Retaining Walls
Retaining Walls
Walls that hold ground back, not walls that lean.
A retaining wall is a structural element, not a landscaping feature, and that distinction is why so many of them fail. Soil pushing against a wall exerts enormous pressure — and saturated Kentucky clay pushes considerably harder than dry soil does.
Drainage is the whole job
Nearly every failed retaining wall we are called to look at failed for the same reason: water built up behind it with nowhere to go. Saturated soil is heavier and exerts far more pressure than drained soil, and Central Kentucky clay holds water beautifully.
A wall built correctly has gravel backfill behind the face, a perforated drain at the base carrying water out to daylight, and geotextile keeping soil from clogging the gravel. None of that is visible when the job is finished, which is exactly why it gets skipped.
Materials we build in
- Natural limestone — the Bluegrass look, and it ages beautifully
- Segmental block systems — engineered, consistent, cost-effective for height
- Poured concrete with stone veneer where a specific look is required
- Boulder walls for a naturalistic, larger-scale application
- Timber, where the budget demands it — with an honest warning about its lifespan
Height changes the rules
Above a certain height a retaining wall generally requires engineering and a permit, and that threshold is set by the jurisdiction. Tall walls may also need geogrid reinforcement extending back into the retained soil, which means the excavation is far larger than the wall face suggests.
Building two shorter terraced walls instead of one tall one is often cheaper, better looking, and structurally simpler — provided they are spaced far enough apart that the upper wall is not loading the lower one.
Signs an existing wall is failing
- Leaning outward at the top, or bulging in the middle
- Blocks or stones separating at the joints
- Soil or mulch washing through the wall face
- Cracking in a poured or mortared wall, particularly stepped cracking
- Standing water behind the wall after rain, or no visible outlet for drainage
- Settlement or sinking in the ground above it
Common questions
For region-specific guidance, the Fayette County Cooperative Extension Service publishes local horticulture and home-maintenance resources for property owners here.
Do I need a permit for a retaining wall?
Above a certain height, generally yes, and engineering may be required as well. The threshold is set locally, so we confirm with the jurisdiction rather than assuming.
Why did my old wall lean?
Almost always drainage, sometimes an inadequate base. Water builds behind the wall, the pressure increases, and the wall rotates out at the top. A wall built without a drain will eventually do this regardless of how good the stonework looks.
Can a leaning wall be fixed without rebuilding?
Occasionally, if movement is minor and the base is intact. More often the wall has to come apart so the drainage that was never installed can go in. We will tell you which situation you have.
One tall wall or two short ones?
Two terraced walls are frequently cheaper and structurally simpler, provided they are spaced so the upper one is not surcharging the lower. It usually looks better too.
Related: hardscapes · dry stone fences · cost guide – retaining wall cost · is my wall bowing? · is fall the best time to build?. Back to Lexington Masonry Pros.
Lexington Masonry Pros · Serving Lexington, Nicholasville, Georgetown, Versailles & Fayette County, KY · Call or text (859) 310-1209
Last updated August 2026