All results are approximations — your local building department (AHJ) has the final, binding determination. Always confirm before purchasing or permitting.
Estimate Only
Determination is based on county-dominant wind-speed data and an approximated 1-mile coastal buffer — not a parcel-specific tidal datum. Distance to mean high water, exposure category, and local amendments can shift the answer. Confirm with your local building department (AHJ) before purchasing or permitting. Prime Windows & Doors makes no warranty as to accuracy.
Click any county for requirements · Pinch or scroll to zoom
Verification Pathway
Per FBC 1609.2, the Wind-Borne Debris Region is defined as areas within 1 mile of the coastal mean high water line where Vult ≥ 130 mph, OR anywhere Vult ≥ 140 mph. The address-lookup result above is an estimate — the standard parcel-level determination process follows the steps below in order.
ATC Hazards by LocationPrimary Tool
The Applied Technology Council's free site-specific lookup using the exact ASCE 7-22 methodology adopted by the FBC. Returns Vult, Exposure Category, and Wind-Borne Debris status at any latitude/longitude. This is the answer for the majority of cases.
Open ATC Hazards
Local Building Department (AHJ)Final Authority
The Authority Having Jurisdiction issues the binding determination. The permit office can confirm Vult, Exposure Category, distance to mean high water, and WBDR status for your specific parcel, including any local amendments. They are the only entity that can rule definitively.
Find Permit Office
FEMA Flood Zone (NFHL)Heuristic Check
Coastal V-zones and most coastal A-zones overlap the WBDR. Useful as a sanity check before purchasing, but not the legal definition. Pull your parcel's flood zone designation alongside the AHJ's WBDR call.
FEMA Flood Map
Licensed Wind Mitigation InspectorInsurance Path
A Florida-licensed inspector documents Exposure Category and WBDR status on the Uniform Mitigation Verification form (OIR-B1-1802), which insurers require for windstorm credits. This is the path most homeowners take by default through their insurance carrier.
Florida-Licensed Structural EngineerComplex Sites
Required for Risk Category III/IV buildings and any parcel where Exposure Category, mean roof height, or topographic effects are not straightforward. The engineer's sealed wind-load calculation is the standard for permitting.
County cartographic boundaries — U.S. Census Bureau TIGER/Line 2023 (1:500,000)
Important Disclaimer · Read Before Use. This map is provided strictly as a general educational reference based on the 2023 Florida Building Code (8th Edition) and ASCE 7-22 as published. The optional 1-Mile MHWL Buffer overlay is a geometric approximation drawn 1 statute mile inland from the simplified U.S. Census coastline polygon; it is not the legally binding mean-high-water-line tidal datum used by the AHJ and may differ from the official boundary by hundreds of feet near rivers, inlets, marshes, and barrier islands. County designations are county-dominant values only. Actual code requirements depend on parcel-specific factors including exact distance to mean high water, exposure category (B, C, or D), mean roof height, building risk category, local amendments, and AHJ interpretation. Do not rely on this map alone for purchasing, permitting, or insurance decisions. Always confirm requirements with your local building department (AHJ) and the ATC Hazards by Location tool before specifying or installing windows and doors. Prime Windows & Doors makes no warranty, express or implied, regarding the accuracy or currency of this information and assumes no liability for decisions made in reliance on it.