Estimate blocks, materials, and costs for your retaining wall project by length, height, and material type.
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Estimated cost for a 2-foot tall retaining wall by length and material.
| Length | Concrete Block | Natural Stone | Timber / Railroad Tie | Interlocking Block |
|---|---|---|---|---|
| 20 ft | $300 | $700 | $360 | $440 |
| 30 ft | $450 | $1,050 | $540 | $660 |
| 50 ft | $750 | $1,750 | $900 | $1,100 |
| 75 ft | $1,125 | $2,625 | $1,350 | $1,650 |
| 100 ft | $1,500 | $3,500 | $1,800 | $2,200 |
| 150 ft | $2,250 | $5,250 | $2,700 | $3,300 |
Estimates are for a 2-foot tall wall with materials only. Taller walls cost proportionally more. Professional installation typically doubles the total.
Retaining walls hold back soil on sloped properties, preventing erosion and creating level terraces for gardens, patios, and lawns. They are one of the most impactful landscaping features you can add — both functionally and aesthetically.
For DIY projects, concrete interlocking blocks are the most beginner-friendly option. They stack without mortar and are designed to lean back slightly into the slope for stability. For walls under 3 feet, a homeowner with basic tools can build one in a weekend.
The most important part of any retaining wall is drainage. Water pressure behind a wall is the number one cause of failure. Always install a perforated drain pipe at the base and backfill with gravel — never backfill directly with soil.
Enter your address to view your property slope and plan your retaining wall location.
Also check out our gravel calculator and fence calculator