backfill that ties the wall to the soil — required for taller walls.
How much is a 50×4 ft wall?
200 sq ft: ~$4,400 timber, $6,400 block, $11,000 stone — before the over-4-ft premium (not triggered at exactly 4).
Does it add property value?
It creates usable flat land from slopes — valuable, though rarely 100% recouped.