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🧱 Retaining Wall Cost Calculator

Estimate the cost to build a retaining wall. Covers interlocking block, timber, and boulder styles with drainage and backfill.

Project Details

Wall Length (ft)

Total length of the retaining wall

Wall Height (ft)

Height of the finished wall above grade (max 4 ft for DIY)

Wall Type (1=interlocking block, 2=timber, 3=boulder)

1 = interlocking concrete block, 2 = landscape timber, 3 = natural boulder

Your Estimate

Enter your details and hit Calculate to see results.

Recommended Tools & Supplies

Compact gravel base for a level, stable wall footing

Keep each course of block or timber perfectly level

Score and split blocks for corners and end cuts

Set blocks without cracking; adjust position without damage

Excavate the footing trench and backfill gravel

Editorial picks. Links go to Amazon — we may earn a small commission at no extra cost to you.

Pro Tips

✓ Bury the first course 6 inches below grade — the foundation row is invisible but critical
✓ Install drainage pipe and gravel behind every retaining wall or hydrostatic pressure will push it over
✓ Step back each course 1 inch per foot of height (batter) for long-term stability
✓ Walls over 4 ft require a permit and engineering in most jurisdictions — check before you dig

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