Slab foundation building in Simi Valley CA - a solid, level base under your new home
Building a new home or addition and wondering what it should sit on? We help you choose the slab and build it from the ground up.
- Licensed and insured.
- Free quotes on site.
- Replies within 1 business day.
What does it take to build a slab foundation in Simi Valley?
Slab foundation building in Simi Valley means grading and packing the ground, setting forms and steel, and pouring a concrete slab that sits right on that prepared ground and carries your house.
Most people who call about a slab are building a new house, an addition or a backyard unit, and their plans call for a slab poured on the ground instead of a raised floor. The price mostly moves with the size of the slab, the type your designer picks, and how much digging, grading and base work your lot needs before any concrete shows up. If an old slab has to come out first, we handle that with concrete cutting. The schedule turns on the permit review and inspections, the weather around pour day and the time the concrete needs to cure, or slowly harden, before framing starts. Your own numbers come from the written estimate I give you after the site visit.
How do you know your site needs work before the slab goes in?
Water pooling on the pad
If rain leaves puddles where the house will go, the ground isn't shedding water yet. We sort that out with grading before the forms go in, because a slab poured over a wet spot can mean damp floors later.
A yard that slopes
A sloped lot usually means cutting some ground and filling other ground to make a level pad, and fill dirt that isn't packed will settle. Skipping that work saves a little now and leaves you with a cracked, uneven slab down the road.
An old slab in the way
When an old slab is cracked or sinking, the ground under it usually moved, so it comes out instead of getting a new layer poured on top. Covering it just carries the same problem into the new floor.
How we handle slab foundation building
We start by going over the slab type with you and whoever designed it, because the drawings set the thickness, the steel and how the edges are built, and I want all of us reading them the same way. Then we dig down to the subgrade, the ground the slab will sit on, and pack the base in layers instead of raking loose dirt level. We check where the water will run so the finished slab sheds it away from the walls, then we set the forms and place the rebar, the steel bars that hold the concrete together when it tries to pull apart, or the cables on a post-tensioned slab. On pour day we place and finish the concrete, then keep it damp while it cures before anyone builds on it. When a budget gets tight, people want to trim the base work because nobody sees it once the slab is down, and that's the one place I won't cut, since a slab is only as steady as what's under it.
A slab is often only part of the job. Some houses need foundation installation with deeper footings along the edges or under heavy walls, and we build those with the slab when the plans call for it. Property owners with a commercial site sometimes have us pour the building slab and the concrete parking lot around it, so the grading and drainage get planned once for the whole site.
Slab for a new home
This suits a ground-up build where the plans lay out the whole slab, edges and all. Everything under it, from the packed base to the lines the plumber runs, gets checked before the pour, because nothing gets fixed under a slab afterward.
Slab for an addition or second unit
This suits a room addition, garage or backyard unit that sits beside the existing house. It's the kind of job we like, because the new slab has to meet the old foundation at the right height and the ground between them often needs reworking.
Get a written estimate for your slab foundation
We reply within one business day to set up a visit. I come out, look over the site and your plans, and give you a free written estimate with no pressure and no obligation.
(805) 261-5009- Based in
- Simi Valley, CA 93065
- Hours
- Mon–Fri: 6 AM–9 PM, Sat–Sun: 8 AM–10 PM
What happens after you call about a slab foundation in Simi Valley?
Here's how a slab foundation job runs from your side, from the first call to the day the crew packs up.
Tell us about your project
Call (805) 261-5009 or send the form with your address and what you're building. If you have drawings from an engineer or designer, send them along, since they decide most of the job.
I walk the site with you
I come out, look at the ground, the slope and where the water runs, and ask a lot of questions. You get a written estimate for the work, and I'll tell you plainly what I can't pin down until we're digging.
We sort the permit and prep
Once you say go, we work out any permit with you. Then the crew starts on the grading and the packed base.
The crew pours, I check in
A crew lead runs the work day to day, and I stop by at the steps that matter most, like the packed base and the steel before the pour. When the slab is done, we clean up and walk it with you before the framers take over.
Why Simi Valley homeowners call Custom Simi Valley Concrete for slabs
I come out for the estimate
I look at your lot myself, and on the sloped yards we see all over Simi Valley that usually means a lot of questions about grading and drainage. I'd rather tell you what we can't know until the ground is open than guess at it.
Framing first, concrete since 2017
Before I started this business in 2017, I spent years framing houses and got curious about what was under them, so I learned concrete on flatwork crews, the ones pouring driveways, patios and slabs, and on foundation crews. That's why I pay the most attention to the parts you won't see once the slab is down, the base, the forms and the joints.
Licensed and insured on your job
We're licensed and insured. A foundation is the one part of the house you can't easily redo, so the people pouring it should be covered.
On a slab, what's under it matters more than anything on top, so we start with the ground. Send us your plans and address or call (805) 261-5009 and I'll come take a look.
Slab foundations and site work in Simi Valley
In Simi Valley, the city's Building and Safety division reviews and inspects building projects, so a new home or addition on a slab goes through it. Public Works Development Services issues encroachment permits for any work in the public right-of-way, the street side of your property line, and it also handles floodplain rules and stormwater standards, which can shape how the pad is graded and where the water goes. When your job needs a permit, we tell you which office handles it and pull it as your contractor, or help you if you'd rather pull it yourself as an owner-builder. The Building and Safety front counter answers at (805) 583-6723. If the slab is for a new unit under SB9, email the city's Planning staff before you submit anything.
Some lots sit inside a state Seismic Hazard Zone, which marks ground where the soil or rock is likely weak enough to fail in an earthquake unless the grading and construction take proper precautions. We want to know that early, along with the slope and drainage, so your designer can plan for it before we set a single form, and we ask the same questions on jobs in Moorpark and Thousand Oaks.
Questions about slab foundations in Simi Valley
How much does it cost to build a slab foundation in Simi Valley?
There's no flat price for a slab foundation, because the cost comes from your plans and your lot more than from the concrete itself. Steep ground, tight access for the concrete truck and a lot of fill to pack all add to it, and a post-tensioned slab is priced differently from one reinforced with rebar alone. I give you a written estimate after the site visit, so call (805) 261-5009 or use the form to set that up.
What is the best slab foundation for a house on shrink-swell soil?
A national post-tensioning trade group calls a post-tensioned slab a cost-efficient, high-performance choice for homes on shrink-swell soil, the kind that swells when it's wet and shrinks as it dries. In a post-tensioned slab, steel cables run through the concrete and get pulled tight after it hardens. If your lot has that kind of soil, ask your designer whether one suits your house, and we'll go over it with both of you.
Will my new slab foundation crack?
A new slab can still show small cracks, but the same trade group says post-tensioning cuts down on cracking and keeps the cracks that do form tight. Tight cracks keep insects out and let less water seep in, which matters because moisture can damage flooring and cause mold. Engineering research also finds that even a well designed and well built slab on shrink-swell soil can show cosmetic marks, so I tell owners up front to plan for a few.
What time of day should a concrete slab foundation be poured?
Concrete industry guidance says to place and finish concrete outside the hottest part of the day when possible. Heat can make the top set faster than the crew can finish it, which leaves a weaker, dusty surface, so we plan pour day around the hottest hours when the schedule allows.
How do I check whether my lot is in an earthquake hazard zone?
Look up your address on the state's EQ Zapp map, which shows whether a property sits in an earthquake hazard zone. Have the result handy when we talk, because it tells your designer and our crew how much care the grading needs.
What license does a contractor need to build a concrete slab in California?
In California, the state's C-8 concrete contractor class covers contractors who form, pour, place and finish concrete, which is the work a slab foundation takes. Ask any contractor you're considering which license they hold before you sign anything.
Other foundation and site work we build
Worth a look if your plans call for deeper footings or a raised floor instead of a slab, or if the new slab ties into existing foundation work.
For property owners with a commercial building or rental site, the concrete lot around it needs the same careful base and drainage planning, built to take daily traffic.
Service areas for slab foundations near Simi Valley
Custom Simi Valley Concrete is based in Simi Valley, California, and builds slab foundations across the cities around it, including Camarillo and Santa Clarita. The 12 cities below each have their own page. If your city isn't listed, ask us.
Simi Valley, CA
Get your slab foundation estimate started
Have your address, the planned slab size and your EQ Zapp result handy when you call, and the first visit gets right to your lot.