What Is HVHZ (High-Velocity Hurricane Zone)?

HVHZ (High-Velocity Hurricane Zone): A designation under the Florida Building Code identifying Miami-Dade and Broward Counties as areas requiring the highest level of wind-resistance for building materials and construction methods, due to their exposure to high-velocity hurricane winds.

Why HVHZ Exists

South Florida experiences some of the highest design wind speeds in the continental U.S. Hurricane Andrew in 1992 exposed catastrophic failures in building materials and construction practices that didn't meet adequate wind standards. In response, Miami-Dade County developed the HVHZ designation and an aggressive building product approval program to ensure all materials used in construction can withstand major hurricane wind loads.

Miami-Dade Product Approval

The cornerstone of HVHZ regulation is the Miami-Dade Product Approval system. Every building product used in HVHZ — windows, doors, roofing materials, garage doors, fasteners, siding, and more — must have either Miami-Dade County approval (the most stringent) or Florida Product Approval. These approvals require laboratory testing to verify performance at extreme wind pressures. Contractors cannot substitute materials without verified approvals.

How HVHZ Affects Building Permits

Building permits in HVHZ require documentation that all proposed materials carry valid Miami-Dade or Florida Product Approvals. Plans must specify approved product numbers, installation specifications, and wind load calculations. Even routine projects — a roof replacement, new windows, a garage door — require approved products and often require engineering documents in HVHZ that would be simpler in non-HVHZ areas.

HVHZ and Insurance

HVHZ requirements and Florida wind mitigation inspections are closely linked to property insurance in South Florida. Buildings that meet current HVHZ standards may qualify for wind mitigation discounts on homeowner's insurance — a significant benefit given the extremely high insurance costs in South Florida. Non-compliant construction can result in insurance non-renewal.

Frequently Asked Questions

No — HVHZ applies specifically to Miami-Dade and Broward counties. The rest of Florida follows the Florida Building Code's High-Wind requirements, which are still more stringent than most U.S. states but less restrictive than HVHZ. Some other coastal counties may have additional wind requirements.

No. All roofing materials in HVHZ must carry valid Miami-Dade or Florida Product Approval for the specific application. This includes shingles, tiles, underlayment, fasteners, and adhesives. Your roofing contractor must be able to produce product approval numbers for every material used.

HVHZ is a zone designation within the Florida Building Code that triggers additional requirements. The Florida Building Code applies statewide, but the HVHZ provisions add requirements specifically for Miami-Dade and Broward counties on top of the statewide code.