Slab foundation building in Pomona CA - a slab built for the ground under it
Adding a garage or ADU and unsure what the ground will do? We start with the soil so the slab is built to stay level.
- Fully licensed and insured.
- Free quotes on site.
- We reply within 1 business day.
What does it take to build a slab foundation in Pomona?
Slab foundation building in Pomona means forming, pouring and finishing the flat concrete that a house, addition or garage sits on. The slab has to be designed to handle the way the soil under it moves with moisture while its top stays level. That's why we start with the ground, not the pour.
Most people call us when they're planning an addition, a garage or an ADU and want to know what they're in for. The price moves with the slab's size and thickness, how much digging and base work the ground needs, and how easy it is to get a truck to the spot. It also moves with how much rebar goes in, which is the steel inside the slab that keeps any crack from spreading apart. The schedule turns on the city's paperwork, what we find in the soil and the weather. Then there's curing, the days the concrete needs to stay damp and gain strength before anyone loads it. If the plan needs deeper supports at the edges, we handle those too with concrete footings, and the written estimate puts your own figure on all of it.
How do you know your slab or the ground under it needs attention?
Cracks across an old slab
If the slab under your garage, shed or old addition has cracks that keep widening, or pieces sitting higher than others, the ground under it has usually moved or the base was never packed right. If you build onto it or next to it without finding out why, the problem passes straight to the new concrete, and every rainy season lets more water into the gaps.
Dirt that cracks when dry
Some yards open up in deep cracks through summer and turn sticky after a rain, which usually means clay that swells and shrinks with water. That's no reason to skip the slab, but it is a reason to plan for that soil before anyone sets a form, because fixing a slab after it moves costs far more than planning for it.
Water sitting against the walls
Puddles that hang around the edge of the house, or a downspout that dumps right at the foundation, mean water is soaking the ground where your slab would sit. Left alone, that wet spot is usually where settling starts, so we sort out where the water goes as part of the job.
How we build a slab foundation
I want to know what kind of soil we're building on before we talk design. I ask about drainage and the planting around the slab too, because where the water goes and what grows near the edge matter as much as the concrete. Then we dig out to firm subgrade, which is the ground the slab actually sits on, and we bring in base material and pack it in layers instead of raking loose dirt flat. We set the forms and lay the vapor barrier, the plastic sheet that keeps ground moisture from wicking up into the floor, and any torn or loose spots get fixed before the truck shows up. We place the rebar and pour early in the day so the heat doesn't leave a weak, dusty top. Then we finish the surface and cut control joints, shallow grooves that give the concrete a straight place to crack instead of a random one, and let it cure. The base is where I won't cut corners. It's hidden on day one and it's the first thing people want to trim from a budget, but a nice finish on a bad base is still a bad slab.
Some slabs are only part of the job. If your plan calls for stem walls or a raised floor instead of a slab on grade, that's our foundation installation work, and I can tell you which suits the lot. Property managers and builders who need parking along with the building pad can roll it into one schedule with concrete parking lot building.
Slab for an addition or ADU
This suits homeowners adding living space, since the slab has to tie in level with the house and carry walls and finished floors. Here we spend the most care on the vapor barrier and on matching the height of the existing floor.
Slab for a garage, shop or shed
This suits anyone who needs a solid floor for cars, tools or storage, where the slab takes heavier loads in one spot and gets driven on. We plan the thickness and rebar around what's going to sit on it.
Get a written estimate for your slab foundation
We reply within one business day. I come out, look at the ground, measure and ask how you'll use the space, then send you a free written estimate. There's no obligation and no pressure to book.
(909) 729-4086Slab foundation permits and ground checks in Pomona
The City of Pomona offers a permit application and a separate grading application. Its forms also include a grading pad certification and a maintenance of uncertified fill form, so it's worth asking whether your lot's pad calls for either one. What your particular slab needs is the city's call. You can find the forms on the City of Pomona building applications page or ask the city at 909-620-2311. When the job needs a permit, we pull it and handle the paperwork with the city. The state also maps liquefaction zones, areas where the stability of the foundation soil has to be investigated before buildings people occupy go up, and cities have to use those zones when they issue permits. So ask about your lot early, not after the design is drawn.
We're based in Pomona and work in the cities around it. A lot of the slabs we pour here go behind older houses where the only way back is a side yard, so we plan how the concrete gets to the forms before pour day, whether by pump or by hand. We see the same tight lots and garage-to-ADU projects on jobs in Claremont and La Verne.
What happens after you call about a slab foundation?
Call or send a message
You call (909) 729-4086 or fill out the form, and we set a time for me to come out. Tell us roughly what the slab will hold so I know what to look for.
I look at your ground
I come out, check the soil and where the water runs, measure and ask how you'll use the space. The written estimate lists the slab size, thickness, base work and rebar, so you can see what's driving the price.
Paperwork, then base and forms
If you go ahead, we file whatever paperwork the job needs with the city, and City Hall is open Monday through Thursday, 7:30 AM to 6:00 PM, and closed Friday. Then my crew digs, packs the base and sets the forms, and the vapor barrier gets checked before any concrete is ordered.
Pour, cure and walk through
My crew pours, finishes and cuts the joints while I'm on site checking the work. When it's done, we walk the finished slab with you before we pack up.
Frequently asked questions
How much does a slab foundation cost near Pomona?
A concrete foundation in the Los Angeles area usually costs about $8 to $15 per square foot, and that's the going rate across the region, not our quote. Where your slab lands in that range depends on its size and thickness, the digging and base work the ground needs, the rebar and how easy the spot is to reach. I'll put a real figure on it once I've seen your lot.
How do I know if my soil will move under a new slab?
You find out by learning what kind of soil is under the lot before the slab is designed. Soils come in expansive, stable and compressible types, and expansive soil swells and shrinks as its moisture changes, so the slab has to be built to resist or span that movement and keep its top level. The ground around it matters too, since thirsty plants, cut and fill areas, poor drainage near the building and how the yard is cared for afterward can move soil much more than the weather does.
Who is allowed to build a slab foundation in California?
The concrete contractor class from the state's Contractors State License Board covers this kind of flat concrete work. No license is needed only when the whole contract price, labor and materials included, is under $500, and that exemption doesn't cover minor work that's part of a larger project. A general "B" builder can take your slab if they also hold the concrete class or subcontract to a properly licensed concrete contractor, so ask which one is pouring yours.
What gets checked before a slab foundation is poured?
The vapor barrier is a big one, and one maker's guide says to inspect and mark any damaged or poorly installed sheet well before the concrete goes in. Ask any crew when they do that check, because a tear found with the truck idling at the curb tends to get covered up instead of fixed. We fix ours before the truck shows up.
How long does it take to build a slab foundation?
Most of the time goes to the work before the pour, meaning the soil questions, the city's paperwork and the base, more than to the pour itself. After that, the slab needs its curing time before walls or heavy loads go on it, and weather can push a pour day. I'll lay out the order of things for your lot when I write the estimate.
Can I build my own slab foundation in Pomona?
Pomona has a form for that, because the city's paperwork includes an owner builder authorization for owners who build and a licensed contractors declaration for owners who hire. If you build it yourself, the soil, the base, the barrier and the joints are all yours to get right, and concrete remembers every one of them. If you'd rather hand that off, we're glad to come take a look.
Pomona, CA
Have your lot looked at before the pour
Call (909) 729-4086, email estimates@concretepomona.com or use the form with your lot address, the slab size in square feet and any grading or soils papers you have, and I'll show up knowing what to look for.