HO-3 Policy: The Standard Homeowners Insurance Form

The HO-3 is the most widely used homeowners insurance policy form in the United States, covering the dwelling on an open-perils basis while applying named-perils coverage to personal property. Understanding how this form is structured — what it covers by default, where its boundaries fall, and how it compares to other standard forms — is essential for any homeowner evaluating coverage adequacy. This page addresses the definition, internal mechanics, practical scenarios, and decision thresholds relevant to the HO-3 form.

Definition and scope

The HO-3, formally designated as the Special Form, is one of eight standardized policy forms developed and maintained by the Insurance Services Office (ISO), a Verisk company that publishes model policy language adopted — with state-specific modifications — by insurers across the country. ISO's standardized forms provide a consistent structural foundation, though individual carriers may deviate in endorsements, exclusions, or language.

The HO-3 applies to owner-occupied, single-family dwellings. Its defining structural feature is a split-coverage architecture:

1. Dwelling (Coverage A) and Other Structures (Coverage B): Covered on an open-perils basis, meaning all causes of loss are covered unless explicitly excluded in the policy. Exclusions typically include flood, earthquake, ordinance or law gaps, intentional loss, and war.
2. Personal Property (Coverage C): Covered on a named-perils basis, meaning only perils specifically listed in the policy trigger coverage. Standard named perils include fire, lightning, windstorm, hail, theft, vandalism, and 13 to 16 others depending on the ISO edition.
3. Loss of Use (Coverage D): Pays additional living expenses when the dwelling is uninhabitable due to a covered loss.
4. Personal Liability (Coverage E): Covers legal liability arising from bodily injury or property damage to third parties.
5. Medical Payments to Others (Coverage F): Pays limited medical costs for guests injured on the property, regardless of fault.

State insurance departments regulate policy form approval. In most states, carriers must file forms and endorsements with the state's department of insurance before use, as governed by state insurance codes and, in some cases, the National Association of Insurance Commissioners (NAIC) model laws.

For a broader map of where the HO-3 sits among all residential policy forms, see Homeowners Insurance Policy Forms.

How it works

When a loss occurs, the claims process under an HO-3 follows a defined sequence governed by the policy contract and applicable state law.

Step 1 — Peril determination. For dwelling damage, the insurer must demonstrate that an exclusion applies to deny the claim. For personal property damage, the insured must demonstrate that a listed named peril caused the loss. This asymmetry shifts the burden of proof depending on which coverage section applies.

Step 2 — Valuation. Most HO-3 policies default to replacement cost value (RCV) for the dwelling, meaning the insurer pays the cost to repair or rebuild with like materials at current prices, subject to the policy limit. Personal property under a standard HO-3 is frequently settled at actual cash value (ACV) — replacement cost minus depreciation — unless an endorsement upgrades it to replacement cost. This distinction materially affects claim payouts, particularly for electronics, appliances, and furniture.

Step 3 — Deductible application. The standard deductible applies per occurrence. Certain perils — notably wind and hail in coastal states — may carry a separate percentage deductible expressed as a percentage of Coverage A rather than a flat dollar amount. See Percentage Deductibles Explained for detail on how that calculation works.

Step 4 — Coverage limits and sublimits. Coverage B (other structures) is typically set at 10% of Coverage A by default. Coverage C (personal property) defaults to 50–70% of Coverage A. High-value categories such as jewelry, firearms, and silverware carry per-item and per-category sublimits under standard HO-3 forms — often $1,500 for jewelry theft per ISO's standard language — which frequently require Scheduled Personal Property Endorsements to cover adequately.

Common scenarios

Scenario 1 — Wind damage to the roof. Wind is a covered open peril for Coverage A. If wind removes shingles and water enters, both the direct wind damage and resulting water intrusion are typically covered, provided the water damage was sudden and accidental rather than the result of deferred maintenance. The insurer bears the burden of proving an exclusion applies.

Scenario 2 — Theft of personal property. Theft is a named peril under Coverage C. An HO-3 covers theft of personal property both on and off premises, though off-premises limits are typically capped at 10% of Coverage C under standard ISO language. Items stored in a vehicle are a frequent gray area governed by specific policy language.

Scenario 3 — Guest injury on the premises. Coverage F (medical payments) applies regardless of fault, typically in limits of $1,000 to $5,000. If the injury results in a lawsuit alleging negligence, Coverage E (liability) responds. Certain animals, notably dog breeds flagged by underwriters, may be excluded from liability coverage — see Dog Bite Liability Homeowners for how breed exclusions operate.

Scenario 4 — Flood or earthquake loss. Neither flood nor earthquake is a covered peril under a standard HO-3. Flood coverage requires a separate policy, typically through the National Flood Insurance Program (NFIP) administered by FEMA. Earthquake coverage requires a separate endorsement or standalone policy — see Earthquake Insurance Endorsement.

Decision boundaries

The HO-3 is appropriate for owner-occupied, single-family dwellings where the owner wants broad dwelling protection without the premium associated with fully open-perils personal property coverage. Key thresholds that should trigger consideration of alternative forms or endorsements:

• High personal property value: The HO-5 form extends open-perils coverage to personal property as well as the dwelling. For households with significant personal property — fine art, jewelry, electronics — the HO-5 Policy eliminates the named-perils limitation on Coverage C.
• Condominium ownership: The HO-3 is not designed for condominiums. The HO-6 form addresses the unit-owner's insurable interest, which begins at the interior walls rather than the full structure.
• Renters: The HO-3 does not apply to renters, who have no insurable interest in the dwelling itself. The HO-4 form covers personal property and liability for tenants.
• Older or high-replacement-cost homes: Homes where rebuilding costs exceed market value, or where local ordinances would require code upgrades during reconstruction, may need Ordinance or Law Coverage and potentially Guaranteed Replacement Cost provisions.
• Homes with business activity: Standard HO-3 forms exclude or sharply limit coverage for business property and business liability on premises. A separate Home-Based Business Insurance policy or endorsement is required.
• Vacancy: An HO-3 typically contains a vacancy clause suspending certain coverages — commonly vandalism and glass breakage — after 30 to 60 consecutive days of vacancy. Properties unoccupied beyond that threshold require a Vacant Home Insurance policy.

The named-perils versus open-perils distinction is the structural axis around which HO-3 coverage decisions turn. A detailed comparison of these frameworks is available at Named Perils vs Open Perils. Coverage gaps that fall outside the HO-3's scope are covered in Homeowners Insurance Exclusions.

References

• Insurance Services Office (ISO) — Verisk
• National Association of Insurance Commissioners (NAIC) — Consumer Resources
• FEMA National Flood Insurance Program (NFIP)
• NAIC Homeowners Insurance Model Act
• U.S. Government Accountability Office — Homeowners Insurance Market Overview