How Much Does a Retaining Wall Cost Per Foot?
Quick Answer
A retaining wall costs roughly $40 to $240 per linear foot installed, driven mainly by wall height and material. A typical 3-foot block wall runs about $60 to $105 per linear foot, because cost scales with the face area — taller walls cost far more per foot of length.
- Block, 3 ft high: ~$60–$105 per linear foot installed
- Poured concrete, 3 ft high: ~$90–$150 per linear foot
- Natural stone, 3 ft high: ~$120–$180 per linear foot
- Cost per foot roughly doubles when the wall height doubles
Formula
Retaining walls are priced by the square foot of face, so the cost per linear foot of length equals the wall height multiplied by the per-square-foot rate for your material.
Step-by-Step Calculation
- 1
Pick your wall height
Example: 3 ft high
- 2
Pick a cost per sq ft
Block installed ≈ $28 per sq ft
- 3
Multiply for cost per foot
3 ft × $28 = $84 per linear foot
- 4
Multiply by wall length
40 ft × $84 = $3,360 installed
Retaining Wall Cost Per Linear Foot (by height)
| Material | 2 ft high | 3 ft high | 4 ft high |
|---|---|---|---|
| Segmental block | $40–$70 | $60–$105 | $80–$140 |
| Poured concrete | $60–$100 | $90–$150 | $120–$200 |
| Natural stone | $80–$120 | $120–$180 | $160–$240 |
*Per linear foot of wall length, installed. Walls over 4 ft usually need a permit and engineering, which adds cost.
Frequently Asked Questions
Why is retaining wall cost quoted per square foot, not per foot?
Because the real driver is the wall face area. A 2-foot wall and a 4-foot wall of the same length use very different amounts of block, backfill, and footing, so contractors price by the square foot of face and convert to per linear foot once the height is known.
How do I turn cost per sq ft into cost per foot?
Multiply the per-square-foot rate by the wall height. At $28 per sq ft, a 3-foot wall costs about $84 per linear foot, while a 4-foot wall costs about $112 per linear foot.
What is the cheapest way to lower cost per foot?
Keep the wall under 4 feet to avoid engineering fees, choose segmental block over stone or poured concrete, and do the base prep and stacking yourself. DIY block materials run about $10 to $15 per sq ft of face.