HVHZ Construction: What Miami-Dade and Broward's Stricter Wind Codes Mean for Commercial Buildouts

Most of Florida builds to one wind standard. Miami-Dade and Broward counties build to another. The High Velocity Hurricane Zone (HVHZ), defined in Chapter 1620 of the Florida Building Code, was created in the aftermath of Hurricane Andrew, after the 1992 storm exposed just how badly standard construction and inconsistent product testing had failed the region. 

More than three decades later, HVHZ isn't a handful of extra rules layered onto the regular code. It's effectively a different code within the code, with its own product approval system, its own testing standards, and its own design wind speeds.

For a contractor used to bidding commercial work across the rest of Florida, that difference matters. Here's what actually changes when a project falls inside HVHZ.

Every Address in Miami-Dade and Broward Is HVHZ — No Exceptions

HVHZ isn't limited to coastal or flood-prone areas within these two counties. Every address in Miami-Dade County and every address in Broward County falls inside the zone, full stop. There's no inland exception and no partial-county carve-out. 

Worth noting: Palm Beach County, despite sharing similar coastal exposure, isn't included. That makes county lines, not proximity to the coast, the deciding factor for which code a commercial project has to meet.

Higher Design Wind Speeds Change the Engineering

Inside HVHZ, the minimum design wind speed for standard construction runs around 175 mph (3-second gust), compared to roughly 150–170 mph elsewhere in South Florida. That gap isn't just a number on a spec sheet, it changes the structural engineering behind a building's entire load path, from roof connections down through the wall system to the foundation. A structural engineer who hasn't designed to HVHZ wind loads before is starting from a different baseline than one who has.

Product Approval Works Differently Here

Florida has two tracks for approving building products used on the exterior envelope: a statewide Florida Product Approval, and a Miami-Dade Notice of Acceptance (NOA), which is a local approval specific to Miami-Dade County. Either one satisfies HVHZ, but only if the statewide Florida Product Approval specifically includes the HVHZ endorsement. A lot of products approved for general use across Florida were never tested to that standard, which means a roofing system, storefront glazing package, or door assembly that's perfectly compliant everywhere else in the state may not be usable in Miami-Dade or Broward at all.

The testing behind an HVHZ approval goes beyond standard impact testing:

• TAS 201 — large-missile impact testing, simulating debris strikes during a storm

• TAS 202 — cyclic wind-pressure testing, simulating thousands of pressure cycles from sustained gusting

• TAS 203 — static air-pressure testing under peak wind loads

This applies to roofing systems, curtain wall and storefront glazing, doors, and shutters — essentially anything on the building envelope exposed to wind and wind-borne debris. Before specifying or ordering any of it, the product's approval needs to be verified directly through Florida's Building Code Information System (BCIS) database, not assumed from a manufacturer's general marketing claim of "hurricane-rated."

What This Means for Budget and Schedule

HVHZ-approved products are a smaller, more specialized pool than the products available for a standard Florida commercial project, and that has real downstream effects:

• Lead times on HVHZ-approved roofing, glazing, and door assemblies commonly run longer than their standard-approval equivalents

• Material and labor costs for HVHZ-compliant construction are frequently cited in the range of 15–25% above non-HVHZ commercial projects of similar scope

• Installation methods are often part of the product approval itself, which means subcontractors need HVHZ-specific installation experience, not just general familiarity with the product line

None of this is a reason to avoid bidding work in Miami-Dade or Broward — it's a reason to price and schedule it correctly from the start, instead of discovering the gap mid-project.

What to Confirm Before You Bid or Break Ground

• Verify every exterior product on the spec carries a valid NOA or a Florida Product Approval with the HVHZ endorsement, confirmed on BCIS — not assumed from the product name

• Engage a structural engineer with direct HVHZ design experience, not just general Florida wind-load experience

• Build HVHZ product lead times into the project schedule as their own line item, separate from standard-approval materials

• Confirm roofing, glazing, and door subcontractors have hands-on HVHZ installation experience, since the approval often depends on the installation method

• Price the project against HVHZ cost realities from the estimate stage, not as a change order once it's underway

Building to HVHZ standards takes a different level of product knowledge and structural experience than the rest of Florida's commercial market. 

Maloney Construction manages commercial projects across Florida's wind zones, including Miami-Dade and Broward's HVHZ requirements, from product approval through final inspection. 

Contact our team to talk through your Miami-Dade or Broward commercial project.