Named storm deductibles: how percentage wind deductibles work

A named storm deductible is a percentage, usually 1% to 10%, of the insured value of your property, and it replaces the flat all-other-perils deductible when a storm that meets the policy's definition causes the loss. Because the percentage is applied to values you reported rather than to the damage, a $300,000 roof claim can fall entirely inside the deductible. What you actually keep turns on four things in the policy wording: what counts as a named storm, which values the percentage multiplies, whether it is calculated per location or across the schedule, and which perils it reaches.

Three deductibles that look alike

Commercial property policies in coastal and storm-exposed states often carry several wind-related deductibles, and the claim hits whichever one the wording selects.

ISO's CP 03 21, Windstorm or Hail Percentage Deductible, is the standard version of the second row. Commentary on the form describes a schedule of 1%, 2% or 5%, applied to the limit of insurance on the property that was damaged. The named storm version is usually a carrier or surplus lines manuscript endorsement, so wording differs from policy to policy. The related named storm deductible glossary entry has the short definition; the severe convective storms: hail, tornadoes and rising insured losses guide covers why wind and hail percentages have spread inland.

Question 1: what counts as a named storm

A name alone does not trigger the clause. The definition is contract language, and most tie it to an official classification, such as a storm declared by the National Weather Service or National Hurricane Center to be a hurricane, typhoon, tropical cyclone, tropical storm or tropical depression. Some forms add minimum wind speeds. Others start the clock when a watch or warning is issued and run it for a set number of hours after it ends. Read the clock language, because a storm can cause damage before or after the window.

Statutes show how specific this can get. For residential coverage, which Florida defines to include commercial policies for condominium and apartment associations, s. 627.4025 treats a storm as a hurricane only if the National Hurricane Center has declared it one, and it runs the hurricane window from the issuance of a hurricane warning for any part of Florida until 72 hours after the last hurricane watch or warning ends (Fla. Stat. 627.4025). A policy that says "hurricane" and one that says "named storm" therefore behave differently when a tropical storm never reaches hurricane strength. Non-residential commercial policies are set by their own wording, not by that section.

Hurricane Sandy shows how the end of the definition matters. The National Weather Service reclassified Sandy as post-tropical shortly before landfall. In Wakefern Food Corp. v. Lexington Insurance Co. (N.J. Super. Ct. Middlesex County, October 2014), a trial court applied a 2% named storm deductible at each affected location anyway, because the policy's wording and the timing of the losses tied the damage to the named storm (summary on the Property Insurance Coverage Law blog). That is one trial court on one policy, not a rule. It does show that arguing about whether the storm was still a storm is a bad place to be after the fact.

Question 2: what the percentage multiplies

The base is almost always the total insured value, not the loss. Policies word it as "x% of the Total Insurable Values at the time and place of the loss," and the values counted usually include building, contents and often the business income values too. That is why an accurate statement of values matters twice: it affects the premium and it sets the size of the deductible. Inflating values to be safe also inflates the deductible.

Add the minimums. Many forms carry a dollar floor per occurrence, for example the $250,000 minimum in the policy litigated in Saratoga Resources, Inc. v. Lexington Insurance Co. (5th Cir. 2016), where the deductible for named windstorm, flood and earth movement was 5% of Total Insurable Values.

Question 3: per location or across the schedule

The same percentage produces very different results depending on how the policy applies it. In Saratoga, Hurricane Isaac damaged several insured properties. The Fifth Circuit held, applying Texas law, that "5% of Total Insurable Values" meant 5% of the aggregate insured value of the damaged properties, a deductible of $912,500, rather than separate smaller deductibles for each property as the insured argued (opinion, unpublished). The court gave the words their ordinary meaning and declined to read in a qualifier such as "per interest" that the drafters had not written.

A hypothetical example

Say a distribution company in coastal Texas has three warehouses valued at $12 million, $8 million and $5 million. A named storm damages the first by $900,000 and the second by $300,000. The policy carries a 5% named storm deductible.

The numbers are invented, but the spread is the point. A per-location clause with the words "each location involved in the loss" is more favorable than an aggregate clause, and the difference is negotiable at placement, not at claim time. The deductible and retention break-even calculator helps test what your balance sheet can carry.

Question 4: does it reach flood and storm surge

Wind is rarely the only thing a hurricane does. Whether the deductible also attaches to storm-driven water depends on the definition. In Pan Am Equities, Inc. v. Lexington Insurance Co., 959 F.3d 671 (5th Cir. 2020), a Hurricane Harvey dispute, the court applied the windstorm deductible to flood damage because the policy's named storm provision expressly pulled associated perils such as flood into it. If the policy covers flood at all, check for a separate flood deductible or sublimit, and check which one controls when two apply. Many clauses say the largest deductible governs. The Commercial flood insurance: NFIP limits and private options guide explains NFIP limits and private flood.

Deductible buy-back policies

A buy-back policy reimburses all or part of a large deductible. The wording of the buy-back has to match the wording of the underlying deductible, and this is where claims fail. In Landmark American Insurance Co. v. SCD Memorial Place II, L.L.C. (5th Cir. Feb. 3, 2022), the buy-back covered only "Windstorm or Hail associated with a Named Storm." The building was flooded by Hurricane Harvey with no wind damage, the primary policy paid above its windstorm deductible, and the court held the buy-back, a named-perils policy, did not respond to flood. The insured kept the whole deductible.

Before buying one, confirm that the perils, the named storm definition, the per-occurrence and annual aggregate limits and the deductible calculation all line up with the primary form.

Residual markets and the 2026 market

State-backed insurers set their own menus. Citizens, Florida's residual insurer, lists hurricane deductibles of 1%, 2%, 3%, 5% and 10% for commercial residential wind-only coverage on its January 2026 coverage worksheet, applied to the calendar year of occurrence. Its non-hurricane wind deductible for commercial policies can also be a percentage (Citizens deductibles page). See FAIR Plans and residual markets for commercial property for how residual markets work.

In the private market, capacity has eased. In its 2026 Property State of the Market report, as reported by Artemis in April 2026, wholesale broker CRC Group said catastrophe wind is one of the most aggressively softening excess and surplus property segments, with rate decreases of 20% to 30% increasingly common and capacity at historic highs in the Southeast and Gulf Coast. CRC added that carriers can be selective and that catastrophe wind deductibles have been more volatile than earthquake deductibles. When pricing softens, ask whether a lower deductible or a per-location basis can be bought instead of a smaller premium. Context for Florida is in florida's commercial property insurance market, and hurricane season and commercial property insurance: what to do before a storm covers the season.

Timing: binding restrictions

Carriers commonly suspend new business and limit increases when a named storm is forecast to threaten an area, often with a geographic box and a lift only on written notice. Practice varies by carrier and program, and renewals are usually spared. The practical rule is to change limits, add locations or buy a buy-back before a storm is in the Gulf, not after.

Checklist before renewal

• Get the named storm definition and read the start and end language.
• Identify the base: building only, or building, contents and income.
• Confirm "each location," "each building" or "aggregate."
• Find the dollar minimum per occurrence and any annual aggregate.
• Check whether flood and storm surge fall under the same deductible.
• Ask for the tier or distance-to-coast map the carrier uses.
• Model the deductible in dollars for your three largest locations.

Key takeaways

• A named storm deductible is a percentage of insured value, not of the loss, and it can swallow a claim entirely.
• The definition of a named storm, the values counted and per-location versus aggregate wording are all negotiable before the storm and fixed after it.
• Courts enforce the ordinary meaning of the clause, as in the Fifth Circuit's Saratoga decision, so wording that says "each" matters.
• Deductible buy-back policies pay only for the perils they name; a wind-only buy-back may not respond to a flood deductible.
• Soft cat wind pricing in 2026 is an opening to buy better deductible terms, not only cheaper premium.