12 min read
Top 5 Home Insurance Myths
Most homeowners do not learn what their policy actually covers until they file a claim. By then it is too late. After...
HOME INSURANCE
How Much Home Insurance Do I Need?
The most common home insurance mistake is insuring to what the house would sell for instead of what it would cost to rebuild. Those are different numbers, and the gap shows up as a reduced claim payment.
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- How Much Insurance Do I Need
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Quick Answer: Insure the dwelling at full replacement cost, which is what it costs to rebuild today, not market value and not your mortgage balance. Most policies contain a coinsurance clause requiring at least 80 percent of replacement cost, and falling below it reduces every claim payment. Personal property is typically set at 50 to 75 percent of the dwelling limit, and liability is commonly recommended at $300,000 to $500,000.
Market value includes land, location and what a buyer will pay. Replacement cost is materials and labor to rebuild the structure, and it excludes land entirely. In some markets replacement cost is higher than market value, in others lower. Either way, using the wrong number is what creates the gap.
Replacement cost vs market value
| Replacement cost | Market value | |
|---|---|---|
| What it is | Cost to rebuild the structure today | What a buyer would pay for the property |
| Includes land | No | Yes |
| Driven by | Materials, labor, code requirements | Location, school district, market demand |
| Use it for | Your dwelling limit | Selling the house |
Your mortgage balance is a third, unrelated number. Lenders sometimes require coverage equal to the loan, which can leave the structure underinsured.
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Get My Coverage Health ScoreThe 80 percent rule, and what it costs to get wrong
Most homeowners policies contain a coinsurance clause requiring the dwelling to be insured at a minimum of 80 percent of full replacement cost. Fall below it and the insurer does not simply pay less on total losses, it pays a reduced share of every claim.
The math on a partial loss, worked through
Take a home with a replacement cost of $400,000. The 80 percent requirement means it must carry at least $320,000 of dwelling coverage.
Suppose it is insured at $240,000 instead, and a kitchen fire causes a $50,000 loss.
The insurer divides actual coverage by required coverage: $240,000 divided by $320,000 equals 75 percent.
So the claim pays 75 percent of $50,000, which is $37,500, before the deductible comes out.
The point: this was a $50,000 partial loss, nowhere near a total loss, and the penalty still applied. Underinsurance is not only a total-loss problem.
How the rest of the policy is sized
| Coverage | Typical setting | What to check |
|---|---|---|
| Dwelling (Coverage A) | Full replacement cost | Re-run the rebuild estimate after renovations or a few years of inflation |
| Other structures | A percentage of the dwelling limit | Detached garage, fence, shed, pool house |
| Personal property | Typically 50 to 75 percent of dwelling | Jewelry, art and collectibles usually need scheduling beyond the standard sublimit |
| Loss of use | A percentage of the dwelling limit | Covers somewhere to live while the home is rebuilt |
| Personal liability | $300,000 to $500,000 commonly recommended | Also the base an umbrella policy sits on |
Four endorsements worth asking about
Extended or guaranteed replacement cost
Adds a cushion above the dwelling limit when rebuild costs spike after a widespread event. The single most useful protection against an outdated limit.
Water and sewer backup
Excluded by default on most policies. Common and expensive, especially in older housing stock served by combined sewers.
Ordinance or law
Pays the added cost of rebuilding to current code. On an older home this gap can be substantial after a serious loss.
Flood
Never included in a homeowners policy. Needs a separate flood policy, and most flood claims happen to properties that were not required to carry it.
Have us re-run your rebuild number
Send your declarations page. We will compare your dwelling limit against a current replacement cost estimate, free.
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Home Insurance Limits FAQ
How much dwelling coverage do I need?
Enough to rebuild the structure at today's costs, which is replacement cost, not market value and not your mortgage balance. Most policies require at least 80 percent of full replacement cost to avoid a coinsurance penalty, so building in a margin above that threshold is the safer position.
What is the 80 percent rule in home insurance?
It is a coinsurance requirement that your dwelling be insured for at least 80 percent of its full replacement cost. If coverage falls below that, the insurer pays a proportionally reduced share of claims. Insured at 75 percent of the required amount, a $50,000 loss pays $37,500 before the deductible.
How much personal property coverage do I need?
Standard policies set personal property at roughly 50 to 75 percent of the dwelling limit automatically. That default is rarely checked against what someone actually owns. High value items such as jewelry, watches, art and collectibles usually exceed category sublimits and need to be scheduled separately.
Is replacement cost the same as market value?
No. Replacement cost is what it takes to rebuild the structure with current materials and labor, and it excludes land. Market value is what a buyer would pay for the property including land and location. Using market value to set a dwelling limit is the most common way homes end up underinsured.
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DR
Reviewed by Dave Rysavy
VP, Personal Lines · Pro Insurance Group. Dave places homeowners coverage and reviews dwelling limits against current rebuild costs for clients across 40-plus states.
General information, not advice. Coverage needs depend on your assets, household and state. The figures here are widely cited planning benchmarks, not a recommendation for your specific situation. A licensed Pro Insurance Group advisor will review your actual exposure before any coverage is placed.
Sources: 80 percent coinsurance rule, worked example and replacement cost vs market value, Liberty Mutual. · Personal property percentage range, Plymouth Rock Assurance. Verified July 2026.
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