What Does a Retaining Wall Cost?
A retaining wall costs $40 to $345 per linear foot, averaging around $150 per linear foot for a typical residential installation. Material and wall height are the two variables that decide where you land, and height matters more than most homeowners expect.
| Wall type | Cost per linear foot |
|---|---|
| Treated timber | $25 to $50 |
| Segmental concrete block (up to 3 to 4 feet) | $40 to $80 |
| Poured concrete | $50 to $100 |
| Dry-stacked natural stone | $100 to $200 |
| Mortared natural stone | $150 to $250 |
| Tall or engineered wall (over 4 feet) | $150 to $345 |
| Drainage aggregate behind the wall | $10 to $20 |
| Excavation and disposal of the retained area | $10 to $30 |
Block and Poured Concrete: $40 to $100 per Linear Foot
Segmental concrete block from manufacturers such as Allan Block and Versa-Lok runs $40 to $80 per linear foot for a wall up to 3 to 4 feet tall. The interlocking blocks stack without mortar, held in place by their own design and the weight of the soil behind them. They come in a range of styles and colors, install quickly, and are the most commonly built residential retaining wall. Small block walls are within reach of an experienced DIYer. A 20-linear-foot block wall at 3 feet tall runs $800 to $1,600 installed professionally.
Poured concrete runs $50 to $100 per linear foot. Treated timber is cheaper still at $25 to $50 per linear foot, but it has a much shorter service life than masonry and is not appropriate for walls over 4 feet.
Natural Stone: $100 to $250 per Linear Foot
Dry-stacked natural stone, meaning fieldstone, granite, or limestone laid without mortar in an interlocking pattern, runs $100 to $200 per linear foot. Mortared stone, laid in mortar for a more formal and permanent look, runs $150 to $250 per linear foot. A 20-linear-foot dry-stacked stone wall at 2 feet tall runs $2,000 to $4,000 installed.
Stone gives a variation and character that manufactured block cannot fully replicate, and it integrates into a natural landscape better than anything else. The premium covers both the material and the skilled labor: a stone wall needs a real mason, because a poorly laid one is structurally unstable, not just unattractive.
Tall and Engineered Walls: $150 to $345 per Linear Foot
A wall over 4 feet tall, or any wall holding back substantial soil or supporting a heavy load, runs $150 to $345 per linear foot. Most jurisdictions require an engineer’s stamp for residential retaining walls over 4 feet, and some set the threshold at 3 feet. A 20-linear-foot engineered block wall at 5 to 6 feet runs $3,000 to $7,000 installed.
The premium is not just more material. It covers the engineering fee, a deeper footing, geogrid reinforcement layers for segmental block walls over 4 feet, deadman anchors, and a more substantial drainage system. Soil and water pressure rise sharply with height, so a tall wall is structurally a different object than a short one, and its cost per linear foot is much higher even in the same material.
That threshold effect is worth planning around. Below it you can choose an economical material and keep the project simple. Above it, engineering, permits, and reinforcement stop being optional. If your slope allows any flexibility, terracing it with two shorter walls instead of one tall one can keep the project under the threshold entirely and change the budget substantially.
Drainage, Permits, and Lifespan
Drainage aggregate behind the wall costs $10 to $20 per linear foot and is required on every retaining wall over 18 inches tall. Do not treat it as an upgrade. Hydrostatic pressure from saturated soil behind the wall is the primary cause of retaining wall failure, and a wall without proper drainage will fail early regardless of material or how well it was built. Excavation and disposal of the retained area adds $10 to $30 per linear foot, and steps integrated into the wall add $200 to $600 per step section.
A building permit is required in most jurisdictions for a wall over 3 to 4 feet, though the exact threshold varies. A wall near a property line may need setback confirmation, and a wall in a flood zone carries additional regulatory requirements. An engineer designs the wall to the actual soil load, which depends on height, soil type, drainage conditions, and any surcharge, meaning added load above the wall from a driveway or structure. Call the local building department before planning any wall over 3 feet.
With proper drainage, concrete block and poured concrete walls last 50 years or more. Dry-stacked stone lasts 50 to 100 years or more. Mortared stone lasts 30 to 50 years before the joints need repointing. Treated timber lasts 15 to 25 years before rot forces replacement.
Getting an Accurate Quote
Site conditions move retaining wall pricing as much as material does: slope, soil type, access for equipment, and drainage requirements all feed into the number, along with local labor rates. A short block wall on an easy site sits at the bottom of the range; a tall engineered wall on a difficult site runs to the top.
Get at least two written quotes on the same defined scope. Confirm that each one includes drainage aggregate and its depth, excavation and disposal, any engineering and permit fees, and the base preparation specification, since those are the line items a thin bid quietly omits. Ask what the labor warranty covers, verify general liability insurance, get the scope in writing, and tie payments to milestones rather than paying upfront.
Frequently Asked Questions
$40 to $345 per linear foot, averaging $150. Segmental concrete block runs $40 to $80, poured concrete $50 to $100, natural stone $100 to $250, and tall or engineered walls over 4 feet $150 to $345. A 20-foot block wall at 3 feet tall costs $800 to $1,600 installed.
Treated timber at $25 to $50 per linear foot is the lowest cost, but it lasts only 15 to 25 years and is not appropriate above 4 feet. Segmental concrete block at $40 to $80 per linear foot is the least expensive durable option: interlocking blocks that stack without mortar, available in many styles and colors, and quick to install.
$100 to $200 per linear foot dry-stacked, or $150 to $250 per linear foot mortared. A 20-linear-foot dry-stacked wall at 2 feet tall runs $2,000 to $4,000 installed. The premium covers both the material and the skilled mason the work requires, since a poorly laid stone wall is structurally unstable.
$150 to $345 per linear foot for a wall over 4 feet or one holding a heavy load. A 20-linear-foot engineered block wall at 5 to 6 feet runs $3,000 to $7,000 installed. The cost covers the engineering fee, a deeper footing, geogrid reinforcement, deadman anchors, and a more substantial drainage system.
Most jurisdictions require an engineer's stamp for residential retaining walls over 4 feet, and some set the threshold at 3 feet. The engineer designs the wall for the specific soil load, which depends on height, soil type, drainage conditions, and any surcharge such as a driveway or structure above the wall. Check with the local building department before planning a wall over 3 feet.
A building permit is required in most jurisdictions for walls over 3 to 4 feet, with the exact threshold varying by locality. A wall near a property line may require setback confirmation, and a wall in a flood zone carries additional regulatory requirements. Contact the local building department before starting any wall over 3 feet.
Because hydrostatic pressure from saturated soil behind the wall is the primary cause of retaining wall failure. Drainage aggregate costs $10 to $20 per linear foot and is required on every wall over 18 inches. A wall built without it will fail early no matter what material it is made of or how well it was assembled.
With proper drainage, concrete block and poured concrete last 50 years or more, dry-stacked natural stone 50 to 100 years or more, and mortared stone 30 to 50 years before the joints need repointing. Treated timber lasts 15 to 25 years before rot requires replacement. Drainage is the single biggest factor in longevity for every material.