Retaining Walls in Clark County, WA
Segmental block, natural stone and boulder walls engineered to hold Clark County grades and drain properly behind the face.
Get a Free EstimateA retaining wall is a structure, not decoration. It is holding back tons of saturated clay, and in this climate that clay is saturated for six months of the year. The walls that fail around here almost always fail for the same reason: nobody dealt with the water behind them.
Drainage is the whole job
Behind every wall we build there is a column of clean drain rock, wrapped in filter fabric so the surrounding soil cannot silt it up, with a perforated pipe at the base daylighted to somewhere the water can actually go. Without that, hydrostatic pressure builds behind the wall until it leans, bulges and eventually comes apart.
The base is just as important. We dig below the frost line onto undisturbed soil, put down compacted crushed rock, and bury the first course. A wall that starts level and buried stays straight; one that starts on topsoil does not.
Height, engineering and permits
Once a wall gets tall, or is holding up a driveway, a structure or a slope above it, it typically needs engineering and a permit. In most Washington jurisdictions the trigger is around four feet measured from the bottom of the footing to the top of the wall, and surcharge loads can pull that threshold lower.
We will tell you honestly which side of that line your project falls on. If it needs an engineer, we will say so rather than quietly building something undersized — and on taller walls we install geogrid reinforcement back into the retained soil at the spacing the design calls for. Confirm the specifics with your local building department, since requirements vary between the county, Vancouver, Camas and the smaller cities.
Wall types we build
Segmental concrete block for clean, uniform lines and predictable engineering. Natural rock and boulder walls when the look should read as part of the landscape. Terraced walls to break a tall grade into two shorter, cheaper structures with planting space between. Seat walls, planter walls and steps integrated into patios.
What is included
- Compacted crushed rock footing on undisturbed soil
- Buried base course for stability
- Clean drain rock and filter fabric behind the full face
- Perforated drain pipe daylighted to a real outlet
- Geogrid soil reinforcement where the design requires it
- Honest guidance on when an engineer and permit are needed
Every quote is fixed and in writing. We walk the site, tell you what the job actually needs, and price it. If we find something during the walkthrough that changes the scope, you hear it then — not as a change order halfway through.
Retaining Walls: common questions
How tall can a retaining wall be without a permit?
The common threshold across Washington jurisdictions is about four feet, measured from the bottom of the footing to the top of the wall — but if the wall carries a surcharge such as a driveway, a slope or a structure above it, engineering is usually required at a lower height. Requirements differ between Clark County and individual cities, so always confirm with the building department that covers your address.
Why is my existing wall leaning?
Nine times out of ten it is water. If there is no drain rock and pipe behind the wall, saturated clay pushes against the back of it every winter and the wall slowly rotates forward. The other common causes are a footing set on soft or uncompacted soil and a missing buried base course. A leaning wall does not correct itself and gets more expensive the longer it sits.
Can you build a wall against my property line?
Often yes, but setbacks, easements and the drainage outlet all need checking first, and the excavation behind a wall usually needs more room than people expect. If the wall would affect a neighbor’s grade we will raise it before we quote.
Block or natural rock?
Block gives you straight, uniform lines, predictable engineering and a lower cost per square foot of face. Boulder walls look softer and more natural and suit rural and wooded properties, but they need machine access and take up more depth. We build both and will show you photos of each from local jobs.
Retaining Walls by city
Local conditions change what this job takes. Pick your area for the specifics.
Need retaining walls?
Free on-site estimates across Clark County. We walk the property with you, tell you what it actually needs, and put a fixed price in writing.