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Freshly poured concrete foundation slab with rebar uprights and gravel base on a Bay Area job site

Concrete Foundations & Slabs — Engineered for Earthquake Country

The Bay Area's seismic faults, diverse soil conditions, and steep terrain demand foundations that are engineered — not just poured. We build the kind you never have to think about again.

Or call (650) 771-5817
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Your Home Is Only as Strong as What It Sits On

A crack in your foundation isn't cosmetic. It's structural. And in earthquake country, structural means everything. The Bay Area sits between the San Andreas and Hayward faults — from SF and Marin to Oakland, Berkeley, and down the Peninsula. The combination of seismic zones, expansive clay soil, and steep grades creates conditions that punish shortcuts. The foundation your home sits on needs to account for all of it.

Maybe you've noticed cracks spreading across your garage floor. Doors that used to close fine are sticking. The floor in your hallway has a slope that wasn't there five years ago. These aren't just old-house quirks — they're your foundation telling you something.

With 12+ years and 500+ projects behind us, we've seen what the Bay Area's ground does to shortcuts. We understand that soil conditions in SF's Sunset are different from Bernal Heights, that Oakland's hills have different challenges than the flat lots in Concord, and that Marin's canyon-side homes face unique drainage demands. Every foundation we build is engineered to meet or exceed California's strict seismic codes — because close enough isn't good enough when the ground starts moving.

Our Concrete Foundation & Slab Services

Every project starts with a site assessment. We evaluate your soil, your slope, and your structure before we recommend a solution — not after.

New Residential Foundations

Engineered for your specific lot — soil tested, seismically compliant, built to outlast the home above it.

Foundation Repair & Leveling

Crack repair, mudjacking, pier installation, and full releveling for settling or shifting foundations.

Slab-on-Grade Construction

Precision-poured concrete slabs for garages, ADUs, additions, and ground-floor living spaces.

Seismic Bolting & Cripple Wall Bracing

Anchor your home to its foundation. Brace cripple walls. Qualify for California's Brace + Bolt grant program (up to $3,000).

Concrete Flatwork

Driveways, walkways, patios, and steps — poured and finished to last in the Bay Area's wet climate.

Foundation Costs in the Bay Area

Crack Repair

Depending on severity and access

$3,000–$5,000

Seismic Bolting

Foundation-to-frame anchoring

$5,000–$15,000

Cripple Wall Bracing

May qualify for Brace + Bolt grant

$5,000–$15,000

Full Foundation Replacement

Based on home size and site conditions

$30,000–$100,000+

Concrete Flatwork (driveway/patio)

Based on square footage and finish

$8,000–$25,000

Prices reflect typical San Francisco market rates. Your exact cost depends on scope, site conditions, materials, and permits. We provide detailed, itemized estimates — no ballpark guesses.

Get Your Exact Price — Free Estimate

Our Process

Our Foundation Process

1

Site Assessment

We inspect your existing foundation, evaluate soil conditions, and identify exactly what needs to happen.

2

Engineering & Estimate

You get a detailed, written estimate with engineering specs — no vague line items, no mystery math.

3

Permits & Prep

We pull all permits through your local building department and prep the site. You don't touch a single form.

4

Excavation & Pour

Excavation, forming, rebar placement, and pour — done by our crew, on our timeline, with daily site cleanup.

5

Inspection & Walkthrough

City inspection, final walkthrough with you, and a 5-year workmanship warranty in writing.

Why Choose Gadget Construction

Seismic-Compliant Engineering

Every foundation we build meets or exceeds California's seismic codes. No shortcuts, no exceptions.

Full Permit Handling

We manage the entire permit process with your local building department — SF's DBI, Marin's CDA, Oakland's Planning & Building, and every jurisdiction in between.

Soil-Specific Design

We don't guess. We assess your lot's soil type and design your foundation accordingly.

5-Year Workmanship Warranty

Every pour, every repair, every bolt — backed by our written 5-year warranty.

Our Foundation Projects

New Foundation & Rebar Layout — Foundation project in Bay Area by Gadget Construction

New Foundation & Rebar Layout

Bay Area

Residential Concrete Slab — Rebar & Formwork — Foundation project in Bay Area by Gadget Construction

Residential Concrete Slab — Rebar & Formwork

Bay Area

Garage Foundation — Subgrade Compaction — Foundation project in Bay Area by Gadget Construction

Garage Foundation — Subgrade Compaction

Bay Area

See More of Our Work

Frequently Asked Questions

Foundation costs vary significantly based on scope and location. Simple crack repairs can start around $3,000–$5,000. Seismic bolting typically runs $5,000–$15,000. A full foundation replacement for a single-family home can range from $30,000 to $100,000+ depending on lot conditions, access, and structural requirements. We provide detailed, itemized estimates after a site assessment — no ballpark guesses.
Seismic bolting and minor repairs typically take 3–5 days of on-site work. A full foundation replacement can take 3–6 weeks depending on the size of the home, permit timeline, and site conditions. We give you a specific timeline before work begins — and we stick to it. 94% of our projects finish on or ahead of schedule.
Yes. Most foundation work requires a building permit — including new foundations, foundation replacements, and seismic retrofits. Permit processes vary by city: SF uses DBI, Marin has the Community Development Agency, and each East Bay and Peninsula jurisdiction has its own department. We handle the entire permit process for you regardless of which city your project is in.
Watch for: cracks in walls or floors (especially diagonal cracks near windows and doors), doors and windows that stick or won't close properly, uneven or sloping floors, gaps between walls and ceilings, and water intrusion in your basement or crawl space. If you notice any of these, it's worth getting a professional assessment — most foundation problems get worse and more expensive over time.
Brace + Bolt is a California Earthquake Authority program that provides grants of up to $3,000 to help homeowners seismically retrofit their homes. Eligible homes are typically older wood-frame houses with cripple wall or unbolted foundations — common across the Bay Area, especially in SF, Oakland, Berkeley, and older Marin neighborhoods. We can assess your eligibility during a free site visit and handle the entire retrofit process if you qualify.
Three things: seismic activity, soil conditions, and terrain. The Bay Area sits between the San Andreas and Hayward faults, so seismic compliance is critical everywhere from SF to Oakland to San Jose. Many areas have expansive clay soil that shifts with moisture — SF's Sunset and Richmond, Marin's low-lying areas, and parts of the East Bay are particularly affected. And the hills across the region create slope and drainage challenges that flat-lot contractors don't deal with. We've been building in these conditions for 12+ years across 31 cities.

Concerned About Your Foundation?

Get a free, no-obligation assessment. We'll inspect your foundation, explain what we find, and give you a clear recommendation — whether that's repair, monitoring, or nothing at all.

Or call (650) 771-5817 — talk to a real person, not a call center.
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