Homeowners Coverage Gap Analyzer
Analyze coverage gaps on a standard ISO (Insurance Services Office) HO 00 03 homeowners policy: replacement cost vs current Coverage A (dwelling) limit, Coverage C (personal property) adequacy, Coverage E (personal liability) tier alignment with net worth, scheduled-items endorsement gaps, flood / earthquake exposure. Cited to ISO HO 00 03, Fannie Mae Selling Guide §B7-3, FEMA NFIP (National Flood Insurance Program), III (Insurance Information Institute) research.
Estimated annual premium impact of all remediations: +$290/yr
- Priority 1 · Liability+$250/yr
Liability coverage ($300,000) is significantly below the $1,000,000 benchmark for net worth $750,000. Add umbrella coverage now — defense costs alone on a serious bodily-injury claim can exceed the underlying limit.
- Priority 2 · Coverage A+$40/yr
Coverage A is between 80–100% of replacement cost. Raise to 100% RC and add an extended-replacement-cost endorsement to absorb construction-cost surprises in a partial loss.
View the TypeScript implementation on GitHub: packages/calc/src/homeowners-coverage-gap.ts · view tests
What this means
Five gap categories evaluated independently; the worst across them is the overall status. The single most common red gap is Coverage A below replacement cost — construction-cost inflation since 2020 has pushed many policies 25–40% under-insured without the homeowner ever changing the policy. The next most common is liability below net worth, especially when no umbrella is carried.
The remediation plan sorts by priority. Priority 1 items are the ones that fail in a way that materially changes claim payouts (co-insurance penalty, missing flood coverage in an SFHA, liability an order of magnitude below net worth). Priority 2 items are meaningful but not catastrophic. Priority 3 is good housekeeping.
Worked example
A 2,500 sq ft home with $240/sq ft local rebuild cost, $500K Coverage A, $300K liability, no umbrella, $750K net worth, in flood zone X with low earthquake risk gets: Coverage A at 83% of the $600K replacement-cost benchmark (yellow — no co-insurance penalty but a total-loss gap), liability at the moderate-tier benchmark ($1M effective vs $1M needed → green at the floor; consider umbrella for headroom), flood and earthquake green. Recommended annual premium impact: ~$50/yr to bring Coverage A to 100% RC and consider a $1M umbrella for $200–500/yr.
Frequently asked questions
The information and tools on this website are for general educational purposes only and do not constitute financial, investment, legal, or tax advice. Consult a licensed professional for decisions specific to your situation.