Retaining wall construction in Napa CA - a wall that drains and holds your slope
Who can build a retaining wall on my property in Napa?
Professional Napa Concrete and Masonry builds retaining walls in Napa and the cities around it, in block, poured concrete, brick and stone. I plan the drainage first, because water trapped behind a wall is what usually pushes it over, and I come out to look at every job myself.
Most calls start with something you've noticed, a slope that keeps sliding onto the patio or an old wall that's leaning, cracked or seeping mud at the bottom. A retaining wall holds back the weight of the soil behind it, so most of the job is the part you never see, the digging, the footing, the steel and the gravel behind the wall.
The price moves with the wall's height and length, the material and how hard the dig is, and the schedule mostly depends on height, because a taller wall has more to settle before we break ground. After I look it over, you get a written estimate that spells out the work and the reason for it.
Not every leaning wall has to come down. If an old brick or stone wall is mostly sound, masonry restoration can sometimes save it, and I'll tell you plainly when that's the better call. If the wall is part of a bigger backyard plan, we can talk through fireplace installation on the same visit so the new work looks like it belongs to your house.
What the job takes
- Checking the slope and what it holds
- Digging out to firm ground
- A footing sized for the wall
- Reinforcement where the wall needs it
- Gravel backfill and a drain behind it
- Clear outlets so water gets out
What to weigh before building a retaining wall
What adds to the price
Beyond the basics, tearing out an old wall, stepping it into terraces, curving it or adding decorative concrete each add to the price, and your estimate shows each one.
What sets the timing
Design and paperwork come first on a taller wall, and the dig waits on them. Once we start, weather and how easily we can get equipment to the spot set the pace.
Plain block or a matching face
Block can stay plain or get a stone or brick face to match your house. Facing adds cost, but on a wall you see every day it's usually worth it.
Retaining wall questions from Napa
How much does a retaining wall cost near Napa?
Retaining wall construction in the Bay Area usually costs about $50 to $65 per square foot. For a poured concrete wall, that rate usually covers site prep, excavation, concrete, reinforcement and gravel backfill, and the extras mentioned above, like terracing or curves, come on top. It's a Bay Area market figure, not our price, so your written estimate is the number to go by.
Does my retaining wall in Napa need a permit?
The city's Building Division issues permits for retaining walls over 4 feet tall, measured from the bottom of the footing, or walls holding up extra load. A city handout that isn't dated is stricter, because it counts exposed height, exempts only concrete, masonry and block walls retaining up to 36 inches of earth and treated wood up to 24 inches, and adds a slope beside the wall, an attached solid fence, or buildings, roads or vehicles above it as triggers. Since the two don't match, ask the Building Division which standard applies to your wall. We're fully licensed and insured, we check with the city early, and when your wall needs a permit we take care of the application and set up the inspections.
What if my Napa property is in a seismic hazard zone?
Plan on extra care, because the state says a property inside a mapped Seismic Hazard Zone likely has weak soil or rock beneath it that can fail in an earthquake, so grading and building there call for proper precautions. A retaining wall means cutting into that ground, so on hillside jobs I look closely at the soil and the slope before I price the wall.
What causes a retaining wall to fail?
Water trapped behind the wall usually does it. A national construction field guide says backfill that drains poorly, or no clear path for water to escape, greatly raises the odds of failure, and suggests asking each builder how the wall gets sand or gravel backfill and drains that let water out. Drainage is the first thing I plan, so ask me that same question.
How do I know if my retaining wall needs an engineer?
A national construction field guide advises having a qualified engineer design block walls higher than 5 feet, so if you're planning a tall wall, it helps to line up that design before building starts. I'll tell you up front when your wall should have one, rather than letting you find out halfway through the dig.
Is a block retaining wall better than a wood one?
For most yards, yes, because a concrete masonry trade group's manual says block resists cracking and, unlike treated timbers or railroad ties, doesn't splinter or decay. A timber crib wall, where soil packed inside a frame of ties holds back the slope, can work, but the wood has to be treated against rot, so on most jobs I'd steer you to block.
Retaining wall construction near you
We're based in Napa and build retaining walls in the cities around it, including American Canyon and Sonoma. Pick your area, or call if you're not sure we come out your way.
Other masonry work
Get a free retaining wall estimate
Send the wall's height and length, the slope above it and any attached fence. We reply within one business day, then I come out for a free, no-obligation estimate.