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Concrete Foundations & Slabs in San Francisco

San Francisco's hills, clay soil, and seismic activity demand foundations that are engineered — not just poured. We build the kind you never have to think about again.

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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. San Francisco's unique combination of steep grades, expansive clay soil, and seismic zones 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.

Gadget Construction has been pouring, repairing, and replacing foundations across San Francisco for over 12 years. We understand the soil conditions in the Sunset are different from Bernal Heights. We know which neighborhoods sit on bedrock and which ones sit on fill. And we engineer every foundation 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 San Francisco's wet climate.

Foundation Costs in San Francisco

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 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 SF DBI and prep the site. You don't touch a single form.

4

Construction

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 SF DBI Permit Handling

We manage the entire permit process with San Francisco's Department of Building Inspection.

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

Foundation project 1

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Foundation project 2

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Foundation project 3

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See More of Our Work

What Our Clients Say

“Gadget Construction transformed our 1940s Sunset District home into exactly what we envisioned. They handled everything — permits, inspections, the works. The crew showed up on time every single day and left the site spotless. We couldn't be happier with the result.”

Michael R.

Complete Remodel — Sunset District, SF

“After the last earthquake, we knew our foundation needed work. Gadget Construction came out the next day, explained everything in plain English, and gave us a detailed estimate. The work was done on schedule and on budget. We sleep better at night now.”

Sarah & David L.

Concrete Foundation — Bernal Heights, SF

“We wanted a deck that could handle San Francisco weather without constant maintenance. Gadget Construction recommended composite and walked us through every option. Six months in and it still looks brand new. Best investment we've made in this house.”

Jennifer K.

Composite Deck — Noe Valley, SF

Frequently Asked Questions

Foundation costs in SF vary significantly based on scope. 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 in San Francisco requires a permit from the Department of Building Inspection (DBI). This includes new foundations, foundation replacements, and seismic retrofits. We handle the entire permit process for you — applications, plan submissions, and inspection scheduling.
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. 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. SF sits near the San Andreas and Hayward faults, so seismic compliance is critical. Many neighborhoods have expansive clay soil that shifts with moisture — Sunset, Richmond, and Bayview are particularly affected. And the hills create slope and drainage challenges that flat-lot contractors don't deal with. We've been building in these conditions for 12+ years.

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 (628) 233-3589 — talk to a real person, not a call center.
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