Do I need engineered drawings before you can quote?

For a firm, buildable number, yes — structural work is priced off specified reinforcement, thickness, concrete strength, and detailing. We can give you a useful budget range from preliminary plans or a scope description, but the final number depends on what the engineer specifies.

What is a vapor barrier and does my slab need one?

It's a sheet membrane placed under the slab to stop soil moisture migrating up through the concrete. Any slab with a floor covering over it — or that will be conditioned interior space — should have one. Retrofitting is essentially impossible, so it's a detail worth confirming is in the drawings before the pour.

How long before we can build on a new foundation?

Concrete reaches most of its specified strength by 28 days, though framing often starts earlier once the concrete hits a required percentage of design strength, confirmed by cylinder breaks. The engineer and the specification set that threshold, not the calendar.

Can you add onto an existing building's foundation?

Yes — both horizontal extensions and vertical additions. Tying new structural concrete into an existing foundation requires engineered connection detailing, usually doweling into the existing concrete with epoxy anchors, and the existing foundation's capacity needs verifying before the addition is designed.

Commercial warehouse building with concrete construction

Structural

Concrete Foundations and Structural Slabs

Structural concrete that carries the building — slab-on-grade, tilt-up panels, cast-in-place walls, and additions.

Engineered to the loadVapor barrier as standardInspection-ready documentationPermits handled

Call or Text (669) 200-9478 Request a Quote

20+Years in Business

55Cities Served

1,000+Projects Completed

Mix strength: 3,000–4,500 PSI
Vapor barrier: 10-mil under all interior slabs
Inspections: Pre-pour rebar & final
Credentials: Licensed & insured

Everything Above It Depends on This

Foundation work is the part of a project with the least tolerance for error and the least opportunity to correct it later.

A patio that's slightly out of level is a nuisance. A foundation that's out of level is a structural problem that propagates upward through every trade that follows — framing, cladding, glazing, and finishes all inherit whatever the concrete gave them. That's why foundation work is measured against engineered drawings rather than eyeballed against a good result.

It's also the phase where mistakes become permanently expensive. A misplaced anchor bolt, an embed set to the wrong elevation, or a slab poured half an inch out of tolerance is discovered by the next trade, and by then the fix means demolition. Getting it right the first time is the entire job.

We work from structural drawings on commercial construction, tenant improvements, and structural additions — coordinating with the general contractor, the structural engineer, and the inspector at each hold point rather than pouring and asking questions afterward.

Structural Concrete Systems

Which system is right depends on the building's design, the site, and the schedule — usually decided by the project's engineer before we're involved.

System	How It Works	Typically Used For
Slab-on-Grade	Reinforced slab poured directly onto a prepared, compacted sub-base	Warehouses, single-story commercial buildings, and most light industrial construction
Tilt-Up Panels	Wall panels cast flat on-site, cured, then craned into vertical position	Large-footprint buildings — distribution centers, big-box retail, industrial shells
Cast-in-Place Walls	Walls formed and poured in their final position	Retaining walls, basements, elevator shafts, and irregular geometry
Structural Footings	Isolated or continuous footings carrying concentrated column and wall loads	Column grids, load-bearing walls, and equipment support
Elevated Deck on Metal	Concrete placed over composite steel decking	Upper floors in multi-story construction and mezzanine additions

What the Bay Area Ground Demands

Local geology and seismic requirements shape foundation work here in ways that don't apply in most of the country.

Expansive Soils

Much of the region sits on clay that swells when wet and shrinks as it dries. That seasonal movement lifts and drops whatever sits on it, so foundations here are engineered specifically to resist it.

Seismic Design

California's seismic provisions drive reinforcement detailing, anchorage, and connection design. This is engineered into the drawings, and our job is executing that detailing exactly as specified.

Drainage and Moisture

Wet winters and a high water table in low-lying areas mean sub-slab vapor barriers and site drainage aren't optional details — they're what keeps moisture from migrating up through the slab later.

Sequence and Inspection Hold Points

Structural work stops for inspection at defined points. Building that into the schedule from the start avoids costly waiting.

1

Site preparation and excavation

Excavation to design depth, removal of unsuitable material, and engineered fill placed and compacted in lifts to the specified density.

2

Sub-base, vapor barrier, and under-slab utilities

Aggregate base, vapor retarder, and any under-slab plumbing or conduit installed and coordinated with the other trades before anything is covered.

3

Formwork and reinforcement

Forms set to line and grade, rebar placed and tied per the structural drawings with correct cover and lap lengths, embeds and anchor bolts located precisely.

4

Pre-pour inspection

The hold point. Reinforcement, embeds, and formwork are inspected and signed off before concrete is ordered. Nothing gets poured over an unapproved inspection.

5

Placement, finishing, and cure

Concrete placed, consolidated, and finished to the specified tolerance, then cured under controlled conditions with cylinder testing where the specification requires it.

What We Coordinate With

Foundation work touches nearly every other trade on a commercial project.

1

Design and Approval

Structural engineer's drawings and detailing
Architect's dimensional and finish requirements
Geotechnical report recommendations
Local building department inspection schedule
Special inspection and materials testing requirements

2

Other Trades

Under-slab plumbing and drainage
Electrical conduit and floor boxes
Steel fabricator's anchor bolt templates
Site utilities and stormwater connections
Framing and shell contractor's schedule

We Build to the Engineer's Drawings

Structural concrete is not a place for field improvisation. Slab thickness, reinforcement size and spacing, concrete strength, and connection detailing are all determined by a licensed structural engineer for your specific building, soil report, and seismic requirements. If your project doesn't have engineered drawings yet, that's the first step — and we're glad to talk through scope and budget beforehand so you know what you're heading into.

What Drives the Cost of Foundation and Structural Work

Structural concrete is priced off the engineer's specification, not a flat rate — these are the variables that move a budget range into a firm number.

1

Specified by the Engineer

Slab thickness and specified concrete strength (PSI)
Reinforcement size, spacing, and detailing — rebar tonnage adds cost directly
System type: slab-on-grade is typically less costly than tilt-up or elevated deck
Special inspection and materials-testing requirements called out in the drawings

2

Site and Schedule

Soil conditions — expansive clay or poor bearing soil can require deeper footings or engineered fill
Site access for concrete trucks, pumps, and crane work on tilt-up panels
Under-slab utility coordination and how many trades need to sequence before the pour
Schedule constraints — compressed timelines or off-hours work on an occupied site add cost

Foundation and Slab Questions

Transformations

Foundations & Slabs: Before & After

Representative comparisons of the condition we're typically called to, and what the finished work achieves. Drag the handle across each frame.

Fresh concrete being leveled with a screed across a new slab — Side-yard utility slab
Structural slab repair
A slab with a wide crack and a visible height difference across it — the tell that the ground beneath had moved rather than the concrete simply shrinking. Repair was the wrong answer here, so the affected bay was removed, the base rebuilt, and the section repoured.
Root cause fixed in the base, not covered over at the surface
Only the failed bay replaced, keeping cost down
New section tied to the old with dowelled joints

Wide crack opening across a ground-level concrete slab — Side-yard utility slab
Structural slab repair
A slab with a wide crack and a visible height difference across it — the tell that the ground beneath had moved rather than the concrete simply shrinking. Repair was the wrong answer here, so the affected bay was removed, the base rebuilt, and the section repoured.
Root cause fixed in the base, not covered over at the surface
Only the failed bay replaced, keeping cost down
New section tied to the old with dowelled joints

Crew inspecting a large warehouse with a smooth, level polished concrete floor — Distribution warehouse
Industrial floor slab
A worn warehouse slab with spalled joints that were shaking forklifts apart and a surface too dusty to keep clean. Joints were rebuilt with armored edges, the slab ground flat, then densified and polished.
Armored joints that stop edge spalling under wheel loads
Flatness restored to specification across the racking aisles
Densified surface — no more slab dust in the operation

Deteriorated warehouse interior with a broken, debris-covered floor slab — Distribution warehouse
Industrial floor slab
A worn warehouse slab with spalled joints that were shaking forklifts apart and a surface too dusty to keep clean. Joints were rebuilt with armored edges, the slab ground flat, then densified and polished.
Armored joints that stop edge spalling under wheel loads
Flatness restored to specification across the racking aisles
Densified surface — no more slab dust in the operation

Drag the handle — or use the arrow keys — to compare the condition before and after.

More Structural & Foundational Services

Related work we handle, often on the same project as this one.

Industrial FloorsHeavy-duty floor slabs engineered around forklift traffic, racking loads, and flatness tolerances.Parking LotsParking surfaces zoned by actual traffic load, with stormwater drainage and accessible routes designed in.Sidewalks & WalkwaysPedestrian concrete built to accessibility standards — sidewalks, entry approaches, curb ramps, and courtyards.ADU FoundationsSlab, pier-and-grade-beam, and raised foundations for ADUs — sized for Bay Area soils, seismic zones, and the permit process California law requires.Gunite & ShotcreteSprayed concrete for pool shells, retaining walls, and slope stabilization — placed under pressure where forms aren't practical.Concrete Retaining WallsFormed, poured, and segmental block retaining walls — built with the drainage and footing an engineer actually specified, not guessed at.Floor Hardening & DensifyingChemical densifiers and hardeners for warehouse and industrial floors — extends service life and cuts dusting.

Often Quoted Alongside This

Work from our other category that regularly shows up on the same site visit.

Concrete DrivewaysVehicle-rated driveways with engineered thickness, controlled cracking, and drainage that moves water away from your garage.Concrete PatiosOutdoor living surfaces planned around furniture, foot traffic, and how your household actually uses the yard.Stamped ConcreteStone, brick, slate, and plank patterns pressed into fresh concrete, colored in layers and sealed for depth.Concrete StainingPenetrating color that becomes part of the slab — a way to transform existing concrete without replacing it.

Service Area

Where We Provide Foundations & Slabs

We provide foundations & slabs across 55 cities in Santa Clara, Alameda, San Mateo, and Santa Cruz counties. Ground conditions, permitting, and the failure modes we see vary city by city, so each has its own page.

Counties

Cities in Santa Clara

All Service Areas

Read Before You Decide

Guides from our Learning Center that bear directly on this kind of work.

What Are the Different Types of House Foundations?Slab-on-grade, raised floor, and basement — how each is built, what each costs, and which suits Bay Area conditions.What Are the Warning Signs of Foundation Problems?Which cracks, sticking doors, and sloping floors actually matter — and which are just an old house being an old house.What Is a Slab-on-Grade Foundation?How a slab foundation is built layer by layer, what each layer does, and where quality problems hide.What Causes Foundation Settlement?Expansive clay, poor compaction, water, and trees — the four mechanisms behind almost all foundation movement in the Bay Area.What Is Concrete? A Plain-English ExplanationWhat concrete is actually made of, why it isn't cement, and what happens chemically between the pour and thirty years later.Why Is My Concrete Cracking?Reading the crack to find the cause — which patterns are normal, which need attention, and the tests we use on a site visit.

Discuss a Structural Project

Send over your plans or describe the scope. We'll review, ask the right questions, and give you a clear proposal.

Call or Text (669) 200-9478 See Commercial Services