Almost every property policy resolves to one of two sentence structures. The sentence is short, it sits at the top of the coverage section, and most owners have never read it.
Named perils reads something like this. We insure for direct physical loss to the property described in Coverage A caused by any of the following perils. Then comes a numbered list.
Open perils reads like this. We insure against risk of direct physical loss to property described in Coverage A. Then comes a list of exclusions.
Those two sentences look like a formatting choice. They are the most consequential difference in the contract.
The burden of proof moves
Under a named-perils form, you carry the burden. When you file a claim, you are asserting that what happened to your property matches something on the list. If the cause is unclear, or unusual, or does not fit any listed peril cleanly, the claim fails. Not because the carrier is acting in bad faith. Because the contract only promised those specific causes.
Under an open-perils form, the burden sits with the carrier. Loss is presumed covered. To deny it, the adjuster has to identify a specific exclusion and show it applies to the facts.
Most claims never test this. A house fire is fire. A tree through the roof is windstorm. Both forms pay.
The difference appears in the murky claims, and short-term rentals generate a lot of murky claims, because a stream of strangers moves through the property doing things nobody witnesses.
What that looks like in a real loss
A guest checks out. Your cleaner walks in and finds a hole punched through the drywall in the stairwell and a two-foot gouge across the hardwood in the hall. The guest says nothing. Best guess is a sectional sofa or a piece of luggage on the way down the stairs. Repair estimate comes back at $6,800.
On a named-perils dwelling form, you go looking for the peril. Vandalism is the closest fit, and it does not apply. Vandalism requires willful damage, this looks accidental, and many forms exclude vandalism caused by a tenant or occupant anyway. Nothing else on the list describes a guest dragging furniture. The claim is denied, and the denial is correct under the contract you bought.
On an open-perils form, the analysis reverses. The adjuster asks whether an exclusion applies. Wear and tear does not fit, because this was sudden. Marring and scratching might catch the floor gouge depending on the language and the adjuster. The hole in the drywall is sudden accidental physical damage, and there is no exclusion pointed at it.
Same loss. Same property. Same $6,800. One form pays and one does not, and the reason has nothing to do with how good your carrier is.
Open perils is not all perils
This is where owners overcorrect. Getting to a special form is a real improvement, and it is not a cure. The exclusion list is where all the work happens, and it is long.
The standard exclusions cut deep. Earth movement. Water damage, which sweeps in flood, surface water, and sewer backup unless it is bought back. Ordinance or law. Power failure. Neglect. Intentional loss.
Then there is a second group most people never read, and it is the group that actually applies to rental property. Wear and tear. Deterioration. Mechanical breakdown. Rust and corrosion. Mold. Settling and cracking of foundations, walls, and floors. Birds, vermin, rodents, and insects. Animals owned or kept by an insured. And constant or repeated seepage of water over a period of weeks, months, or years.
That last one deserves attention. A slow supply-line weep behind a vanity that runs for four months and rots the subfloor is excluded on a special form and it is excluded on a broad form. Open perils does not help you. The only thing that helps you is finding it, which is an inspection problem rather than a coverage problem.
Squirrels in the attic, the same. Excluded either way.
Your contents are probably still on named perils
Here is the part that catches experienced owners.
An HO-3 covers the dwelling on open perils and personal property on named perils. A DP-3 does the same. Moving up to a special form upgrades the building. It usually leaves the contents exactly where they were.
For an owner-occupied house that is a modest issue. For a furnished rental holding $40,000 in beds, sofas, televisions, and kitchen equipment, it is the majority of what guests actually damage. The building rarely gets hurt. The stuff inside it gets hurt constantly.
An HO-5 covers both on open perils. Commercial and dedicated short-term rental programs handle contents as business personal property, and the causes of loss form applies to both the building and the contents together.
If you take one action item out of this piece, make it this one. Find out which basis applies to your contents, separately from the building.
The commercial version of the same idea
Commercial property uses three causes of loss forms and the structure mirrors the dwelling family. Basic form, CP 10 10, is a short named-perils list. Broad form, CP 10 20, is a longer one. Special form, CP 10 30, is open perils.
The vocabulary changes. The logic does not. Special form means the carrier proves the exclusion.
How to check yours
Open the policy, not the declarations page. Find the section that begins the property coverage and read the first sentence under Perils Insured Against or Covered Causes of Loss.
If you see a numbered list of causes, you are on named perils. If you see the phrase risk of direct physical loss followed by exclusions, you are on open perils.
Do it twice. Once for the dwelling and once for personal property. They are frequently different, and the second answer is the one that matters most for a rental.
What to ask
Ask whether a special form is available on the dwelling and what it costs. The number is usually smaller than owners expect relative to what it changes.
Ask whether contents can be written on the same basis as the building, or whether the property has to move to a different policy structure to get there.
Ask which exclusions were bought back on your current policy. Water backup and sump overflow is the common one, and it is cheap. If nobody has bought it back, that is a five-minute fix.
If you want a second set of eyes on the answers, start with a free Risk Score. Thirty checks across six risk domains, about eight minutes, no email required to see your results.
This is the third article in a series on short-term rental insurance fundamentals. Threshold STR reads policies against how properties actually operate, and delivers a written, ranked summary of the gaps.