Concrete Retaining Walls in Kansas City

If you've spent time in Johnson County, Lee's Summit, or virtually any of KC's older residential neighborhoods, you've seen retaining walls everywhere. The Missouri and Kansas sides of the metro are defined by rolling terrain — beautiful to look at, but a challenge when you're trying to create usable outdoor space on a sloped lot. Retaining walls solve that problem by holding back soil, managing water runoff, and creating flat areas for patios, gardens, driveways, and play areas.

The three most common types are segmental retaining wall block (brands like Allan Block and Versa-Lok), poured concrete, and concrete masonry unit (CMU) block walls. Segmental block is the most common for residential projects under 4 feet — it's relatively affordable, has a natural look, and doesn't require forms or curing time. Poured concrete walls are stronger and better for taller or more heavily loaded applications. CMU block is common in commercial settings and for basement-level walls. For decorative applications, stamped or textured concrete walls can match your patio or home's exterior.

Here's what most homeowners don't know: in virtually every KC-area municipality — Overland Park, Olathe, Shawnee, Lee's Summit, Kansas City proper — retaining walls over 4 feet in height require a building permit and engineered drawings stamped by a licensed structural engineer. This isn't bureaucratic overhead; it's because a wall failure on a loaded slope is a serious safety and liability event. We handle all permitting and work with licensed engineers on any wall that requires it. Don't hire a contractor who builds over 4 feet without pulling permits.

Drainage is the single most important factor in retaining wall longevity. Ninety percent of wall failures aren't structural — they're drainage failures. Hydrostatic pressure from water saturating the soil behind a wall will eventually overwhelm any wall that doesn't have proper drainage. Every wall we build includes a gravel drainage aggregate layer behind the wall, a perforated drain pipe at the footing, and weep holes at the base to let water escape before it builds pressure. If your existing wall is leaning or showing signs of movement, drainage failure is the most likely cause.