Percentage Wind and Hail Deductibles, and What They Attach To

A percentage wind or hail deductible is not a larger deductible. It is a retention that is calculated rather than chosen, and the calculation takes two inputs: a percentage, which is printed, and a base, which often is not. On a renovation the base is the input nobody is holding still.

What the number is multiplied by, and what it is not

Maryland’s Insurance Administration puts the whole mechanic in one sentence. A percentage deductible, it says, “is based on your Coverage A – Dwelling policy limit and not on the amount of your damage claim”.

Read that twice, because the second half is the part that surprises people. The size of the loss does not enter the arithmetic. Neither does the repair estimate, the cost of the covering, the age of the roof or the severity of the storm. The percentage is a multiplier, the building limit is the multiplicand, and the retention is the product. A total loss and a partial loss on the same building carry the same retention.

Three other departments describe the same base from three directions. Connecticut’s Insurance Department, on the storm-claims page behind its own guidance for owners, says a windstorm or hail deductible “may either be in the form of a flat dollar amount or a percentage of the limit for Coverage A Dwelling”. Maine’s Bureau of Insurance says special deductibles for perils such as windstorm “may be expressed as a percentage of your coverage limit”. Rhode Island’s Department of Business Regulation, in the claims guide that sits behind what the state tells owners after a disaster, reduces it further: a deductible “can be either a specific dollar amount or a percentage of the total amount of insurance”.

Four regulators, one base. Then there is New York, and the exception it names is worth more than the agreement.

Where one department names two bases instead of one

New York’s Department of Financial Services describes the optional windstorm retention and the mandated hurricane one as percentages “of either the value of the dwelling or the amount of insurance on the dwelling”. Two candidates, in one sentence, from one regulator.

On a finished building those two figures are usually close enough that nobody argues. On a rehab they are not the same number and they are not even the same kind of number. The amount of insurance is what the file argued for and what the schedule of work supports. The value is what somebody else concludes about a building that is, at the moment of the storm, part demolished and part rebuilt. If the wording on your quote does not say which one it means, that is a question with a real answer and it is worth extracting before binding rather than after a loss. The same department is the one that, per the New York entry, notes that some insurers require a hurricane retention for property in the five boroughs, Nassau and Suffolk counties and coastal Westchester — so this is not an academic distinction in the places where the retention is least optional.

Same damage, two different settlements

The Rhode Island guide does something most consumer material does not: it sets a flat-dollar column beside a percentage column, on identical damage to the same building, and runs the arithmetic down both. The damage line is the same in each column. The settlement line is not.

That is the honest way to hold the choice. A flat retention is a fixed exposure that does not care how large the building is. A percentage retention is a proportional one that scales with the limit and therefore scales with the ambition of the project. Which of the two is cheaper on any given file is not a general fact about deductibles at all — it is entirely a question of what the base is. The same guide notes that a special retention attached to one part of the building, a roof for instance, can likewise be written either as a flat amount or as a percentage, which means the flat-or-proportional question can appear twice on one policy.

The cause of loss selects the retention, and the form says the highest one wins

Two retentions on one declarations page reads, to most people, like two bills. It is not.

Rhode Island describes the selection plainly from the consumer side: where a policy carries a special retention for the storm causes, the insurer reaches for that one when a storm did the damage, and where anything else did, the “all peril” deductible answers instead. Connecticut states the same relationship from the regulatory side, permitting an insurer to impose a windstorm or hail deductible “in lieu of an overall policy deductible” rather than on top of one.

The published form settles it in its own conditions. The residential special form that Maine’s Bureau of Insurance makes available in full — HO 00 03 05 11 — carries a Deductible condition in Section I that says, of any one loss, that the insurer pays only that part of the loss “that exceeds the deductible amount shown in the Declarations”, and then adds the sentence that ends the argument: if two or more deductibles under the policy apply to the loss, only the highest deductible amount will apply. The condition opens with its own hedge, “Unless otherwise noted in this policy,” which is precisely why an endorsement carrying a storm retention has to be read beside it rather than instead of it.

Notice the other thing that condition does. It pays over an amount shown in the Declarations. A percentage is not an amount until somebody multiplies it, which is the small operational gap this whole subject lives in. New York closes that gap by rule — it requires insurers to express the hurricane retention as a dollar amount on the declarations page of any policy to which it attaches. Where no such rule applies, the multiplication is yours to do.

What throws the switch is measured somewhere other than the site

For the named-storm and hurricane classes, which retention answers a given loss is not decided by looking at the building.

Connecticut’s department allows a hurricane deductible to be applied only where a National Hurricane Center warning is in effect for part of the state and the storm reaches hurricane-strength sustained winds, and only within a window that opens no earlier than that warning and closes a set period after the last warning is terminated or the storm is downgraded. That is a meteorological determination, made elsewhere, sometimes before the wind reaches the address and sometimes after the crew has gone home for the weekend.

For a rehab the consequence is procedural rather than dramatic. The difference between the ordinary retention and the storm one can be decided by a bulletin nobody on the job saw, and the record of what was in effect and when is public and permanent. That is one of the few inputs on a renovation file that nobody on the job can influence at all — which makes it one worth knowing the shape of in advance.

Every revision to the limit is a revision to the retention

Here is where this stops being a coastal curiosity and becomes a rehab problem.

The base is the building limit. On a renovation, the building limit is argued toward the building at the end of the schedule rather than the one at acquisition, and the argument that gets it there is the subject of the piece on which contract a rehab belongs on. What follows from it here is arithmetic and it is unforgiving: raise the multiplicand, and the product rises with it.

Nothing announces this. No endorsement is issued, no notice arrives, no signature is collected, and the percentage on the declarations page is character-for-character identical before and after. The single most common version of the surprise is an owner who did the responsible thing — revised the limit upward when the scope grew, because a limit set to the acquisition figure would have been the more famous mistake — and discovered only at a claim that the same edit had moved the storm retention with it. Both effects come from one number, pulling in opposite directions: upward on what the policy will pay, and upward on what you fund first.

The light-rehab side is where this bites hardest, because that is where the Coverage A limit and the percentage sit on the same contract. What an endorsed dwelling form restores and what it leaves out is its own question; what the storm retention is a share of is this one, and the two get read at the same moment or neither does.

Real-World Scenario: The percentage never changes, which is exactly why nobody re-reads it. A coastal rehab is bound in the spring with the building limit set where the written scope of work put it, and a named-storm retention on the declarations page expressed as a share of that limit. In week five the scope grows — the rear elevation opens, the framing plan is redrawn, and the limit is revised upward to match, correctly, on the advice of everyone involved. Nothing about the storm line is discussed, because nothing about the storm line changed. It still reads as the same percentage it read on day one. What moved is the number underneath it, and the first time anyone works out the product is on the far side of a storm, with a roof open and a crew that cannot start until the retention is funded.

When wind and hail move to a second policy, the arithmetic moves with them

In some coastal markets the peril does not stay on the property form at all.

Along the South Carolina coast, wind and hail may be stripped out of the primary policy and written separately through the South Carolina Wind and Hail Underwriting Association, as the South Carolina page records. North Carolina’s department describes the same pattern in its own terms: depending on location and underwriting, windstorm and hail coverage may be excluded from the primary residential property policy and bought back as a separate policy carrying its own separate deductible, which is what the North Carolina page sets out.

Read that through the mechanic and the consequence is immediate. Two policies means two limits, and a percentage on the wind policy is a percentage of that policy’s limit. There is no rule of nature making the two limits equal, and on a renovation there is an active reason for them to diverge, since the two placements may have been written at different points in a schedule that kept moving. Anyone reasoning about the storm exposure from the property declarations page alone is reading half the file.

The construction side has its own version of this. A builders risk placement is a different instrument with its own retention structure, and the rule that the percentage attaches to whatever limit its own contract carries travels there unchanged.

Three lines to find before you look at the premium line

This takes about ten minutes with the paperwork already in the file.

Find the Coverage A limit first, because it is the base and everything else is derived from it. Then find the deductible block and count the lines in it: one line means one retention for everything, two or more means a special retention exists and the causes it names are printed right there — wind and hail, named storm, hurricane, or a specific part of the building such as the roof. Then read how the special line is written. If it is an amount, you are done. If it is a percentage, multiply it by the Coverage A limit yourself and write the product somewhere you will see it again.

The terms worth looking for by name are the ones the departments themselves use: Coverage A – Dwelling, the all-peril deductible, and whichever of windstorm, wind and hail, named storm or hurricane labels the special line. A separate wind policy, where one exists, gets the same three steps run against its own declarations page.

Then two questions for the agent, both of which have short answers. What happens to the product when the limit is revised mid-project? And if the file carries a separate wind placement, which limit does its percentage run off? Those questions belong in the same conversation as the scope of work, whether the job is a structural one or a finish-work one, and they are a different question from what the cover costs, which the drivers answer separately. The conditions this retention sits among — what the form assumes about an empty building, and what it says about a building under construction — are set out in the companion piece on the dwelling form itself. When the declarations page and the scope are in front of you together, send us both.