Written by Justin Goodman, CIC, CISC, CLCS, CEO and Co-Founder, Total CSR Published: October 6, 2026 · Last reviewed: October 6, 2026
In plain language: Specified Cause of Loss means a policy pays only for damage caused by perils the insurer specifically names, like fire, lightning, or windstorm. If a loss happens for a reason not on that list, the policy does not pay, even if the damage is real and severe.
Technical definition: Specified Cause of Loss refers to a named-perils coverage structure, most commonly implemented through ISO’s Causes of Loss – Basic Form (CP 10 10) or Broad Form (CP 10 30), where coverage applies only to direct physical loss resulting from perils enumerated in the policy, unlike open-perils forms that cover all risks except those excluded.
Specified Cause of Loss at a Glance
| Attribute | Detail |
|---|---|
| Also known as | Named Perils Coverage, Specified Perils Form |
| Category | Property policy coverage form |
| Lines of business | Commercial Property, Businessowners Policy (BOP), Homeowners |
| Industries most affected | Retail, Manufacturing, Real Estate, Hospitality, Habitational |
| Related forms or endorsements | CP 10 10 (Basic Form), CP 10 30 (Broad Form) |
| Who bears the risk | Policyholder, for any loss cause not explicitly listed |
| Common solution | Upgrade to Causes of Loss – Special Form (CP 10 30… actually CP 10 30 is Broad; Special is CP 10 30 variant) for open-perils protection |
| Also interacts with | Open Perils Coverage, Direct Physical Loss, Exclusions |
Key Takeaways
- Specified Cause of Loss is a coverage form that pays claims only when the damage results from a peril the policy specifically names, such as fire, hail, or vandalism.
- Agencies must confirm which Causes of Loss form attaches to a commercial property policy, because the difference between named perils and open perils determines whether an unusual loss gets paid at all.
- The most common misunderstanding is assuming a “named perils” policy covers anything not specifically excluded, when in fact the opposite is true: only listed perils are covered, and everything else is automatically out.
- Agencies reduce E&O exposure by documenting, in writing, which Causes of Loss form was quoted, presented, and selected, along with any client decision to decline broader coverage.
What Is Specified Cause of Loss in Insurance?
Specified Cause of Loss is a foundational concept in commercial property insurance that defines coverage by listing the exact perils a policy will respond to, rather than covering all risks and excluding specific ones. ISO built this structure into the Causes of Loss – Basic Form (CP 10 10), which typically lists perils including fire, lightning, explosion, windstorm or hail, smoke, aircraft or vehicles, riot or civil commotion, vandalism, and sprinkler leakage. The Broad Form (CP 10 30) adds a few more perils, such as falling objects, weight of snow or ice, and certain water damage scenarios.
The structure exists because insurers want precise, measurable exposure. A named-perils list lets an underwriter price a policy around known, enumerable risks instead of guessing at every conceivable cause of loss. This approach sits in contrast to the legal doctrine behind open-perils (sometimes called “all-risk”) forms, which shift the burden of proof: under a specified cause of loss form, the insured must prove the loss falls within a listed peril, while under an open-perils form, the insurer must prove an exclusion applies.
Consider a warehouse owner whose roof collapses under the weight of accumulated rainwater pooling on a flat roof. Under the Basic Form, “weight of snow, ice, or sleet” is covered, but weight of rainwater is not listed. The claim gets denied. Under the Broad Form, the same scenario may still fail unless the specific water-weight language applies. Only a Special Form, which covers risks of direct physical loss unless excluded, would likely respond.
How Does Specified Cause of Loss Work?
- The policy selection. The agent and insured choose a Causes of Loss form, Basic, Broad, or Special, and that choice determines whether coverage operates on a named-perils or open-perils basis.
- The loss event. Physical damage occurs to covered property, triggering the need to identify what caused it.
- The peril identification. The adjuster investigates the cause of loss and checks it against the specific list of perils named in the attached Causes of Loss form.
- The match or mismatch. If the cause matches a listed peril, such as fire or windstorm, the claim proceeds to valuation and payment. If the cause is not listed, the adjuster denies the claim regardless of the damage severity.
- The appeal or dispute. The insured may dispute the denial by arguing the loss actually falls under a listed peril, often requiring expert reports on causation.
Real Claim Examples Involving Specified Cause of Loss
Warehouse roof collapse from rainwater pooling
A distribution center carried the Causes of Loss – Basic Form on its commercial property policy. Heavy rain pooled on a poorly draining flat roof, and the accumulated weight caused a structural collapse. The adjuster denied the claim because “weight of rainwater” was not among the perils listed in the Basic Form, which only names weight of snow, ice, or sleet. The business owner had no recourse because no broader form was in place, resulting in a six-figure uninsured loss.
Vandalism damage at a vacant retail strip center
A strip mall owner held coverage under the Broad Form while one unit sat vacant during a tenant transition. Vandals broke in and damaged fixtures and plumbing. Vandalism is a named peril under both Basic and Broad forms, so the claim paid in full. The outcome would have differed had the building exceeded the policy’s vacancy period without a vacancy permit endorsement, since vandalism coverage often suspends after 60 days of vacancy.
Water damage from a burst pipe during a cold snap
A restaurant owner with the Basic Form suffered a burst pipe during an unusual freeze, flooding the kitchen. The Basic Form does not list “accidental discharge of water” as a covered peril, only the Broad and Special forms include that protection in varying degrees. The claim was denied, and the client later learned the agency had quoted the Special Form but the client had downgraded to save premium, a decision documented in the file that protected the agency from an E&O claim.
Specified Cause of Loss vs. Open Perils Coverage: What Is the Difference?
Specified Cause of Loss and Open Perils Coverage represent the two fundamental structures for commercial property policies, differing in how they define what is covered rather than in what property they apply to. The table below compares the two approaches directly.
| Comparison area | Specified Cause of Loss | Open Perils Coverage |
|---|---|---|
| Primary use case | Lower-cost property coverage for predictable, listed risks | Broader protection for businesses wanting fewer coverage gaps |
| Coverage / concept type | Named-perils form (CP 10 10 or CP 10 30) | Risks of direct physical loss unless excluded (Special Form) |
| Typical exclusions | Anything not on the named list | Specific named exclusions, such as flood, earth movement, wear and tear |
| Who is most affected by errors | Policyholders facing denial for unlisted causes | Carriers facing broader claims exposure |
| Common mistakes | Assuming unlisted perils are covered by default | Assuming “all-risk” means literally all risks with no exclusions |
What Are the Most Common Mistakes With Specified Cause of Loss?
- Agencies sometimes use the term “all-risk” loosely in client conversations about a named-perils policy, creating a false expectation that gets exposed at claim time.
- Producers occasionally fail to document that a client was offered and declined the Special Form in favor of a cheaper Basic or Broad Form, leaving the agency exposed if a claim is denied.
- CSRs sometimes assume the Basic and Broad forms list identical perils, when the Broad Form actually adds several, including falling objects and weight of snow, ice, or sleet.
- Account managers occasionally overlook that named perils forms still require the loss to be “direct physical loss,” so even a listed peril like windstorm will not cover indirect or consequential damage without additional coverage.
- Agencies sometimes forget that vandalism and theft coverage under named-perils forms often suspends after a defined vacancy period, a detail easy to miss during policy review.
How to Explain Specified Cause of Loss to a Client
Explaining Specified Cause of Loss to a personal lines client
Your homeowners policy may list the specific things it covers, like fire, lightning, or windstorm, instead of covering everything except a short exclusion list. That means if your damage comes from something not on that list, the policy will not pay, so it matters which type of policy you carry. I can pull up your declarations page right now and walk through exactly what’s listed.
Explaining Specified Cause of Loss to a small business owner
Your commercial property policy covers losses caused by specific named perils, things like fire, windstorm, and vandalism, rather than covering every possible cause of damage. This keeps your premium lower, but it also means a loss from an unlisted cause, like certain types of water damage, might not be covered. Let’s review your form together so there are no surprises if something happens.
Explaining Specified Cause of Loss to a CFO or risk manager
Your property schedule currently operates on a named-perils basis using the ISO Causes of Loss form, which means coverage triggers only for perils explicitly listed rather than all risks of direct physical loss. This creates a gap for causes of loss outside that list, and given your facility’s exposure profile, I’d recommend quantifying the cost difference to move to a Special Form. I can model the premium delta against your probable maximum loss so you can make an informed risk-financing decision.
Frequently Asked Questions About Specified Cause of Loss
What perils are typically included in a Specified Cause of Loss form?
The ISO Causes of Loss – Basic Form (CP 10 10) typically lists fire, lightning, explosion, windstorm or hail, smoke, aircraft or vehicles, riot or civil commotion, vandalism, and sprinkler leakage, among others. The Broad Form (CP 10 30) adds additional perils such as falling objects, weight of snow or ice, and certain accidental water discharge scenarios. Always confirm the exact list on the specific edition attached to the policy, since ISO periodically revises form language.
Is Specified Cause of Loss the same as named perils coverage?
Specified Cause of Loss and named perils coverage describe the same underlying concept and are often used interchangeably in the industry. Both terms refer to coverage that applies only to losses caused by perils explicitly enumerated in the policy. The ISO forms themselves use the phrase “Causes of Loss” rather than “named perils,” but agents commonly use both terms in client conversations.
Why would a business choose Specified Cause of Loss over an open perils form?
Cost is the primary driver, since named-perils forms generally carry lower premiums than Special Form or open-perils coverage. A business with a straightforward risk profile and tight insurance budget may accept the narrower coverage as a reasonable trade-off. The decision should always be documented in the agency file, especially when the client declines a broader option that was quoted.
Can a Specified Cause of Loss policy be upgraded later?
Yes, a policyholder can typically upgrade from a Basic or Broad Form to a Special Form at any renewal or, in some cases, midterm with an endorsement. The upgrade usually increases premium because it shifts the coverage trigger from a defined list to all risks of direct physical loss unless excluded. Agencies should proactively offer this option at each renewal review, particularly after a near-miss loss that exposed a gap.
Does a Specified Cause of Loss form cover flood or earthquake damage?
No, flood and earthquake are not included in the standard list of perils under either the Basic or Broad Causes of Loss forms. These exposures require separate policies or endorsements, such as a National Flood Insurance Program policy or a difference-in-conditions policy. This gap exists under both named-perils and most open-perils forms, since flood and earthquake are typically excluded even from Special Form coverage.
What happens if an insured cannot prove which peril caused the loss?
Under a Specified Cause of Loss form, the burden falls on the insured to demonstrate the loss resulted from a listed peril, and an inconclusive cause of loss often leads to denial. This differs from open-perils coverage, where the insurer bears the burden of proving an exclusion applies. This burden-of-proof distinction is one of the most significant practical differences between the two coverage structures and often decides contested claims.
Related Insurance Terms
- Open Perils Coverage: A property coverage structure, often called the Special Form, that covers all risks of direct physical loss except those specifically excluded, the functional opposite of Specified Cause of Loss.
- Named Perils Policy: Another term for a Specified Cause of Loss policy, used interchangeably to describe coverage limited to an enumerated list of covered causes of loss.
- Direct Physical Loss: The foundational trigger requirement in most property policies, including Specified Cause of Loss forms, requiring tangible, measurable damage to covered property before a claim can be considered.
- Causes of Loss Form: The ISO policy form, issued in Basic, Broad, or Special versions, that attaches to a commercial property policy and defines whether coverage operates on a named-perils or open-perils basis.
- Exclusion: A policy provision that removes coverage for a specific cause or type of loss, functioning as the mirror image of a Specified Cause of Loss list since exclusions narrow open-perils coverage rather than define named perils.
- Vacancy Permit Endorsement: An endorsement that preserves certain coverages, including vandalism under named-perils forms, when a building sits vacant beyond the policy’s standard vacancy limitation period.
Sources and References
- National Association of Insurance Commissioners. Model Regulation Reference to ISO Causes of Loss Forms.
About the Author
Justin Goodman, CIC, CCIP, CISC, CLCS, CRIS, PCIA, QCLS, MFHR CEO and Co-Founder, Total CSR, Inc.
Justin Goodman is a third-generation insurance broker with over two decades in agency operations. He has trained more than 100,000 CSRs, account managers, and producers in commercial and personal lines coverage, from workers’ compensation to construction risk. He was named 2024 Insurance Journal Agent of the Year and one of the nation’s top five construction insurance experts by Risk & Insurance. He is the author of Retain, which applies cognitive science research on memory and knowledge transfer to insurance training, and speaks nationally on how agencies build durable technical expertise in their teams.