Florida’s wind code isn’t really organized by county, even though it’s tempting to think of it that way. It’s organized by wind speed contour lines drawn from decades of hurricane data, and county boundaries just happen to intersect those lines in different places. That distinction matters more than it sounds like it would.
Short version: Florida’s wind code has three tiers: the High-Velocity Hurricane Zone (HVHZ), legally confined to Miami-Dade and Broward counties, with design speeds of 170 to 175 mph; the Wind-Borne Debris Region (WBDR), triggered wherever design wind speed hits 140 mph or 130 mph within a mile of the coast, requiring impact-rated windows and doors; and everywhere else, under standard requirements. Central Florida, including Orange, Osceola, Seminole, Lake, and Polk counties, generally runs 130 to 140 mph, below the WBDR threshold for most of the region, with one real exception: areas near several of Orange County’s larger lakes.
The three tiers, and why they don’t map cleanly to counties
The High-Velocity Hurricane Zone is the one genuinely county-based rule in this system: it’s legally defined as Miami-Dade and Broward, full stop, with its own separate, stricter code requiring Miami-Dade Notice of Acceptance product approval and specific impact testing protocols, the toughest standard in the country. Everywhere else, the Wind-Borne Debris Region is determined by the actual mapped design wind speed at a given site, 140 mph or higher anywhere, or 130 mph or higher within one mile of the coast, not by which county you’re in. That’s why two homes in the same county, one a mile inland and one on the coast, can face genuinely different requirements.
Regional wind speed comparison
| Region | Typical design wind speed (Risk Category II) | Tier |
|---|---|---|
| Miami-Dade County | 175 mph | HVHZ |
| Broward County | 170 mph | HVHZ |
| Southwest FL coast (e.g. Lee County) | ~170-180 mph | WBDR (coastal) |
| Palm Beach County | 150-170 mph | WBDR (coastal areas) |
| Tampa Bay area (Hillsborough, Pinellas) | 140-160 mph | WBDR (coastal areas) |
| Florida Panhandle | 140-160 mph | WBDR (coastal areas) |
| Central Florida (Orange, Osceola, Seminole, Lake, Polk) | 130-140 mph | Mostly standard, WBDR only near specific inland lakes |
These are typical ranges, not a substitute for checking your specific address, which the last section of this article covers directly.
The Orange County lake exception worth actually knowing about
When the current code edition adopted its updated wind-speed mapping standard, the Wind-Borne Debris Region briefly expanded to include areas around several of Orange County’s larger lakes, Lake Apopka, the Butler Chain, and Lake Conway among them, catching some homeowners off guard who assumed being 50-plus miles from the ocean meant WBDR rules simply didn’t apply to them. If your property sits near one of these lakes, don’t assume standard rules apply just because you’re nowhere near the coast, check your specific address rather than going by general Central Florida expectations.
The replacement window rule that surprises existing homeowners
If your home is already inside a mapped Wind-Borne Debris Region, built before that requirement applied to it, there’s a specific trigger worth knowing: replacing more than 25% of the home’s total glazed area (windows and glass doors combined) within a 12-month period requires bringing that glazing up to current impact-rated standards, even though the rest of the house remains grandfathered. This has real budget implications if you’re planning a phased window replacement project, doing it in stages to spread out cost can unintentionally cross that 25% threshold and trigger a much bigger scope than planned.
What’s changing at the end of this year
Florida’s 9th Edition Building Code is expected to take effect December 31, 2026. One of its most consequential changes: the 160 mph design wind-speed zone, currently confined to the HVHZ under the 8th Edition, expands to cover all new construction within five miles of tidal water, statewide. That’s a meaningful jump for coastal communities that have been designing to 130 or 140 mph, and it’s worth knowing about now if you’re planning a coastal project timed around this transition, permits pulled before the effective date generally lock into the current, less stringent 8th Edition rules.
How to check your actual address
Regional ranges are useful for planning, but the wind speed that actually governs your project comes from your specific site. The ASCE 7 Hazard Tool and the University of Florida GeoPlan Center’s wind speed map viewer both let you enter a street address and return the current design wind speed and WBDR status directly, the same sources engineers and building departments use, and the only way to know for certain whether your specific property, lake-adjacent or not, falls inside a stricter zone than the general area around it suggests.
Frequently Asked Questions
Only Miami-Dade and Broward counties. It’s a legally defined, county-based boundary, unlike the rest of Florida’s wind code, which follows wind speed contours rather than county lines.
Generally no, most of Orange, Osceola, Seminole, Lake, and Polk counties fall below the Wind-Borne Debris Region threshold. Exceptions exist near several of Orange County’s larger lakes, worth checking your specific address rather than assuming.
A mapped design wind speed of 140 mph or higher anywhere in the state, or 130 mph or higher within one mile of the coast. It’s determined by location, not county.
If your home is in a mapped Wind-Borne Debris Region, replacing more than 25% of the home’s total glazed area within 12 months triggers impact-rated requirements for that replaced glazing, even if the rest of the home remains grandfathered.
Use the ASCE 7 Hazard Tool or the University of Florida GeoPlan Center’s wind speed map viewer, both let you enter a specific address and return the current design wind speed and WBDR status.
Sources:
https://www.meltplan.com/blogs/florida-wind-load-design-a-guide-to-fbc-hurricane-protection-requirements
https://ajwindowhaus.com/florida-hurricane-window-code-by-county/
https://safeguardimpact.com/florida-building-code-impact-window-requirements-2026/
https://www.geoplan.ufl.edu/portfolio/wind-speed/