Before you buy hurricane shutters, you need to know your wind zone. It determines which products are legally code-compliant for your address, what your insurance company requires, and ultimately how much you'll spend. Here's everything you need to know.
What Is a Hurricane Wind Zone?
A wind zone is a geographic designation that specifies the minimum design wind speed — in miles per hour — that structures and storm protection products must be engineered to withstand in a given area.
The International Building Code (IBC) and each state's building code divide coastal areas into wind speed zones based on historical storm data, geographic exposure, and risk modeling. The higher your zone's wind speed requirement, the stronger — and generally more expensive — your storm protection needs to be.
Wind zones are determined at the county level in most states, and sometimes at the city or township level. Two homes five miles apart can be in different wind zones with different product requirements.
The Main Wind Zone Categories
| Zone | Design Wind Speed | Typical Location | Product Requirement |
|---|---|---|---|
| Basic | 90–110 mph | Inland areas, low exposure | Standard rated products |
| Exposure B | 110–130 mph | Suburban coastal areas | Mid-range impact ratings |
| Exposure C | 130–150 mph | Open coastal terrain | Higher impact ratings |
| Exposure D | 150–170 mph | Waterfront, open water exposure | High-impact rated products |
| HVHZ | 170+ mph | Miami-Dade & Broward FL only | NOA required — strictest in US |
The High-Velocity Hurricane Zone (HVHZ) covering Miami-Dade and Broward counties in Florida is the most demanding wind zone in the United States. Products installed there must carry a Miami-Dade Notice of Acceptance (NOA) — a separate, more rigorous certification than the standard Florida Product Approval used in the rest of the state.
How to Find Your Wind Zone
There are three reliable ways to find your exact wind zone:
- County building department website — search "[your county] wind zone map" or "[your county] building code wind speed." Most counties publish their wind zone maps online.
- Our cost calculator — our free calculator automatically loads your county's wind zone when you select your state and county. This is the fastest method.
- Florida residents — use the Florida Building Code's online wind speed lookup at floridabuilding.org. Enter your address and it returns your exact design wind speed.
What Is a Florida Product Approval?
In Florida, every storm protection product installed on a building must carry a Florida Product Approval number (FL number). This is issued by the Florida Building Commission after independent testing proves the product meets the state's wind resistance and impact standards.
Every approved product has an FL number formatted like FL12345. You can look up any product at floridabuilding.org by entering the FL number.
The product approval specifies:
- The maximum design wind speed the product is rated for
- Whether it meets large-missile or small-missile impact standards
- The specific sizes and configurations that are approved
- Installation requirements — fastener size, spacing, substrate
If your contractor installs a product in a size or configuration not listed in the product approval, the installation is not code-compliant even if the product itself is approved.
Miami-Dade NOA — The Strictest Standard
If you live in Miami-Dade or Broward County, standard Florida Product Approval is not enough. You need products with a Miami-Dade Notice of Acceptance (NOA).
NOA testing is significantly more rigorous than standard FL approval — it includes large-missile impact testing, cyclic wind pressure testing, and water infiltration testing that other counties don't require.
Products with NOA approval cost 10–20% more than comparable non-HVHZ products and are required by law for any permitted shutter installation in Miami-Dade or Broward. Do not let a contractor install non-NOA products in the HVHZ — they will not pass inspection and may need to be removed at your expense.
Look up any product's NOA at miamidade.gov.
Wind Zone Requirements in Other Coastal States
Every coastal state has its own building code wind speed requirements. Here's a quick overview:
| State | Code Standard | Coastal Wind Speed | Where to Verify |
|---|---|---|---|
| Florida | Florida Building Code | 110–180+ mph | floridabuilding.org |
| Texas | Texas Windstorm (TWIA zones) | 110–150 mph coastal | twia.org |
| Louisiana | Louisiana State Plumbing & Building Code | 100–150 mph | Parish building dept |
| South Carolina | South Carolina Building Code | 110–150 mph coast | County building dept |
| North Carolina | NC State Building Code | 110–160 mph Outer Banks | ncdoi.gov |
| New Jersey | NJ Uniform Construction Code | 110–140 mph shore | nj.gov/dca |
| New York | NYC Building Code / NYS Building Code | 110–140 mph Long Island | nyc.gov/buildings |
In Texas, the TWIA (Texas Windstorm Insurance Association) zone map is particularly important — properties in TWIA zones require windstorm certification on all hurricane protection for insurance purposes.
Frequently Asked Questions
Does my wind zone change if I'm a mile inland from the beach?
Yes, potentially. Wind zones are based on exposure category which accounts for distance from open water, terrain roughness, and obstructions. A home one block from the beach may be in a higher exposure category than one a mile inland in the same county. Your county building department can tell you your specific exposure category based on your address.
What happens if I install shutters that don't meet my wind zone?
The installation will fail the building inspection. If installed without a permit, the shutters may need to be removed and replaced when discovered — which typically happens at home sale. Your insurance company may also deny wind mitigation credits for non-compliant protection.
My contractor said I don't need an NOA — I'm in Miami-Dade. Is that right?
No. Any contractor telling you that NOA approval is not required for a permitted installation in Miami-Dade or Broward is either misinformed or trying to sell you a cheaper non-compliant product. All permitted shutter and impact window installations in the HVHZ require products with valid NOA approval.