Overview: Retaining Wall Contractors
A retaining wall holds a slope in place. That is structural work, whatever it looks like from the street. Everything that decides whether it lasts is buried. Under the wall sits a trench cut below the topsoil and compacted hard. Behind it go a column of clean stone, a perforated pipe carrying water out to daylight, and layers of geogrid reaching back into the hill.
Walls fail for one reason more than all the others put together. Wet soil that cannot drain pushes, and the wall answers by leaning out at the top, bulging in the middle or cracking in a staircase pattern. Backfilling with the same dirt that came out of the hole is the shortcut that guarantees it, and it is invisible the day the job is finished.
Height changes what the job is. Above the height your local code names, a permit and an engineered design are required. Any wall holding up a driveway, a parking pad or another slope needs that design whatever its height, because the load above is a surcharge the wall has to resist.
Each listing repeats what the company publishes about itself and its hours, alongside lines from public reviews. Work through the state list, then your city page.
Cost of Retaining Walls
Start with wall length, exposed height and the loads above it. Compare a complete design with drainage and excavation; a low wall-face price can omit work that determines whether the wall performs properly.
| Service or scope | Planning range | What this covers |
|---|---|---|
| Segmental block retaining wall | $20–$50per sq ft of exposed wall face | Build a low residential segmental-block wall with the required base, drainage and reinforcement stated in the design.Height, surcharge loads and access can move the price substantially. Obtain a project design before relying on an area rate.Included scope and possible extrasScope used for this estimate: Specified base and wall units; Drainage aggregate and outlet; Caps Outside this estimate: Engineering fees; Old wall removal; Unsuitable-soil replacement |
| Poured concrete retaining wall | $20–$45per sq ft of exposed wall face | Build a poured reinforced-concrete retaining wall to a site-specific design, with base and drainage scope stated.Footing size, reinforcement, finish, height and excavation determine the full quote.Included scope and possible extrasScope used for this estimate: Specified footing and reinforcement; Wall construction; Specified drainage Outside this estimate: Design and permits unless expressly included; Decorative facing; Difficult access equipment |
| Natural stone retaining wall | $20–$100per sq ft of exposed wall face | Build a residential natural-stone retaining wall with the stone, stacking or mortaring method, base and drainage specified.Stone type and construction method cause a wide range. Compare the same stone, height and structural design.Included scope and possible extrasScope used for this estimate: Stone and construction; Specified base; Drainage Outside this estimate: Premium stone selection; Design fees; Old wall demolition |
| Timber retaining wall | $15–$40per sq ft of exposed wall face | Build a residential treated-timber retaining wall with the anchoring, base and drainage required by the design.Ask about material treatment, anchors and drainage. Removal of a failed wall and slope stabilization are separate.Included scope and possible extrasScope used for this estimate: Timber construction; Specified anchors; Drainage Outside this estimate: Demolition; Design fees; Unexpected soil remediation |
What changes the price
- Exposed and total height, slopes and loads above the wall
- Soil, drainage discharge and excavation access
- Wall system, reinforcement and design requirements
Ask before you book
- Is the measured area the exposed face, and how are buried courses and caps priced?Prevents comparing different wall-area definitions.
- Does the quote include drainage, reinforcement, excavation and spoil removal?The cheapest visible wall can omit essential project components.
- What engineering or permits apply to this exact height, slope and loading?Requirements depend on the project and jurisdiction.
Check the scope
Price per square foot refers to wall-face area, not yard area. Wall height alone does not determine the design or permit requirements.
Compare quotes wisely
Compare material alternatives using the same design and drainage scope; ask separately about reusing suitable excavated material.
How to read these estimates
These ranges combine published U.S. prices and cost guidance for the stated work. They are budgeting estimates, not offers from listed companies or a statistical national average. Confirm the total, included work and additional charges in writing.
U.S. planning estimates. Local quotes vary by location and the scope of work.
Frequently asked questions
What goes in behind a properly built wall?
Stone, not soil. A band of clean angular gravel sits directly behind the blocks, with a perforated pipe at the bottom of it running out to a low point, and a geotextile fabric between that stone and the earth so fine material cannot wash in and clog it. Backfill goes in shallow lifts and every lift gets compacted. Leave any of this out and the wall is on a timer.
When does a wall need an engineer?
Once it passes the height your local code sets, once it carries a surcharge, which means a driveway, a pool, a parking area or another slope above it, and any time the soil is soft, wet or filled ground. An engineer sizes the base, the reinforcement and the drainage for your site rather than for a catalog, and the permit office will want the drawings stamped.
What is geogrid and do I need it?
Geogrid is a stiff mesh laid between courses of block and stretched back into the compacted fill behind the wall. It ties the wall and a wedge of the hillside into one mass, and that mass is what resists the push. A low wall on firm ground may not need it. A tall wall, or one with a load above it, always does, and it cannot be added afterwards.
Which material should the wall be built from?
Segmental block is the default, because it is engineered, repeatable and made to work with geogrid. Poured concrete suits tight spaces, odd shapes and tall walls, and it costs more. Boulders look right on a rural slope and need an operator who can actually place them. Treated timber is the cheapest to put up and the first thing you will replace, since it rots from the buried face outward.
Why is my old wall leaning or bulging?
Water behind it, nearly always, sometimes with a base that has settled underneath. A wall leaning out at the top, cracking in a staircase line, or letting soil wash through the joints has lost to the pressure built up behind it. Rebuilding usually beats patching, because the cause sits behind the wall and not on its face. Get it looked at before it moves further.
