United States calculator
Retaining Wall Cost Calculator
Estimate the cost to build a retaining wall. Adjust the wall length and height, the wall material, and whether you include a gravel-and-pipe drainage system and base excavation to see an itemized low–high range for your project.
How this calculator is built
Unit costs with sources
This model cites 4 sources across line-item unit costs, regional labor data, and tax references.
Regional labor adjustment
The state table applies local labor indexes only to labor-heavy line items.
Published methodology
The methodology page lists the formula, size drivers, labor model, and source links.
Estimate your project
Change the default inputs to match your scope. The breakdown updates by line item.
Retaining Wall Cost by state: typical ranges
Each range applies that state's labor index to the labor-share line items of the default project; materials stay at national prices. Select a state for its full local breakdown and calculator.
| State | Typical range | Labor index | Permit |
|---|---|---|---|
| Alabama | $3,408–$6,330 | 75% | Likely |
| Alaska | $4,445–$8,254 | 123% | Likely |
| Arizona | $3,732–$6,931 | 90% | Likely |
| Arkansas | $3,473–$6,450 | 78% | Likely |
| California | $4,380–$8,134 | 120% | Likely |
| Colorado | $3,970–$7,372 | 101% | Likely |
| Connecticut | $4,056–$7,532 | 105% | Likely |
| Delaware | $3,862–$7,172 | 96% | Likely |
| Florida | $3,516–$6,530 | 80% | Likely |
| Georgia | $3,451–$6,410 | 77% | Likely |
| Hawaii | $4,660–$8,655 | 133% | Likely |
| Idaho | $3,624–$6,731 | 85% | Likely |
| Illinois | $4,423–$8,214 | 122% | Likely |
| Indiana | $3,926–$7,292 | 99% | Likely |
| Iowa | $3,689–$6,851 | 88% | Likely |
| Kansas | $3,754–$6,971 | 91% | Likely |
| Kentucky | $3,603–$6,691 | 84% | Likely |
| Louisiana | $3,495–$6,490 | 79% | Likely |
| Maine | $3,862–$7,172 | 96% | Likely |
| Maryland | $4,056–$7,532 | 105% | Likely |
| Massachusetts | $4,401–$8,174 | 121% | Likely |
| Michigan | $3,840–$7,132 | 95% | Likely |
| Minnesota | $4,099–$7,613 | 107% | Likely |
| Mississippi | $3,408–$6,330 | 75% | Likely |
| Missouri | $3,926–$7,292 | 99% | Likely |
| Montana | $3,754–$6,971 | 91% | Likely |
| Nebraska | $3,603–$6,691 | 84% | Likely |
| Nevada | $4,078–$7,573 | 106% | Likely |
| New Hampshire | $3,905–$7,252 | 98% | Likely |
| New Jersey | $4,164–$7,733 | 110% | Likely |
| New Mexico | $3,689–$6,851 | 88% | Likely |
| New York | $4,293–$7,973 | 116% | Likely |
| North Carolina | $3,451–$6,410 | 77% | Likely |
| North Dakota | $3,689–$6,851 | 88% | Likely |
| Ohio | $3,840–$7,132 | 95% | Likely |
| Oklahoma | $3,430–$6,370 | 76% | Likely |
| Oregon | $4,121–$7,653 | 108% | Likely |
| Pennsylvania | $3,862–$7,172 | 96% | Likely |
| Rhode Island | $3,905–$7,252 | 98% | Likely |
| South Carolina | $3,603–$6,691 | 84% | Likely |
| South Dakota | $3,473–$6,450 | 78% | Likely |
| Tennessee | $3,559–$6,610 | 82% | Likely |
| Texas | $3,473–$6,450 | 78% | Likely |
| Utah | $3,603–$6,691 | 84% | Likely |
| Vermont | $3,818–$7,091 | 94% | Likely |
| Virginia | $3,603–$6,691 | 84% | Likely |
| Washington | $4,401–$8,174 | 121% | Likely |
| West Virginia | $3,451–$6,410 | 77% | Likely |
| Wisconsin | $3,926–$7,292 | 99% | Likely |
| Wyoming | $3,732–$6,931 | 90% | Likely |
Common questions
How much does a retaining wall cost?
A retaining wall typically runs about $20–$50 per square foot of wall face installed, so a mid-grade 40 ft × 4 ft segmental block wall lands around $4,500–$7,000. Timber and interlocking landscape block are cheaper; poured concrete and natural stone run to $60 per square foot or more. Use the calculator above for a range matched to your length, height, and material.
Do I need a permit and engineering?
In most jurisdictions a retaining wall taller than about 3–4 feet (measured from the bottom of the footing) requires a permit, and stamped engineered drawings are commonly required above that height or where the wall carries a surcharge like a driveway. Shorter garden walls usually don't. Always confirm with your local building department.
Why is drainage a separate line?
Water is what fails retaining walls. A proper wall includes free-draining gravel backfill, a perforated drain pipe at the base, and weep outlets so hydrostatic pressure can't build behind it. That drainage system is priced per linear foot of wall and is worth keeping in the estimate — leaving it out is the most common cause of a bulging or failed wall.