How much does LA foundation underpinning cost?

$15K–$45K partial; $60K–$90K whole-house. Hillside trends higher.

Seismic retrofit cost in LA?

$5K–$15K typical. EBB grant covers up to $3K.

Does my old SF home need a new foundation?

If brick or unreinforced concrete with cracking, possibly. Full replacement $80K–$150K.

SF soft-story retrofit cost?

$60K–$150K for a typical wood-frame-over-garage building.

California Foundation.

Foundation work across LA — seismic retrofit, crawlspace pier replacement, full replacement on settled slabs. Engineer + LADBS permit on every job.

Bay foundations — pre-1940 brick or unreinforced concrete. We retrofit, underpin, or fully replace. Soft-story upgrades, hillside underpinning routine.

Los Angeles

$15K – $90K

Partial pier bottom; full replacement top.

Timeline — 2–5 weeks work; permits 4–8 weeks.

Los Angeles Foundation →

San Francisco Bay Area

$25K – $150K

Older Bay homes often need full replacement; hillside lots top.

Timeline — 3–7 weeks work; permits 6–12 weeks.

San Francisco Bay Area Foundation →

Scope — what we deliver.

Structural engineering
Permits
Excavation + shoring
Form + pour or pier
Backfill + restoration

Permits look different in LA vs the Bay.

Los Angeles — permit notes

LADBS permit required.
Engineer of Record signs plans.
Seismic retrofit commonly bundled.
Shoring + neighbor notification near property line.

Bay Area — permit notes

Permit required.
Engineer + geotech often both.
Soft-story trigger on many remodels.
Brick-to-concrete is standard upgrade.

How we think about foundation.

Structural work is the most expensive thing you can do badly and the cheapest thing you can do right. A correctly engineered shear wall, hold-down, or beam costs a few hundred dollars more than the wrong one and protects the building for its remaining life. We refuse to deviate from a stamped engineer's calc — the engineer's stamp is what protects the homeowner in a claim, not the contractor's experience.

California's seismic code has changed dramatically since 2010 and again since 2020 — most homes built before 1980 carry latent risk we can correct in a single retrofit pass. We treat foundation, framing, and shear as one system, never as separate trades.

The schedule, written out.

Week 0
Engineering site visit
Licensed structural engineer reviews existing, soils, slope, snake-camera at foundation cracks.
Week 1–4
Engineering + plans
Stamped calcs, framing plan, hold-down + shear schedule, foundation detail.
Week 4–8
Permit
City structural review — usually faster than full ADU plan check.
Week 8–10
Foundation + shear access
Selective demo, crawlspace prep, excavation if underpinning.
Week 10–14
Install
Anchor bolts, hold-downs, shear panels, cripple-wall bracing, structural framing, beam install.
Week 14–15
Inspection
Inspector verifies every hold-down and shear-nail pattern — common rejection point if subs cut corners.

Materials & assemblies.

Component	Default spec	Why
Anchor bolts	5/8" Simpson Titen HD or equivalent epoxy-set, 7" embed minimum	Old square-washer ½" bolts are not enough; full retrofit upsizes them.
Hold-downs	Simpson HDU or PHD with stamped placement at all shear-wall ends	Placement is the failure mode — wrong stud or wrong end = no hold-down at all.
Shear panels	15/32" structural-1 sheathing, 8d common nails @ 4"/12" or per calc	Air nails at the wrong PSI under-drive — every nail must be flush, not over.
Beams (LVL / PSL)	Engineered lumber per calc, with stamped connection hardware	Field-fabricated steel saddles are a frequent failure point — only use stamped connectors.
Foundation repair	Helical piles, push piers, or wide footings depending on soil + load	Choice is geotech-driven, not contractor-preference.

Hidden costs we flag up front.

Line item	Range	When it hits
Soils / geotech report	$4K–$12K	hillside, expansive clay, or new addition load
Excavation + shoring	$8K–$40K	underpinning a settled foundation
Plumbing + electrical re-route	$2K–$10K	foundation work cuts through existing services
Temporary support	$2K–$8K	interior shoring for beam install

cheaper alternatives

What we'd consider — and what we wouldn't.

Brace-only retrofit (no bolt-down)
Half the cost but only addresses cripple-wall, not sill movement — incomplete protection.
Carbon-fiber wall repair
Works for crack stabilization but doesn't add capacity for new load.
Owner-permit structural work
Not legal in most CA jurisdictions for residential — requires licensed contractor + engineer.

pitfalls — takeover-job patterns

Mistakes to avoid.

Pulling a permit without an engineer's stamp — almost every city now requires it for shear / beam / foundation
Cutting a notch in a joist or beam to fit plumbing — single most common code failure on rough inspection
Skipping the cripple-wall bracing on a pre-1980 raised foundation — biggest cost-to-benefit retrofit available
Believing 'the inspector will catch it' — the inspector verifies what's exposed, not what's already buried

Foundation — Los Angeles.

Foundation — Bay Area.

In short.

How much does LA foundation underpinning cost?: $15K–$45K partial; $60K–$90K whole-house. Hillside trends higher.
Seismic retrofit cost in LA?: $5K–$15K typical. EBB grant covers up to $3K.
Does my old SF home need a new foundation?: If brick or unreinforced concrete with cracking, possibly. Full replacement $80K–$150K.
SF soft-story retrofit cost?: $60K–$150K for a typical wood-frame-over-garage building.

More we build.

Got a foundation project in mind?

Send us the address. We'll pull local zoning, setbacks, and foundation feasibility before you spend on drawings.

Start a project →