Slab on Grade Foundation Contractor — Riverside & San Diego Counties
A slab on grade foundation is the most common way homes get built in Southern California, and it is the foundation type Precision Set-Up Concrete pours most. Flat pad, one elevation, thickened footings, steel to the engineer's spec, and a finished slab your framer can start on.
Send plans to info@psuconcrete.com, call (800) 294-2207, or request a free bid.
What is a slab on grade foundation?
Slab on grade foundations are completely flat foundations with no steps and no walls. The structural slab sits directly on prepared ground, with the perimeter and interior bearing lines thickened into footings that carry the load of the structure into the soil below. There is no crawl space and no separate floor system — the slab is the floor.
That simplicity is the advantage. Fewer forms, fewer steps, fewer places to be out of square, and a much faster path from an approved permit to a framer on site. It is also why a slab on grade is unforgiving of sloppy layout: everything is decided before the pour, and after the pour, it is permanent.
When a slab on grade is the right foundation
Your structural engineer makes the call, working from the soils report and the design of the structure. In practice, a slab on grade is usually specified when:
- the pad is level, or can be graded level without excessive fill;
- the design does not call for a wood floor system or crawl space;
- utilities can be run underground and stubbed up through the slab;
- the finished floor elevation does not need to sit well above surrounding grade.
Where a lot has meaningful slope, the plans typically move to a stepped foundation or a raised stem wall design instead. We build all three — see concrete foundations for the full range, or custom home foundations if you are building one-off.
How long a flat slab on grade takes
On a typical flat slab on grade with no steps and no walls, 15 working days has long been the internal benchmark we measure ourselves against, weather permitting. Treat it as a benchmark rather than a commitment: the actual schedule for your job depends on the plans, the pad, inspection availability, and the weather, and the schedule that counts is the one written into your contract.
Why the schedule matters at all: every extra week your foundation sits unfinished is another week of construction loan interest and another week your framer's crew is scheduled somewhere else.
Require any foundation contractor you are considering to commit to a timeline in writing, and hold them to it. Foundations with walls and steps legitimately take longer — how much longer depends on the complexity of the work, and an honest contractor will tell you that up front instead of discovering it later.
What goes into the slab before the concrete does
Pad and sub-grade
Everything starts with the pad. It needs to be at the elevation the plans assume, properly prepared, and compacted to the specification on the soils report. Most slab problems that show up years later were built into the ground before the first form went up.
Footings and grade beams
Perimeter footings and interior grade beams are trenched to the widths and depths on the structural sheet. This is the structure of a slab on grade — the flat part in the middle is not carrying the building by itself.
Reinforcing steel
Rebar size, spacing, laps, and cover come from the engineer's drawings, tied and chaired so the steel stays where it belongs during the pour. Steel that ends up lying on the ground under wet concrete is not doing the job it was designed to do.
Vapor barrier and underground
Underslab plumbing and electrical are set and inspected, and the vapor barrier is placed and lapped before the pour. Once concrete is over it, a missed sleeve or a torn barrier becomes a saw-cutting project.
Anchor bolts and hold-downs
Anchor bolts and hold-downs are located from the framing plan and set before the pour — not drilled and epoxied in afterward because someone forgot. Their placement is the physical connection between your foundation and everything above it.
Square, flat, and finished right
Square refers to the exactness of the outside dimension of the foundation. Flat refers to the flatness of the slab itself. Both are measured by your framer, your cabinet installer, and your flooring contractor, whether or not anyone says so out loud.
A slab that is out of square makes the framer cut and shim. A slab that is out of flat shows up in flooring underlayment, in door reveals, and in the tile guy's float bill. We build to the dimension. Require your foundation contractor — whoever you hire — to guarantee the accuracy of the work in writing and to fix any problem they create for the trades that follow.
Post-tension and conventionally reinforced slabs
Some residential slabs in Southern California are designed as post-tensioned slabs and some as conventionally reinforced slabs. That decision belongs to the structural engineer and the soils report, and both are common on California residential work. We build the slab the approved plans specify, with the materials the engineer called out. If a detail on the drawings will not build as drawn, we raise it before the pour, not after.
Bid from your plans
We bid from your plans. The bid covers everything required to complete the foundation scope on those drawings. You get a change order in two situations: you change the work, or the grade does not match the plan. No surprise line items after the fact for equipment or materials that were always going to be needed.
For the full checklist on vetting a foundation contractor — timelines, lien releases, workers' comp, materials verification — read 7 steps to a foundation that a concrete contractor would build his own home on.
Slab on grade FAQ
How long does a slab on grade foundation take? It depends on the plans, the pad, inspection availability and the weather. A flat slab with no steps or walls moves faster than a stepped or stem wall foundation. We give you a schedule with the bid rather than a generic number, and the schedule that counts is the one in your contract.
When can the framer start after the pour? After the concrete has cured adequately for framing loads and the forms have been stripped and the site cleaned. The exact wait depends on the mix, the weather, and the structural requirements on your plans.
Who pulls the permit for a slab on grade foundation? The owner or general contractor always pulls the building permit. Precision Set-Up Concrete never pulls building permits and is never listed on the permit. We build to the permitted plans and coordinate our schedule around the pre-pour inspection.
Do you pour ADU slabs? Yes. Detached ADU and casita slabs are ordinary slab on grade work — smaller footprint, same engineering, same inspection sequence.
Do you pour garage and shop slabs? Yes, including on the same contract as the house so the site is not re-mobilized twice.
Get a slab on grade bid
Call (800) 294-2207 · info@psuconcrete.com · Monday–Friday, 7:00 a.m.–5:00 p.m. Request a Free Bid Precision Set-Up Concrete · (800) 294-2207 · psuconcrete.com · CA License #963015 (C-8)