The math every homeowner should do before choosing a deductible
Unlike a standard insurance deductible (a flat dollar amount), earthquake deductibles are applied as a percentage of the insured dwelling limit — not the total loss. The deductible is yours to pay before the insurance responds, regardless of how large or small the actual earthquake damage is.
Examples at different dwelling limits:
- $500,000 dwelling limit × 5% = $25,000 deductible
- $500,000 dwelling limit × 15% = $75,000 deductible
- $800,000 dwelling limit × 15% = $120,000 deductible
- $800,000 dwelling limit × 25% = $200,000 deductible
- $1,200,000 dwelling limit × 10% = $120,000 deductible
The practical implication: a 25% deductible on a high-value home may mean that only catastrophic damage produces a claim payment. Moderate damage events — which are far more common than total losses — may not exceed the deductible.
Common earthquake deductible choices in California
Most residential earthquake carriers offer the following options. Availability varies by carrier, construction, foundation, and property characteristics.
- 5%: Highest premium, lowest out-of-pocket. Generally available for standard-construction homes under $1M with slab or retrofitted raised foundation in non-extreme-risk configurations.
- 10%: Meaningful reduction from 5% premium; still provides solid claim protection. A common choice for higher-value homes where 5% is prohibitively expensive.
- 15%: The standard baseline for most rate models. Often the lowest available option for pre-1980 raised-foundation homes without verified retrofit.
- 20%: Noticeably lower premium but substantially higher out-of-pocket. Makes economic sense for homeowners who can self-fund moderate damage events.
- 25%: Lowest common premium option. Most appropriate when the policy is intended to protect only against total or near-total loss scenarios.
When 5% or 10% deductibles are not available
Carrier guidelines typically restrict access to lower deductibles for certain property types:
- Homes over $1,000,000 in dwelling value: Many carriers require 15% or higher regardless of construction or retrofit status.
- Pre-1980 raised or non-slab foundations without verified retrofit: Often restricted to 15% minimum; some carriers require 20%+ without bolting and cripple wall documentation.
- Masonry or brick construction: May face higher minimum deductibles or eligibility restrictions depending on carrier and county.
- Properties with prior earthquake or structural claims: Lower deductibles may require additional underwriting review.
Completing and documenting seismic retrofit — foundation bolting, cripple wall bracing — can restore access to lower deductible options on older homes.
How deductible choice affects annual cost
Using the Best Earthquake Insurance indication model, these approximate multipliers show the premium impact of deductible choice relative to a 15% baseline:
- 5% deductible: approximately +42% versus 15% baseline
- 10% deductible: approximately +16% versus 15% baseline
- 15% deductible: baseline (1.00x)
- 20% deductible: approximately -12% versus 15% baseline
- 25% deductible: approximately -22% versus 15% baseline
For a home with a $1,200/year premium at 15%, switching to 5% would add roughly $504/year. Switching to 25% would save roughly $264/year. The difference between annual savings and the large increase in out-of-pocket exposure usually favors the lower deductible for primary residences.
Do personal property and loss of use have separate deductibles?
Depends on the policy form. Some carriers apply the dwelling deductible to all coverage parts. Others have separate treatment for personal property — a flat deductible or a separate percentage. Loss of use coverage may not have a deductible at all on some forms.
The application captures your requested dwelling, personal property, loss of use, and building code upgrade limits so a broker can compare forms and deductible structures across carriers.
Choosing the right deductible for your situation
- Primary residence, tight budget for post-disaster costs: Choose the lowest deductible available for your property type. A 5% or 10% deductible is most protective when you can't self-fund repairs.
- High-value primary home, significant liquid assets: A 15–20% deductible may be rational if you can fund the out-of-pocket and want to reduce annual premium significantly.
- Secondary or investment property: Higher deductibles are more defensible when the financial exposure is less concentrated.
- Pre-1980 raised foundation without retrofit: Completing retrofit documentation first may restore 10% or 5% deductible access before choosing coverage.