Extended Coverage Endorsement
Published: October 21, 2026 · Last reviewed: October 21, 2026 · Est. reading time 4 minutes
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In plain language: An extended coverage endorsement is an optional add-on that widens a fire-only policy. The add-on protects a building against wind, hail, explosion, riot, aircraft, vehicles, and smoke, not just fire or lightning.
Technical definition: An extended coverage endorsement attaches to a standard fire insurance policy and adds named perils: windstorm, hail, explosion (except of steam boilers), riot, civil commotion, aircraft, vehicles, and smoke. Modern commercial property causes-of-loss forms include these perils without a separate endorsement.
Extended Coverage Endorsement at a Glance
| Attribute | Detail |
|---|---|
| Also known as | EC endorsement; fire and extended coverage |
| Category | Property coverage endorsement |
| Lines of business | Commercial property; dwelling fire |
| Related forms or endorsements | CP 10 10, CP 10 20, CP 10 30 |
| Also interacts with | Vandalism and malicious mischief coverage |
Key Takeaways
- EC adds named perils, from smoke damage to aircraft crashes, to a fire-only property policy.
- Agencies still meet EC wording in older dwelling forms and lender requirements.
- EC skips water damage and flood; flood insurance needs a separate policy.
- Compare the client's existing policy to lender-required perils, and document the review.
What Is an Extended Coverage Endorsement in Insurance?
An extended coverage endorsement is a property insurance form that broadens a fire policy beyond fire damage. The original standard fire policy covered only fire and lightning, so insurance companies sold EC as a policy add-on for other causes of loss.
Insurance Services Office (ISO) commercial forms now include these perils in the standard policy, while many dwelling insurance basic form editions keep extended dwelling coverage for Coverage A optional. A homeowners insurance policy already includes these covered perils, so homeowners rarely need EC as extra coverage. Wording varies by state, carrier, and edition.
For example, a duplex owner with fire coverage alone has no claim when hail ruins the roof. With EC, the hail damage becomes a covered loss, up to the coverage limit.
How Does an Extended Coverage Endorsement Work?
- The policy update. The agent adds EC as additional coverage, and the carrier charges extra premium.
- The loss. Windstorm or hail damages the property, and the adjuster checks the policy language for exclusions.
- The claims settlement. Payment covers the cost of repairs up to policy limits. Actual cash value subtracts depreciation unless the policy has replacement cost coverage or a replacement cost endorsement.
Claim Examples Involving an Extended Coverage Endorsement
Extra coverage for storm damage to a rental home
A spring windstorm tears shingles off a landlord's rental home. EC on the dwelling fire form pays for the roof and for rain entering through the opening.
Vehicle impacts and other extended coverage perils at a storefront
A delivery truck backs through a gift shop wall. Vehicles are one of the EC perils, so the policy pays to rebuild, although many forms exclude vehicles the insured operates.
Extended Coverage Endorsement vs. Basic Causes-of-Loss Form: What Is the Difference?
EC and ISO's CP 10 10 both list covered causes. The CP 10 10 adds vandalism, sprinkler leakage, sinkhole collapse, and volcanic action. Owners needing more choose the broad form (CP 10 20) or special form (CP 10 30).
| Comparison area | EC endorsement | CP 10 10 |
|---|---|---|
| Primary use case | Older fire and dwelling policies | Current commercial property |
| Coverage/concept type | Endorsement adding named perils | Named-peril form |
| Common mistakes | Assuming theft is covered | Assuming open-peril coverage |
What Are the Most Common Mistakes With an Extended Coverage Endorsement?
- Treating EC as disaster coverage. EC skips earthquake and most natural disasters beyond wind and hail.
- Assuming vandalism or theft is included. Neither sits on the EC list.
- Calling EC a comprehensive endorsement. EC pays only for listed perils.
- Skipping the lender check. Missing additional insurance or perils can trigger force-placed coverage.
Sources and References
- International Risk Management Institute (IRMI). Extended Coverage Endorsement.