Slab foundation building in Fremont CA - a base built for the clay it sits on
Putting up a new house, addition or garage? We dig out and pack the base, set the steel and pour a slab built to stay put.
- Licensed and fully insured.
- Free estimates at your property.
- We reply within 1 business day.
What does it take to build a slab foundation in Fremont?
Slab foundation building in Fremont, CA, means putting a concrete base for your house directly on the ground. We dig out and pack the base, set the steel, then form, pour and finish the concrete, so the house has a flat, solid floor under it.
Most people who call about a slab are putting up a new house, an addition or a garage. The slab is the first thing that has to be right, because everything else gets built on top of it. The price mostly turns on the slab's size, how much digging and base work the ground needs, how much steel goes in, and whether your soil calls for a post-tensioned slab. Slabs with steel in them cost more per square foot than a plain pad. The schedule depends on the permit, any fault zone investigation your lot needs first, and the weather on pour day. If the plans also call for concrete footings, we pour those too. My estimate puts the price and the work in writing, so you know what you're paying for before anyone digs.
What should you check before pouring a new slab foundation?
Ground that cracks in summer
If the dirt on your lot splits into wide cracks when it's dry and turns sticky after rain, you're probably on clay that swells and shrinks. A slab poured on that ground without planning for it moves with the ground. Fixing a house slab later costs far more than planning for the clay now.
Water sitting on the lot
Puddles that hang around after a rain usually mean the lot drains toward that spot instead of away from it. A slab set there sits in wet ground, and the moisture works its way up into your floors and walls.
An old slab that sank
If you're tearing down or adding on and the old slab is cracked or out of level, the base under it was usually raked flat instead of dug out and packed. Pour new concrete the same way and you get the same cracks, just a few years later.
How we build a slab foundation
We start by digging down to firm subgrade, the soil the slab actually rests on, because loose dirt that's only been raked flat settles later and takes the slab down with it. Then we pack the base and check where the water runs, so the ground falls away from the house and not toward it. Our crew sets the forms and lays the vapor sheet, a plastic layer that keeps ground moisture from coming up into the house. We walk the whole sheet before the pour and patch any tear we find. Next comes the rebar, the steel inside the slab that holds it together and keeps a crack from spreading. We pour early in the day, because concrete placed in midday heat dries too fast on top and ends up weak and dusty. Then we finish it and keep it damp while it cures, which is the stretch when the concrete is still gaining strength. When a budget gets tight, the base is usually the first thing people want to cut, since it's buried by day one. I won't cut it. A good-looking slab on a bad base cracks, and my name is on it.
If your plans call for more than a slab under the house, our foundation installation work covers footings and the rest of the foundation. We start a big flat pour the same way, with the ground dug out and packed and the drainage checked. So if the property also needs room for cars, our concrete parking lot building work starts from the same base.
Get a written price for your slab foundation
We reply within one business day to set a visit. The estimate is free and there's no obligation. I come out, look at the lot and your plans, and put the price and the work in writing.
- hello@fremontcaconcrete.com
- Based in
- Fremont, CA 94538
- Hours
- Mon–Fri: 8 AM–11 PM, Sat–Sun: 6 AM–10 PM
What happens after you call about a slab foundation in Fremont?
Here's how a slab job runs, from your first call to the day our crew packs up and leaves.
Call and tell me about it
Call (510) 574-8512 or send the form and tell me what you're building. Then we pick a time for me to come out to the lot.
I walk, measure and ask
I look at the ground, measure the slab and ask what it needs to carry. You get a written estimate that spells out the base, the steel and the joints, so you know what the price buys before you agree to anything.
We sort out the permit
We sort out any permit with the city before anyone digs, and we handle the paperwork and the inspections. Nothing gets poured until the city says go.
Prep, pour and clean up
Our crew digs, packs the base, sets the forms and steel and pours, and I'm on site for the work. We clean up before we leave, and I tell you how long to stay off the new slab.
Why Fremont homeowners call Ironset Fremont Concrete for slab foundations
On a slab foundation, the part that matters most is the part nobody sees once the walls go up. Send us your project on the contact page or call (510) 574-8512, and I'll come out to look at your lot.
The owner on site for the pour
I'm the one who comes out for the estimate, and I'm on site while our crew does the prep, forms, pour and finishing. The person who priced your base is the one watching it go in.
Licensed in California, fully insured
We're licensed and fully insured. The state licensing board defines a concrete contractor as one who forms, pours, places and finishes concrete, and that covers this whole job from the dirt up.
Built on Fremont neighbor referrals
I started out pouring walks and patios for neighbors, learned a lot fixing slabs other people got wrong, and made it a full business in 2021. Most of our calls still come from Fremont homeowners and their neighbors who saw our work.
Satisfaction guaranteed on every job
That promise covers a house slab the same as it covers a patio. My name is on every slab we pour, so I'd rather get the hidden parts right than have something to explain later.
Slab foundations, fault zones and clay in Fremont
In Fremont, the city's Building & Safety Division handles building permits. On some lots, the ground has to be studied before the city will issue one. Where the Hayward Fault crosses built-up parts of Alameda County, it slowly creeps at the surface and shifts and bends the curbs, streets and buildings on top of it. If your lot is inside a state earthquake fault zone, a state-licensed geologist has to investigate before the city will permit the project. Lots in state zones where ground failure is more likely also need geologic and engineering investigations before work starts. The city can be stricter than the state, so the city's building office is the place to check what your lot needs. You can reach it at 510-494-4460. When your job needs a permit, we work with that office on the paperwork and the inspections, so nothing gets poured early.
The other thing we see on jobs around here is clay that swells when it's wet and shrinks when it dries out. We plan the base and the steel for ground that moves instead of hoping it won't. We run into the same kind of ground on jobs in Union City and Newark, and we take work in the cities around Fremont. If you're not sure we come to you, call and ask.
Questions about slab foundations in Fremont
How much does a slab foundation cost per square foot in Fremont?
Reinforced concrete slab work in the Bay Area usually costs about $9 to $16 per square foot. That's the going rate in the area for slabs with steel in them, not our quote. Where your job lands depends on the size, the digging and base work, and the slab type, and I'll put your price in writing after I've seen the lot.
Does a slab foundation in Fremont need a city inspection?
If your project has a Fremont building permit, yes, because every building permit in the city needs a building inspection before it's finalized. The inspector checks that the work matches the plans the city approved. We build to those plans and handle the inspections with the city.
Is a post-tensioned slab better for expansive clay soil?
On clay that swells and shrinks, a post-tensioned slab usually handles the movement better than a standard one, because the tightened cables squeeze the concrete and help it resist the ground shifting. The trade group for post-tensioning calls it a cost-efficient choice for house foundations on that kind of ground. About 37% of Alameda County's soil area is that high shrink-swell clay. I'll look at your ground and your plans, and we'll talk through whether it fits your house.
How long does a new concrete slab take to cure before you can walk on it?
A new slab should be walkable within 48 hours, though concrete takes 28 to 30 days to fully cure. For heavier loads, the safe plan is to wait a week, so it helps to time deliveries and equipment around that.
What causes cracks in a new slab foundation?
Most bad cracks come from ground moving under the slab or a base that was never properly packed. On clay that swells and shrinks, one engineering paper notes that even a slab designed and built right can show some cosmetic flaws, so a small mark doesn't automatically mean the work was bad. The base, the steel and the pour timing are the parts we control, and the estimate spells them out.
What should I have ready before getting a slab foundation estimate?
Have your property address, the rough slab size in square feet and any plans the city has approved. With those in hand, I can check the lot against the plans when I come out and price the base and steel for what's actually being built.
Related services for your foundation project
Foundation installation
This covers plans that call for footings and walls under the house rather than a slab alone, with the same attention to what the concrete sits on.
Concrete parking lot building
This is useful if your property also needs a paved area for several cars, where a packed base and good drainage keep the surface from sinking and holding water.
Service areas for slab foundation work
Ironset Fremont Concrete is based in Fremont, California, and takes slab foundation jobs in the cities around it. The 12 cities listed here have their own pages, including Hayward and Milpitas, but they aren't the only places we go. If you don't see yours, call and ask.
Fremont, CA
Get your slab foundation priced in writing
The ground on your lot decides the base, the steel and sometimes the slab type, and I can only tell you which once I've stood on it.