Contractor Matching
Retaining Wall Contractor Matching in Ladue, MO
A sloped lot in Ladue or Frontenac usually needs more than a wall — it needs a plan for drainage, planting, and how the terrace will actually be used. Here's what to look for in a retaining wall partner and what the project typically involves.
What a Proper Retaining Wall Proposal Includes
- A drawn elevation showing wall height, batter, and any terracing
- A drainage detail — perforated pipe behind the wall daylighting somewhere specific, not just "gravel backfill"
- Confirmation of whether the wall height requires an engineer's stamp and permit in your specific municipality
- Material and finish (natural stone, segmental block, poured concrete) matched to the home's existing exterior
Why Drainage Is the Part That Actually Fails
Most retaining wall failures aren't a structural miscalculation — they're a drainage problem. Water trapped behind a wall with no way out builds hydrostatic pressure until the wall bows, cracks, or fully fails, often within a few wet seasons. Ask specifically where the drainage pipe daylights and how the backfill is specified before signing anything.
Typical Cost Ranges
A gravity wall under 3 feet typically runs $45–$75 per square face foot installed with natural stone. An engineered segmental wall with geogrid reinforcement for a taller slope generally runs $60–$110 per square face foot, reflecting the additional engineering, excavation, and reinforcement material.
Frequently Asked Questions
How tall can a retaining wall be before it needs an engineer?
Missouri municipalities commonly set the threshold around four feet of exposed height, though the exact number varies by jurisdiction — above that, a stamped engineering drawing is typically required before a permit is issued. Terraced walls (a series of shorter walls with planting between them) can often achieve the same total elevation change while staying under that threshold for each individual wall.
What's the difference between a gravity wall and an engineered segmental wall?
A gravity wall relies purely on its own mass and batter (backward lean) to resist the soil pressure behind it, and it's limited to shorter heights — typically under three to four feet. A segmental or engineered wall uses geogrid reinforcement extending back into the soil, which lets it safely retain much greater heights and loads, including a driveway or patio above it.
Design Consultation
Get Matched With a Retaining Wall Specialist
One intake form, matched to a licensed hardscape design-build contractor near you.
- 01 Written scope and fixed-price proposal before any deposit
- 02 No-obligation on-site design walkthrough
- 03 Licensed, bonded, insured design-build partners
- 04 Material and drainage plan included, not a lump sum