Concrete contractor in Walnut Creek, CA - slabs built to shed water on sloped lots
Alliance Walnut Creek Concrete Company is a concrete contractor based in Walnut Creek, CA. We build driveways, patios, steps and retaining walls here, and we're known for the awkward ones, like sloped backyards and cuts through old slabs.
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Walnut Creek's hillsides shape our concrete work
Walnut Creek runs from a busy downtown out to quiet residential streets, and some neighborhoods back right up to Shell Ridge, the open space that starts a short way from downtown and climbs all the way to Mount Diablo. On the flatter streets we meet older single-story homes still on their original driveways, and up in the hills we meet newer houses where the backyard steps up or drops away. Most of what we do here is flatwork, the ground-level slabs like driveways, patios and walks, along with the walls and steps that let a sloped yard hold a patio at all.
It's a lot like what we see next door in Lafayette, where plenty of lots have their own grade, so we start every job by working out which way the water wants to run before we talk about finishes.
What we've learned working in Walnut Creek
Inside the city limits, permits come from the city's Community Development Department, and Walnut Creek requires a building permit when you add a structure or physically change your property. I check early whether your job touches the street or needs that sign-off, because the schedule hangs on it along with the curing wait, and when a permit is needed we can handle the application and paperwork for you. Beyond that, your price moves with the size of the area, how much old concrete comes out, how deep we dig and pack the base and what the slope and drainage call for, and you'll see all of it in the written estimate.
We're licensed and insured, in business since 2013, and we work out of Walnut Creek and take jobs in the cities around it, like Concord and Pleasant Hill. Over the line, that city's rules apply instead of Walnut Creek's, so one of my first questions is which side of the city limit your house sits on.
What do concrete slabs in Walnut Creek need most?
On a sloped lot, water coming down the hill finds the lowest spot, and too often that's the edge of a patio or a driveway that falls back toward the garage. Puddles against the house and a soft subgrade, the ground the slab sits on, are what lead to sinking and cracks a few years in, so I ask where it pools when it rains and we set the slab to fall away from the house, with a drain, a swale or a wall to carry the water off.
Big trees are the other thing we plan around. The city protects any tree, dead or alive, that measures 9 inches or more at 54 inches above the ground, and only the City Arborist can approve taking one out, so when roots have lifted an old driveway we work the new base and forms around them instead of assuming the tree can go.
- Call (925) 448-9528
- Mon–Sun: 8 AM–9 PM
- Walnut Creek, CA 94596
Concrete work we do in Walnut Creek
Concrete driveway building
Older driveways here often sink or crack because the base was only raked level. Our concrete driveway building starts with digging out and packing a real base.
Concrete retaining walls
Sloped yards need walls that hold soil and handle water. We build concrete walls with drainage behind them, so a patio fits where the hill used to be.
Concrete patio construction
Patios here often sit on a slope or tight against a back door. We set each one to fall away from the house so water runs off, not in.
Concrete steps construction
Homes set into the hills often have front steps that settle and tilt. We rebuild them on solid footings with even risers that feel right underfoot.
Concrete sidewalk building
Front walks get lifted by roots from the mature trees on many lots here. We replace them with a broom finish, a light texture for grip when wet.
Concrete cutting
Older slabs often stand in the way of a new drain line or a wider driveway. We saw-cut clean edges, removing only what has to go.
How it works when you call us in Walnut Creek
Call us or send the form
Call (925) 448-9528 or use the form, and I'll call you back to talk through the job. We'll set a time for me to come out and see it.
I walk the site with you
I come out myself, look at the slope, the old slab and where the water goes, and ask a lot of questions about what you have in mind. Then I put the whole job in writing, so you see the full number before you commit to anything.
We handle paperwork and marking
Once you're ready, we take care of the paperwork, any permit and the marking or scanning of what's underground, then set the pour date. Inside the city, Saturday or City Holiday work needs an after-hours permit and none is allowed on national holidays like Thanksgiving, so we plan around that.
We prep, pour and walk it
Our crew digs out and packs the base, pours and finishes, and I'm on site for the parts that matter most. At the end I walk the job with you and go over curing, the wait before the slab is ready for feet and tires, and how to look after it.
Get a free written estimate for your Walnut Creek project
We reply within one business day, and I'm usually the one who calls you back about your Walnut Creek job. I'll set a time to walk the site, ask what you have in mind and put it all in writing, with no pressure and no obligation. Backed by our satisfaction guarantee.
- Licensed and insured.
- Phone
- (925) 448-9528
- Location
- Walnut Creek, CA 94596
- Hours
- Mon–Sun: 8 AM–9 PM
Questions about concrete work in Walnut Creek
Do I need a permit to replace my driveway apron or sidewalk in Walnut Creek?
Yes, the city requires an Encroachment Permit to replace the driveway approach, the stretch that meets the street, or the sidewalk in front of your property. We sort that permit out before we set a pour date, and we can handle the application for you.
How do I apply for a concrete permit in Walnut Creek?
You apply through the city's Online Permit Portal, because Walnut Creek no longer takes paper or emailed applications. Before a permit is issued, the legal property owner or a California licensed contractor has to sign for it, and when your job needs one we can handle the application and paperwork.
Does a concrete retaining wall need a permit in Walnut Creek?
It does if the wall is taller than 4 feet measured from the bottom of the footing, holds back more than 3 feet of soil, or carries a surcharge, which is extra weight above it like a driveway or a slope. Hillside yards often put that kind of load on a wall, so I measure and look uphill at the estimate, and you can check sizes in the city's building permit FAQs or with city building staff.
How much does a new concrete driveway cost in Walnut Creek?
Your price comes from the driveway's size, how much old concrete we break out and haul away, how deep the base has to go and whether the approach at the street needs a permit. Stamped or colored finishes add to it, and if the budget's tight I'd trim the finish before the base, because the base is hidden on day one but decides whether the slab settles. I'll put your number in writing after I walk it.
What causes concrete driveways to crack and sink in Walnut Creek?
Most of the cracking and sinking we see comes from a base that was raked flat instead of dug out and packed, water running under the slab, roots pushing up from below and control joints cut late or skipped. Control joints are grooves we cut on purpose so the slab cracks in a straight line where we chose, and we add rebar, steel inside the slab that holds the pieces together, and pour early in the day so heat doesn't leave a weak, dusty top.
Will Walnut Creek's proposed flood rule affect a new slab foundation?
It could if your lot is in a flood hazard area, because a proposed city code amendment would set the lowest floor of new buildings at or above the base flood elevation plus 2 feet, or the design flood elevation, whichever is higher. It would also reach existing buildings under substantial improvement or repair of substantial damage, and since it's still a proposal, we check where it stands before we lay out a slab foundation.
Tell us about your Walnut Creek concrete project
The earlier I see your sloped yard or old slab, the more time we have to work out the tricky spot instead of guessing on pour day.
Request an estimateCall (925) 448-9528