How Much Homeowners Insurance Do I Need?
The most expensive mistake in homeowners insurance isn’t overpaying — it’s being underinsured and not finding out until after a total loss. The figure on your mortgage statement is the wrong starting point.
Dwelling coverage = rebuild cost, not market price
Coverage A should equal what it costs to rebuild from the ground up — not market value (includes land/location), mortgage balance (a loan figure), or purchase price. A fire destroys the structure, not the land: a $500,000 home on a $150,000 lot needs ~$350,000 of structure coverage. Rebuild cost is driven by local construction labor/materials/size/finishes — the same forces in average cost by state. After widespread disasters, “demand surge” lifts rebuild costs, so many policies add extended replacement cost (often +25–50% above the stated limit).
Replacement cost vs actual cash value
| Replacement cost | Actual cash value (ACV) | |
|---|---|---|
| Pays | Repair/replace, like materials | Replacement minus depreciation |
| Older items | In full | Less, due to wear |
| Out-of-pocket gap | Low | Can be large |
A 15-year-old roof under ACV pays depreciated value (a fraction of a new roof). Confirm which your policy uses.
The 80% rule
To collect the full amount on a partial loss, insure to ≥80% of full replacement cost (coinsurance). Underinsure and the insurer prorates partial claims. Example: full replacement $400,000; 80% threshold $320,000; you carried only $240,000 → a $40,000 fire is paid roughly by the carried-vs-required ratio, leaving a shortfall. Insure to 100% of replacement cost if you can.
Other coverages (typically % of dwelling)
- Personal property (C): 50–70% of dwelling; schedule jewelry/art/collectibles above sub-limits.
- Other structures (B): ~10%.
- Loss of use (D): ~20%.
- Liability (E): many carry $300,000–$500,000; add an umbrella if assets exceed that.
- Medical payments (F): ~$1,000–$5,000.
Set personal property to replacement cost too.
What it doesn’t cover
Flood excluded (flood vs homeowners); earthquake typically excluded; maintenance/wear never covered; title is a separate product (title insurance).
Checklist
Get a replacement-cost estimate → set dwelling to 100% (+ extended replacement) → choose replacement cost not ACV → liability $300k–$500k + umbrella if needed → schedule high-value items → add flood/earthquake if exposed. Premium is often collected via escrow.
Frequently Asked Questions
Should it equal market value?
No — dwelling = rebuild cost, not market value or mortgage balance.
The 80% rule?
Insure to <80% of replacement and partial claims get prorated.
Replacement cost vs ACV?
Replacement pays without depreciation; ACV subtracts it.
How much liability?
Commonly $300k–$500k, plus umbrella if assets are larger.
CTA: Get a replacement-cost estimate, set dwelling to match, and benchmark against average cost by state.
Sources: Insurance Information Institute (III) — replacement cost vs ACV, HO-3 structure/sub-limits; NAIC — coinsurance/80% rule, dwelling-coverage and liability guidance.