Earthquake deductibles: why they're so high

An earthquake deductible is a percentage of your dwelling limit, not of your loss, and it commonly runs from 2% to 25%. On a $500,000 dwelling limit, a 10% deductible means the first $50,000 of covered damage is yours. Insurers set the percentage this high because one earthquake damages many homes at once and the product is built for catastrophic loss, not for repairs of ordinary size. The practical result is that a moderate earthquake can cause real damage and produce no payment.

How the deductible is calculated

The details come from the policy, so the example here is the California Earthquake Authority's basic homeowners policy (form BEQ-3B, January 2026 edition). Other insurers' earthquake policies differ, which is a reason to read yours; the general picture is in earthquake insurance explained. The CEA form works like this:

• Percentage of the limit. The deductible is a percentage of the combined limit for Coverage A (dwelling) and Coverage B (extensions to dwelling).
• Applied once per seismic event. The policy defines a seismic event as all earthquakes and aftershocks within 360 hours of the first one. You pay one deductible for the whole sequence.
• Only some costs count toward it. What meets the deductible is the reasonable cost of repairing or replacing covered dwelling and extension damage, emergency measures above the first $1,500, up to $10,000 of land restoration, and the building code upgrade costs covered by the policy, though code upgrade money is paid only if you actually do the work. The cost of repairing personal property does not count.
• Contents wait for the house. On the Standard Homeowners form, nothing is paid for belongings until covered dwelling loss exceeds the deductible. On Homeowners Choice, the contents deductible is waived if the dwelling deductible is met.
• Some coverages escape it. Loss of use has no deductible, and neither do the first $1,500 of emergency repairs.
• It does not shrink your limit. The deductible comes out of the loss, not out of the limit.

Check how your own policy defines it. Some insurers apply the percentage to the replacement value of the structure, some to each coverage separately and some to the total loss.

What it looks like in dollars

These are hypothetical dwelling limits against the CEA's deductible choices.

Not every column is available to every home. According to CEA, the 5% and 10% choices are not offered when the dwelling limit is above $1,000,000, or for frame homes built before 1980 that are not on a slab foundation and lack a verified retrofit. The California Department of Insurance explains that state law requires insurers to offer only a 15% deductible, so a 15% deductible is the lowest available in those cases.

Why they are so high

History. The January 1994 Northridge earthquake changed how insurers priced the peril. A 2009 Insurance Information Institute paper on the CEA says that after Northridge most insurers cut back on writing homeowners policies and filed for higher rates and for higher deductibles, from the 10% then typical to 15% or more. When the Legislature required a minimum earthquake policy in 1995 and created the CEA in 1996, the basic policy carried a 15% deductible. The industry paid more for that one event than it had collected in earthquake premiums over the previous 30 years, according to the Insurance Information Institute (Triple-I).

Correlation. Kitchen fires and burst pipes arrive a few at a time; an earthquake damages thousands of homes in a few seconds. An insurer cannot spread that risk across a year of mixed claims, so it prices the policy for catastrophe and buys reinsurance for the tail. A high deductible removes the most frequent type of claim, the repair of cracked plaster and shifted fixtures, and leaves the product paying for structural loss.

The price trade. A higher deductible lowers the premium, because the insurer is no longer paying the smaller claims. In practice, a large deductible is a way to keep a policy affordable on a house near an active fault.

The case against is also fair. A deductible of this size means the policy is nearly useless for moderate damage, and a homeowner can pay premiums for years and collect nothing even after a damaging quake. Buyers who want to be covered for the middle of the loss range have to pay for a low deductible where it is available, or accept that the policy covers only the worst outcome.

A worked example (hypothetical)

Say your dwelling limit is $500,000 and an earthquake does $80,000 of covered damage to the house, including $10,000 for code upgrades the city requires.

• With a 10% deductible ($50,000): the policy pays $80,000 minus $50,000, or $30,000, assuming you do the repairs and the code work.
• With a 15% deductible ($75,000): it pays $5,000.
• With a 20% deductible ($100,000): it pays nothing for the house, and on the Standard form it pays nothing for the $15,000 of damaged belongings either, though loss-of-use costs are still paid.

The difference between the 10% and 20% choice is $30,000 on this loss, which you can compare with the premium difference your agent quotes. If your damage was $40,000, none of the three would pay on the house.

Choosing a deductible

1. Treat the deductible as cash you need. Whatever percentage you pick is money you must find before the policy pays, in addition to the mortgage you still owe. If you could not find $75,000, a 15% deductible is a risk you are carrying.
2. Ask for quotes at three levels. Have your agent price the same limit at three deductibles. The premium step between them is the price of closing part of the gap.
3. Check eligibility. If you own a pre-1980 wood-frame house on a raised foundation, a verified retrofit can open up lower deductibles and premium discounts of up to 25% at the CEA. See The California Earthquake Authority explained.
4. Decide whether contents matter. A separate contents deductible only helps if the dwelling deductible is met, so for most buyers contents coverage is a small part of the decision.
5. Think about the tail, not the middle. If your house is well built and well anchored, the damage from a moderate quake may fall below any deductible you could buy. The policy then protects you against the rare severe event.

Some people fill the gap another way. Parametric policies, which pay a fixed amount when measured shaking at your address crosses a threshold, regardless of your actual damage, have been sold in California; Insurance Journal reported the launch of one for Californians in October 2018. They are not a substitute for a real earthquake policy, and availability and terms change, so confirm before relying on one. The category is covered in parametric insurance for homeowners: how it works and its limits.

How it compares with other percentage deductibles

The hurricane deductible guide covers wind in coastal states, where the Insurance Information Institute says 1% to 5% is typical. Earthquake deductibles are several times larger. Both are computed from the dwelling limit, so the arithmetic is the one in percentage deductibles: how a 2% deductible really works, and the hurricane and percentage deductible calculator does it for you. For the ordinary deductible on fires and burst pipes, see should you raise your deductible to lower your premium?.

At claim time

Because only certain repair costs count toward the deductible, the contractor's estimate matters. Ask for it itemized by room and trade, photograph every crack and displaced item, and keep photographs of the house from before the quake so that earthquake damage can be separated from settling that was already there (foundation cracks and settling: what's covered). The California Department of Insurance warns that an insurer can deny claims not reported within one year. If your estimate is close to the deductible, a second estimate or an engineer's assessment is a legitimate way to confirm the scope, and the appraisal clause in your policy covers disputes about the amount of loss.

Key takeaways

• An earthquake deductible is a percentage of your dwelling limit, 5% to 25% at the CEA and often 10% or more elsewhere, so a moderate quake can leave you with a loss and no payment.
• At the CEA, one deductible applies per seismic event of up to 360 hours, repairs to belongings do not count toward it, and loss of use and the first $1,500 of emergency repairs are exempt.
• The deductibles are high because of the post-Northridge repricing, because earthquakes hit many homes at once, and because a higher deductible lowers the premium.
• Get quotes at three deductible levels, check whether a retrofit lowers your options, and pick a number you could actually pay in cash.
• Photograph your house now and get itemized estimates after a quake, since only covered dwelling repair costs count toward the deductible.