The faults that govern San Francisco
The San Andreas runs offshore just west of the city — the 1906 rupture passed a few miles outside the Golden Gate. The Hayward fault is directly across the Bay and is the source most likely to produce the next damaging East Bay earthquake, which San Francisco would feel strongly. The San Gregorio fault system runs offshore to the south-west.
Soils, slopes and site conditions in San Francisco
In San Francisco, the address is the risk. The Marina District is built on rubble and fill placed for the 1915 Panama-Pacific Exposition, and it liquefied in the 1989 Loma Prieta earthquake with the city's most conspicuous residential damage. South of Market, Mission Bay and the eastern waterfront sit on Bay Mud and former cove fill. By contrast Nob Hill, Pacific Heights, Twin Peaks and much of the west of the city sit on rock or firm ground and performed comparatively well in both 1906 and 1989.
What San Francisco is actually built out of
Victorian and Edwardian wood-frame houses fill the Western Addition, Haight, Noe Valley and the Mission, some pre-1906 survivors and a great many built in the enormous rebuilding that followed. The Sunset and Richmond districts are block after block of 1920s to 1940s row houses built over ground-floor garages — soft-story by design, before anyone used the term. The 1960s and 1970s added stucco apartment buildings over tuck-under parking, and SOMA and Rincon Hill added modern concrete and steel high-rise condominiums.
Carriers price each of these differently. Wood frame on a bolted raised foundation is treated differently from slab-on-grade, post-and-pier carries the highest foundation surcharge in the standard model, and pre-1980 construction without documented retrofit faces an age surcharge that retrofit reduces but does not erase.
How San Francisco risk turns into a premium
San Francisco's defining risk is soft story: an open garage or retail frontage at ground level carrying living space above with no adequate shear wall. The city's mandatory soft-story retrofit ordinance, adopted in 2013, applied to wood-frame buildings of three or more storeys with five or more units built before 1978. Single-family homes over garages — the Sunset and Richmond stock — were not covered by it, and they are the ones that most often arrive at underwriting unretrofitted. Whether the address is on fill is the second decisive fact.
- County risk factor: San Francisco carries a very high tier and a 1.44x multiplier against the CDI-anchored base rate.
- Dwelling limit: Premium scales with the earthquake dwelling limit, which should track your real rebuilding cost rather than your purchase price.
- Deductible: A 5% deductible costs roughly 42% more than a 15% baseline; 25% costs about 22% less. It is the largest lever you control.
- Construction type: Brick and masonry add roughly 38% to the base rate; wood frame sits slightly below baseline.
- Foundation type: Post-and-pier runs about 1.22x, raised about 1.08x, slab about 0.94x.
- Year built and retrofit: Pre-1980 raised-foundation homes without verified retrofit carry an age surcharge. Documented retrofit reduces it.
Choosing a deductible in San Francisco
Replacement costs in San Francisco are high and construction here is expensive, so a percentage deductible converts to a very large dollar figure. Price 10 and 15 percent against a real rebuild cost, not the purchase price and not the assessed value. If the building is a retrofitted soft-story structure, say so — it can change which options are offered.
Remember that a percentage deductible applies to the dwelling limit, not to the claim. On a $750,000 limit, 15% is $112,500 you pay before coverage responds — whether the damage is $120,000 or $700,000. That is why the comparison has to be made in dollars.
What documentation is worth most in San Francisco
For a house over a garage, a permitted ground-floor shear-wall or steel-moment-frame retrofit is the most valuable document in the file, and it should be produced with the permit number and engineer of record. For the older raised-foundation stock in Bernal Heights, Glen Park and the Mission, bolting and cripple-wall bracing apply in the usual way. Unreinforced brick chimneys are common on the Edwardian stock and should be disclosed.
Partial documentation still helps. A permit showing bolting was completed, photographs of cripple wall work, or an Earthquake Brace + Bolt completion certificate all give an underwriter more confidence than a blank field. The application captures retrofit year, contractor, permit number and notes.
If you are buying earthquake coverage in San Francisco
Establish whether your address is on fill or on rock and treat that as the starting point of the conversation. Get the ground-floor question answered plainly: is there a garage opening, and is there a shear wall or frame across it. Condominium owners should obtain the association's master policy declarations page — a large share of San Francisco condominium buildings carry no earthquake coverage at all at the association level, which puts the loss assessment exposure squarely on individual owners.
These are the San Francisco communities this page is written for: Marina, Sunset, Richmond, Noe Valley, Bernal Heights, SOMA, Pacific Heights, Mission, Glen Park, Western Addition.
Before you start the application, gather your homeowners declarations page, year built, square footage and stories, foundation type, retrofit permits or certificates, water heater strapping status, masonry chimney condition, any prior earthquake or structural claim, and lender details if earthquake coverage is required by a mortgagee.
Related San Francisco coverage pages
Nearby counties we publish:
San Mateo County · Alameda County · Marin County · Contra Costa County
Fault corridors that reach this county:
San Andreas Fault corridor · Hayward Fault corridor
Coverage and underwriting guides that matter here:
Soft-story buildings · Liquefaction zones · Condo coverage · Loss assessment
Start wider:
All California county pages · California earthquake insurance guide · Deductible calculator · Carrier markets
Common questions about San Francisco earthquake insurance
Is my San Francisco house soft-story if it has a garage underneath?
Structurally, a house with living space over an open garage has the classic soft-story weakness, whether or not it falls under the city's mandatory retrofit ordinance. That ordinance applied to wood-frame buildings of three or more storeys with five or more units built before 1978, so most single-family homes over garages were excluded. Underwriters still ask about the ground-floor opening and any shear wall or frame.
Does it matter which San Francisco neighborhood I live in?
Considerably. Fill and Bay Mud districts such as the Marina, SOMA and Mission Bay behaved very differently in 1989 from the rock and firm-ground neighborhoods on the hills. Soil condition is part of the underwriting review and should be answered accurately rather than left blank.
Does standard homeowners insurance cover earthquake damage?
No. California homeowners policies (HO-3, HO-5) explicitly exclude earth movement including earthquake shaking. You need a separate earthquake policy for dwelling, contents, and loss-of-use coverage.
How is a percentage deductible calculated?
It applies to your insured dwelling limit — not the claim amount. A 15% deductible on an $800,000 home means $120,000 out of pocket before insurance responds, regardless of total damage. Use the calculator in the sidebar to see your number.
How long does it take to get coverage?
After submitting the application, a broker typically follows up the same business day with market options. Binding and policy issuance generally takes 1–5 business days depending on the carrier and whether additional documentation is needed.