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RETAINING WALLS

Retaining Wall Cost Calculator

Estimate the cost of a retaining wall by length, height, material, base and drainage.

JOB INPUTS

Enter your numbers

Loading saved values

Wall length in feet

ft
Wall length in feet

Wall height in feet

ft
Wall height in feet

Wall material type

Wall material type

Excavation difficulty

Excavation difficulty

Prepare a compacted gravel base

Prepare a compacted gravel base

Drainage pipe + gravel behind wall

Drainage pipe + gravel behind wall

Steel or geogrid for tall walls

Steel or geogrid for tall walls

Haul away excess soil

Haul away excess soil
Results update automatically
CALCULATED RESULTUSD
Estimated total cost$3,624.00
Materials$1,200.00
Labor$1,584.00
Base + drainage$400.00
Reinforcement$360.00
Disposal$80.00
FORMULA USED120 sq ft × $10.00 + 120 sq ft × $13.20 + extras = $3,624.00

HOW TO USE IT

How to use the Retaining Wall Cost Calculator

  1. 1

    Enter the wall length and height in feet.

  2. 2

    Choose the material (block, stone or timber).

  3. 3

    Set excavation difficulty, base, drainage and reinforcement.

  4. 4

    Review the total cost and line-item breakdown.

THE MATH

Retaining wall cost formula

Total = wall area × (material + labor) + base + drainage + reinforcement + disposal

Wall area = length × height. The calculator starts with planning allowances of about $10/sq ft for block, $18 for stone, $12 for timber and $12 for labor. Height, surcharge, soil and local rules determine whether engineered reinforcement is required.

PRACTICAL EXAMPLE

40 ft × 3 ft block wall

Area = 120 sq ft. Materials = $1,200. Labor with moderate excavation = $1,584. Base = $160. Drainage = $240. Reinforcement = $360. Disposal = $80. Total = $3,624.

FAQ

Frequently asked questions

How much does a retaining wall cost in 2026?

Use $20-$50/sq ft as a planning range and confirm material, excavation and design requirements for the site.

When is reinforcement required?

Height is only one factor; surcharge, soil and local rules determine when an engineered design is required.

Is drainage needed?

The design must manage water behind the wall; the correct detail depends on soil and the approved wall design.