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Home insurance coverage planning worksheet

Home Insurance Coverage Estimator

Start with a property-specific estimate of what it could cost to rebuild the dwelling—not its sale price or mortgage balance. Apply the percentages actually shown in a policy or quote, inspect the resulting limits separately, calculate a percentage deductible, and flag special property and catastrophe coverage for a document-based review.

Insurance calculator Content updated 2026-08-16Calculations run privately in your browser

Written by and Content updated: 2026-08-16

Authorship scope and limitations

Cindy Zhang and Heather Kincaid co-authored the reconstruction-cost explanation, policy-percentage arithmetic, inventory prompts, catastrophe reminders, worked example, limitations, and links to NAIC and National Flood Insurance Program resources. This is an editorial authorship scope, not a claim of appraisal, construction-cost, actuarial, insurance-agent, producer, underwriting, inspection, claims, legal, lending, or state-regulatory review.

The byline does not claim professional credentials, trade, finance, insurance, actuarial, underwriting, or claims experience, licensed review, or independent professional review for either author.

Enter reconstruction and policy assumptions

Example values are prefilled
Dwelling and related policy percentages

Copy a current reconstruction estimate and the exact percentages from a declarations page or quote. Defaults illustrate common worksheet arithmetic, not recommended limits.

$

Use a current property-specific estimate for rebuilding with like-kind materials. Do not substitute market value, land value, purchase price, tax assessment, or mortgage balance.

% of dwelling

Copy the percentage for detached garages, sheds, fences, or other structures from the candidate policy. The NAIC guide lists 10% as typical, but actual forms and needs differ.

% of dwelling

Copy the percentage shown in the candidate policy, then compare the result with a room-by-room inventory. Category sublimits and replacement-cost terms can matter.

% of dwelling

Copy the policy percentage for additional living expense or loss of use. Time limits, covered causes, and eligible expenses can restrict this coverage.

Liability, deductibles, and special property

These are distinct coverage lines. The calculator does not combine them into one total payout.

$

Enter the limit from the candidate quote or policy. Liability coverage, exclusions, defense provisions, and umbrella policies require a separate needs discussion.

$per person

Copy the candidate limit. This coverage is separate from personal liability and does not ordinarily cover an insured's own medical expenses.

% of dwelling

Enter a percentage only when a policy or quote expresses the relevant deductible that way. Dollar deductibles and catastrophe-specific deductibles require separate review.

$

Total jewelry, art, collectibles, business property, electronics, firearms, or other items that may face category sublimits. This value is flagged for review and is not added to a payout total.

Separate catastrophe review

Checking a box records a review step only. It does not add insurance or confirm that a peril is covered.

Most homeowners insurance does not cover flood damage. Use official flood-risk information and review building and contents coverage separately; checking this box does not purchase or verify coverage.

Standard policy treatment and separate earthquake products or endorsements vary. Checking this box is only a reminder that a review occurred.

This educational worksheet is not a premium quote, appraisal, inspection, insurer valuation, policy recommendation, underwriting decision, or coverage determination.

How to use this home coverage calculator

Turn a dwelling reconstruction estimate into separate other-structures, personal-property, loss-of-use, deductible, liability, and special-item review amounts.

Formula

Other structures amount = dwelling reconstruction estimate × entered other-structures percentage. Personal property amount and loss-of-use amount use their respective entered percentages. Modeled percentage deductible = dwelling reconstruction estimate × entered deductible percentage. Liability, medical payments, and special-items inventory remain separate review lines and are never summed as a promised payout.

Quick example

Example: A $400,000 dwelling reconstruction estimate with entered policy ratios of 10% other structures, 50% personal property, and 20% loss of use produces worksheet amounts of $40,000, $200,000, and $80,000. A 1% modeled deductible equals $4,000. Each amount must be checked separately against the policy and actual property needs.

Accuracy and limitations

This is percentage arithmetic, not a replacement-cost estimator generated from construction data. It does not model square footage, local labor or materials, demolition, debris removal, design fees, code upgrades, inflation, demand surge, extended or guaranteed replacement cost, depreciation, coinsurance, category sublimits, scheduled property, loss-settlement terms, covered perils, exclusions, mortgage requirements, or claim payment. Policy forms, catastrophe deductibles, availability, and state rules vary.

Sources and formula references

Choose and verify your inputs

Obtain a reconstruction estimate

Ask an insurer, qualified reconstruction-cost professional, or other appropriate local source for a current estimate that reflects the actual structure and local building costs. Remove land value from the question: a property's sale price and its cost to reconstruct are different measures.

Copy percentages from the policy

Other structures, personal property, and loss of use are often expressed as percentages of the dwelling limit. The NAIC guide supplies typical examples, but your declaration and policy form control; type those actual percentages into the worksheet.

Build a home inventory

Document rooms, belongings, purchase details, serial numbers, receipts, photographs, and off-premises property where practical. Compare the inventory with the displayed personal-property amount and examine category sublimits and loss-settlement terms.

Interpret the deductible correctly

A percentage deductible may be applied to a dwelling limit rather than to the loss itself. Wind, named-storm, hurricane, earthquake, or other catastrophe deductibles may differ from the all-peril deductible; copy the relevant policy language.

Review excluded or separately insured hazards

Most homeowners insurance does not cover flood damage, according to the National Flood Insurance Program. Earthquake, sewer backup, ordinance or law, water, wildfire, wind, and other exposures require property- and policy-specific review.

How the calculation works

Anchor the worksheet to reconstruction cost

Use the entered dwelling reconstruction estimate as the arithmetic base without adding land value, mortgage balance, or market appreciation.

Calculate each related limit

Multiply the dwelling amount by each entered percentage to display separate other-structures, personal-property, and loss-of-use planning amounts.

Calculate the percentage deductible

Convert the entered percentage to a decimal and multiply by the dwelling amount. A 1% deductible against $400,000 is $4,000, not 1% of a later repair invoice.

Keep liability and medical payments independent

Display the two user-entered limits without deriving them from dwelling value. They address different exposures and cannot be validated by property-value arithmetic.

Flag special items and catastrophe reviews

Show the special-items inventory as a document-review prompt and surface an incomplete-review warning when flood or earthquake boxes remain unchecked. No amount is automatically added to coverage.

Worked calculation: Assume a property-specific dwelling reconstruction estimate of $400,000. A candidate declaration lists other structures at 10% of dwelling, personal property at 50%, loss of use at 20%, personal liability at $300,000, medical payments to others at $5,000, and a modeled percentage deductible of 1%. A preliminary inventory flags $25,000 of special items for sublimit review.

  1. Multiply $400,000 by 10% to display a separate $40,000 other-structures amount.
  2. Multiply $400,000 by 50% to display a separate $200,000 personal-property amount, then compare it with the room-by-room inventory and loss-settlement terms.
  3. Multiply $400,000 by 20% to display a separate $80,000 loss-of-use amount. Do not assume this removes a policy time limit or covered-loss requirement.
  4. Multiply $400,000 by 1% to display a $4,000 deductible scenario. Confirm that the actual policy uses dwelling coverage as the base and determine which peril the deductible applies to.
  5. Keep the $300,000 liability limit, $5,000 medical-payments limit, and $25,000 special-items inventory as separate review lines rather than adding all seven numbers into a misleading total.
Result: The worksheet produces four checkable calculations: $40,000 other structures, $200,000 personal property, $80,000 loss of use, and a $4,000 modeled percentage deductible. It does not conclude that any amount is adequate or payable.

Next step: Replace the example with a current reconstruction estimate and exact quote percentages, reconcile the inventory and special categories, compare identical policy forms, and complete separate flood, earthquake, and local-hazard reviews.

Interpret the result

Dwelling amount is only as reliable as its source

The calculator accepts, but does not create or validate, the reconstruction estimate. Update the source after renovations, major material-price changes, code changes, or other property changes.

Percentage-derived lines are not interchangeable

Unused other-structures, contents, or loss-of-use limits generally cannot be assumed to increase a different coverage. Read the policy for how each line operates.

Inventory can contradict a percentage

If the documented belongings or detached structures exceed a percentage-derived amount, that difference is a reason to review the quote. Special categories may be limited even when the overall contents amount appears large.

Deductible is household exposure

The displayed percentage deductible helps test whether cash reserves could absorb one covered loss. A real claim can include uncovered damage, depreciation, sublimits, or multiple deductibles beyond this simple result.

Review boxes prove nothing about coverage

The flood and earthquake controls are reminders only. A checked box does not establish risk, eligibility, effective dates, limits, deductibles, or that a policy covers the peril.

Common mistakes to avoid

  • Using market value, purchase price, assessed value, land value, or mortgage balance as though it were dwelling reconstruction cost.
  • Leaving default percentages in place instead of copying the current declaration and policy form.
  • Assuming replacement-cost language removes every cap, condition, depreciation step, or documentation requirement.
  • Treating one overall contents value as proof that jewelry, art, business property, electronics, or other categories have adequate sublimits.
  • Reading a 1% deductible as 1% of the claim rather than checking the policy's stated deductible base.
  • Assuming standard homeowners insurance covers flooding, earthquakes, sewer backup, every type of water loss, or every wind event.

Decision checklist

  • Obtain a dated, property-specific reconstruction estimate and ask what costs and building features it includes.
  • Compare quotes using the same dwelling basis, coverage form, loss-settlement method, limits, deductibles, endorsements, and effective date.
  • Complete a room-by-room inventory and separately list items subject to category limits or scheduling.
  • Review detached structures, additional living expenses, liability activities, pets, household workers, home business, rentals, and umbrella coordination.
  • Use official maps and qualified sources to review flood, earthquake, wind, wildfire, sewer-backup, and ordinance-or-law exposures.
  • Ask a licensed insurer or producer to explain exclusions, percentage deductibles, replacement-cost conditions, mortgagee provisions, and claim documentation in writing.

Frequently asked questions

Should dwelling coverage equal my home's market value?

Not necessarily. NAIC guidance distinguishes replacement cost—the cost to rebuild with similar materials—from market value, which includes land and depends on the real-estate market. Obtain a property-specific reconstruction estimate.

Does the calculator estimate rebuilding cost from square footage?

No. A reliable estimate can depend on the structure, finish, labor, materials, demolition, debris, code, design, access, and local demand. Enter a current estimate from an appropriate property-specific source.

Why are personal property and loss of use percentages?

Many policy declarations express these limits as a percentage of dwelling coverage. The defaults demonstrate arithmetic only. Copy the percentages in the actual quote and read its form, sublimits, and conditions.

Does a high personal-property limit fully cover jewelry or collectibles?

Not necessarily. Theft or other category sublimits, valuation rules, exclusions, and scheduling requirements can apply. Use the special-items field as a reminder to review each category.

Does homeowners insurance include flood coverage?

Most homeowners insurance does not cover flood damage, according to the National Flood Insurance Program. Review official flood-risk information and building and contents options separately.

Does checking the flood or earthquake box add coverage?

No. It records a planning step only. Coverage exists only through the applicable policy or endorsement after its effective date and subject to its limits, deductibles, exclusions, and conditions.

How does the percentage deductible calculation work?

The tool multiplies the entered dwelling estimate by the entered percentage. Confirm the base and peril in the policy because all-peril, wind, hurricane, named-storm, and earthquake deductibles can differ.

Does the result include an umbrella policy?

No. Personal liability is shown as one user-entered line. Ask how underlying home and auto limits coordinate with any umbrella or excess policy.

Is this a homeowners insurance quote?

No. The tool has no rating or underwriting model and does not collect an insurance application. Obtain itemized quotes using consistent limits, forms, deductibles, endorsements, property facts, and dates.

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