One of the more consequential but least understood distinctions in property insurance is whether a policy is written as named-perils or all-risk (also called "open-perils"). The two approaches define coverage in fundamentally opposite ways, and the difference can matter enormously at claim time.
Named-perils: covered only if it's on the list
A named-perils policy explicitly lists the specific causes of loss it covers — commonly things like fire, lightning, windstorm, theft, and a defined set of others. If a cause of loss isn't on that list, it generally isn't covered, no matter how reasonable the claim otherwise seems. This structure is common in renters insurance, some older homeowners policies, and personal property coverage even within broader policies.
All-risk / open-perils: covered unless it's excluded
An all-risk policy flips the structure: it covers any cause of loss except those specifically listed as exclusions (flood and earthquake being nearly universal exclusions even in all-risk policies). This generally provides broader protection, since it doesn't require your specific loss to match a predefined list — it only requires that it isn't specifically excluded.
Why the distinction matters more than it seems
An unusual or less common cause of damage — something a named-perils list didn't anticipate — may simply not be covered under a named-perils policy, even if it would have been covered under an all-risk policy's broader default. This is exactly the kind of gap that surfaces only after a claim is filed and denied, not before.
Which type your policy uses (and where they mix)
Many modern homeowners policies use all-risk coverage for the dwelling structure itself, but revert to named-perils coverage for personal belongings — a common and easy-to-miss mixed structure. Checking your specific policy's structure for each coverage section, not just the policy as a whole, is worth doing.
The takeaway
When comparing two policies at similar price points, ask directly whether each coverage section is written as named-perils or all-risk — it's a structural difference that can matter far more than a small premium gap.