What the HVHZ is
The HVHZ covers Miami-Dade and Broward counties. In this zone the Florida Building Code requires the toughest construction standards in the state: roofing, windows, doors, and other building products must carry a Miami-Dade Notice of Acceptance (NOA) or an equivalent Florida Product Approval, must be impact-rated, and roofs must meet stricter attachment and secondary-water-barrier requirements. These rules exist because South Florida takes the most direct, highest-wind hurricane strikes.
Why the HVHZ matters to your claim
When a covered loss forces repairs in the HVHZ, code-compliant materials and installation usually cost more than a like-for-like patch. If your home was built or last re-roofed under older standards, bringing the repair up to current HVHZ code can add substantial cost, and that gap is what code upgrade (law and ordinance) coverage is meant to pay. Carriers frequently scope HVHZ roof and opening repairs using non-HVHZ pricing or products that are not NOA-approved, which understates the loss. Insist that the estimate specify approved products and HVHZ installation methods.