Cobb County walls and drainage
Retaining wall contractors in Marietta, GA
Block, stone and timber retaining walls, wall repair, and the drainage behind them, for homes across Marietta and Cobb County. Tell us about the slope and you get a free written quote from a local crew.
The problem
Red clay holds water. Water pushes walls over.
Marietta sits on Georgia Piedmont clay and gets about 50 inches of rain a year. On a sloped lot, that water soaks into the clay behind a wall, gets heavy, and pushes. That is why so many walls around Cobb County bow, crack or lean after a few wet seasons.
Walls built for the slope you have
Height, soil and what sits above the wall decide the design, not a one size fits all block count.
Drainage is part of the wall
Gravel backfill, filter fabric and a perforated pipe that daylights downhill are in the quote, not an upsell.
A straight answer on permits
Walls over 4 feet, or walls holding up a driveway or slope, usually need engineered plans. You hear that up front.
Services
Walls first, with the drainage that keeps them standing
Segmental block walls
The most common residential wall. Interlocking units, clean lines, long life.
Block walls STONENatural stone and boulder
Dry stacked fieldstone or boulders for garden walls and terraced beds.
Stone walls REPAIRLeaning wall repair
Bulging block, rotted timber, washed out bases. Repair or rebuild, explained plainly.
Wall repair DRAINAGEFrench drains and yard drainage
Soggy lawns, water at the foundation, downspouts dumping at the house.
DrainageTypical prices
How much does a retaining wall cost in Marietta?
Retaining walls are priced per square foot of wall face: length times exposed height. These are typical installed ranges from published 2026 cost guides, not our quotes. Height, access and drainage move the number.
$3,000 to $9,600
Typical installed range for a common block or timber wall that size.
- Treated timberBudget walls, shorter life in wet soil$20 to $50 / sq ft
- Concrete landscape blockLow walls under code limits$30 to $75 / sq ft
- Segmental retaining wall blockTaller walls with geogrid$40 to $90 / sq ft
- Natural stoneGarden walls and premium looks$45 to $110 / sq ft
- Poured concreteStructural walls, tight spaces$60 to $120+ / sq ft
- Engineer for walls over 4 ftDesign and stamped plans$350 to $750
Sources: LawnStarter retaining wall cost guide (2026); engineering from Angi retaining wall cost (2026). Typical ranges, not quotes.
How it works
Three steps to a written price
No call center, no pressure. Photos help a lot.
Tell us about the yard
Use the short quote form. Wall length, rough height, and what the water is doing are enough to start.
Site visit and measurements
A local crew looks at the slope, soil, access and where water can drain, and checks whether a permit applies.
Written quote
Materials, drainage, base prep, haul off and timeline in writing. You decide with no obligation.
FAQ
Retaining wall questions from Marietta homeowners
How much does a retaining wall cost in Marietta?
Most walls are priced per square foot of wall face, which is the length times the exposed height. Typical installed ranges run about $20 to $50 per square foot for treated timber, $30 to $90 for concrete block, and $45 to $110 for natural stone, according to LawnStarter's 2026 cost guide. A common 40 foot long, 3 foot tall wall often lands between $3,000 and $9,600. Your written quote after a site visit is the real number.
Do I need a permit for a retaining wall in Cobb County?
In unincorporated Cobb County, a wall over 4 feet tall, or any wall holding up a driveway, a building, or a slope, generally needs a building permit and plans stamped by a Georgia licensed professional engineer. Marietta, Kennesaw, Smyrna and the other cities set their own rules, so the permit question gets checked for your address before work starts.
Why do retaining walls lean or fail?
Almost always water. When rain soaks the clay behind a wall and has no way out, the pressure pushes the wall forward. Gravel backfill, a perforated drain pipe at the base, a compacted gravel base, and geogrid on taller walls are what keep a wall standing.
Should I build with block, stone or timber?
Concrete block is the most common choice because it is predictable and lasts for decades. Natural stone looks best but costs more in skilled labor. Treated timber is cheapest up front but has the shortest life in wet soil, often 15 to 25 years.
Can a leaning or cracked wall be repaired?
Often, yes. Angi's 2026 data puts typical retaining wall repairs at $450 to $950. A wall that has shifted at its base may need a section rebuilt, and full rebuilds commonly run $6,000 to $14,500.
Do you also fix yard drainage and soggy lawns?
Yes. French drains, catch basins, underground downspout lines and regrading are covered on the drainage page. Wall and drainage work are often quoted together, since a wall without drainage is the most common reason walls fail.
What areas do you serve?
Marietta, East Cobb, Kennesaw, Smyrna, Powder Springs, Acworth, Austell, Mableton and Vinings. See service areas for details.
Is the quote free?
Yes. Send the request, a local contractor follows up to see the site, and you get a written price. There is no cost and no obligation to book.
Get a free retaining wall or drainage quote
Tell us what the yard is doing. A local crew follows up to look at the site and gives you a written price. No cost, no obligation.