Retaining Wall FAQ
Raleigh and Lake Gaston NC
Do I need a permit or engineer to build a retaining wall?
1
It depends on the height and local building codes. In most municipalities, retaining walls over 4 feet tall (including the buried base layer) require structural engineering plans and a building permit. However, most retaining walls we build are 3 feet tall and do not require a permit. We also follow the manufacturer’s guidelines to ensure proper installation.
How do you prevent a retaining wall from leaning or failing over time?
2
The key to a long-lasting retaining wall is proper base preparation and construction. In our NC region with clay soil, walls typically fail due to poor footing construction. We build every wall with a concrete base and inspect every job site before building.
When would you recommend an edging stone vs a retaining wall?
3
It comes down to function and grade:
Choose Edging Stone for ground-level borders where your main goal is aesthetic separation. Edging stones create crisp lines between lawn, mulch, and gravel, keeping materials contained without supporting heavy weight. Typically edging stone is a max height of 6 inches.
Choose a Retaining Wall when you need structural support to hold back soil, prevent erosion, or manage a slope. Retaining walls can be built from various products and are between 1 to 3 feet high.
Can you repair an existing retaining wall?
4
In most cases, but it depends on the issue.
Minor Fixes: We can easily replace loose capstones, damaged wood, or cracked veneer.
Bowing or Leaning Walls: If the wall is leaning outward, it usually means poor drainage or soil pressure behind it. Fixing this requires digging out behind the wall, installing proper gravel drainage, and resetting the structure.
We will inspect your wall and let you know if a quick repair will work or if a rebuild is necessary for long-term function.
What materials do you use to build a retaining wall?
5
We build retaining walls using four primary materials, depending on your budget, structural needs, and aesthetic style:
Segmental Concrete Block Walls: Highly durable, interlocking engineered blocks designed specifically for earth retention. They are cost-effective, long-lasting, and ideal for creating smooth curves or managing significant grade changes.
CMU Block (8x8x16) with Veneer & Cap: Reinforced concrete masonry units (cinder blocks) stacked on a poured concrete footing, then faced with thin stone or brick veneer and finished with a custom wall cap.
Natural Stone Dry Stack: Natural stones that are shaped and stacked by hand with mortar. This creates a timeless, organic, rustic look.
Pressure-Treated Timber/Wood: A budget-friendly, natural option ideal for low-profile garden beds, terracing, or simple yard leveling.