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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.

Current policy ($)
Dwelling rebuild benchmark

Replacement cost = sqFt × $/sqFt. Most U.S. metros are $180–$320/sqFt for standard construction; coastal and high-cost markets run higher.

Scheduled-items inventory ($)
Overall coverage status
red

Estimated annual premium impact of all remediations: +$290/yr

Coverage Ayellow
$500,000 on $600,000 RC (83.3%)Shortfall $100,000
Coverage Cgreen
$250,000 (need $250,000)Meets benchmark
Liabilityred
$300,000 effective (need $1,000,000)moderate tier
Floodgreen
Zone X
Earthquakegreen
low seismic risk
Scheduled itemsgreen
All within sub-limits
Prioritized remediation plan
  1. Priority 1 · Liability

    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.

    +$250/yr
  2. Priority 2 · Coverage A

    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.

    +$40/yr
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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.

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Frequently asked questions

See the property-insurance methodology — ISO HO 00 03 form structure, 80% co-insurance, replacement cost vs ACV, scheduled items, lender requirements (Fannie Mae §B7-3), flood (FEMA NFIP) and earthquake context with primary-source citations.

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Founder & Editor, Bedrocka Tools

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.