The deductible on your commercial property policy may not be a single number. Many policies carry a flat deductible for most losses and a separate percentage deductible for wind and hail. The flat one is easy to see and easy to plan for. The percentage one sits quietly until a windstorm triggers it, and because it is figured on the whole building value rather than a fixed amount, it can dwarf the flat deductible you were expecting. Two policies can look nearly identical until that difference shows up at the claim.
How a flat deductible works
A flat deductible is a fixed dollar amount that applies to a covered loss. It is the number most owners look at on the declarations page, and it behaves the way people expect. The loss happens, the flat deductible comes off, and the policy pays the rest up to the limit. For everyday losses it is straightforward, which is part of why owners assume it is the only deductible on the policy.
How a percentage wind and hail deductible works
A percentage wind and hail deductible is a different structure. It applies only to wind or hail losses, and it is calculated as a percentage of the insured building value rather than the size of the loss. That is the part owners miss. Because it scales with the full building value on the policy, the resulting figure can be much larger than the flat deductible, and it comes off the top of the claim before the policy pays anything.
Why the gap can be so large
The reason the two diverge is the base they are figured on. A flat deductible is a fixed number. A percentage deductible is a share of the whole building value, so on a commercial building it can be a substantial figure. An owner who plans around the flat deductible can face a far bigger out-of-pocket number when a windstorm applies the percentage one instead. The larger your building value, the wider that gap tends to be, which is the opposite of what most owners assume.
Where the roof makes it worse
Wind and hail claims usually start with the roof, and the roof is already the part of a commercial policy most likely to carry extra conditions. A roof-age or cosmetic-damage limitation can reduce what the policy pays, and an aging roof may settle at actual cash value rather than replacement cost. Stack a percentage wind and hail deductible on top of that, and a storm claim can leave the owner covering most of the loss. These conditions tend to travel together.
Which structure fits
If your building sits in an area exposed to windstorms or hail, the deductible structure deserves as much attention as the premium. A flat wind and hail deductible, where available, gives you a known number, usually at a higher premium. A percentage deductible often lowers the premium but shifts a large, value-based cost onto you when a storm hits. The deciding factors are your wind and hail exposure, your building value, and how much of that storm risk you are willing to carry yourself.
Questions to ask your advisor
- Does my policy carry a separate wind and hail deductible, and is it a percentage?
- On my building value, what would that percentage deductible be in actual dollars?
- Which perils fall under the flat deductible and which under the percentage one?
- Is a flat wind and hail deductible available instead, and at what premium?
- How do my roof conditions interact with the wind and hail deductible?
A cheaper premium can hide a much larger deductible, and on wind and hail that trade is easy to miss because the flat number is the one on display. The percentage deductible only reveals itself when a storm applies it to your full building value. A coverage review identifies both deductibles, translates the percentage one into a real dollar figure on your building, and shows you the tradeoff, so a windstorm is not the first time you see the number.
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