Remodeling in the HVHZ: What Miami-Dade and Broward Require.

What the HVHZ Actually Is

The High-Velocity Hurricane Zone (HVHZ) is a special wind-design region inside the Florida Building Code (FBC) reserved for the area at greatest risk of extreme hurricane wind. It is not a guideline. It is a set of binding code provisions that raise the design wind speed and demand independently tested, approved products for the entire building envelope.

The HVHZ exists because the catastrophic envelope failures documented after Hurricane Andrew (1992) traced back to windows, doors, and roof coverings that could not survive wind-borne debris. The state’s answer was the toughest opening-protection regime in the United States, codified for the two counties that took the worst of that storm and remain the most exposed.

How the HVHZ differs from the rest of Florida

Outside the HVHZ, much of coastal Florida still sits in a Wind-Borne Debris Region and requires impact-rated or shuttered glazing. The HVHZ goes further: it is the only region that requires impact resistance for the whole envelope and that channels product acceptance through Miami-Dade’s own testing and listing system.

The provisions live in the Florida Building Code, 8th Edition (2023), and are administered locally — Miami-Dade through its Product Control Section, Broward through its Board of Rules and Appeals. Both honor the same testing standards, so a product cleared for one is cleared for the other. For a homeowner, that consistency is the silver lining: vetting a window once answers the question for the entire zone.

Why it matters for a remodel, not just new construction

It is a common assumption that HVHZ rules only bite on new homes. They do not. The moment a remodel replaces or adds an exterior opening, the new component must meet current HVHZ product standards — even if the rest of the house predates them. Renovation is precisely where most homeowners first encounter the NOA requirement, because they are swapping decades-old windows for impact units.

Which Counties Qualify as HVHZ

The HVHZ is exactly two counties: Miami-Dade and Broward. That is the entire zone. A remodel one county north in Palm Beach, or south in Monroe (the Florida Keys), is governed by standard FBC wind provisions, not the HVHZ chapter.

The common misconceptions

Two errors recur. First, people assume "South Florida" equals the HVHZ — it does not; the line stops at the Broward–Palm Beach border. Second, people assume the Keys are in it because they look the most hurricane-exposed; Monroe County is explicitly outside the HVHZ and writes its own high-wind amendments.

Inside the HVHZ

Miami-Dade County and Broward County only. Both design to the HVHZ provisions and accept Miami-Dade NOAs and HVHZ-endorsed Florida Product Approvals.

Outside the HVHZ

Palm Beach, Monroe, and every other Florida county. Many are still Wind-Borne Debris Regions requiring impact glazing, but they use the statewide product-approval path without the HVHZ envelope rule.

For a homeowner, the practical takeaway is binary: confirm the jurisdiction first, because it decides which approval document every window, door, and skylight on the job must carry.

The Design Wind Speeds You Build To

In the HVHZ, structures are engineered to a 3-second-gust design wind speed that varies by county and by Risk Category. For a typical single-family home — Risk Category II — the design speed is 175 mph in Miami-Dade and 170 mph in Broward under the FBC, 8th Edition (2023).

What Risk Category means

Risk Category is a hazard-to-life classification. Category II covers ordinary homes; Categories III and IV cover assembly, schools, and essential facilities and design to higher speeds. The category sets the design pressure your openings and their anchors must resist — which is why a product’s approval lists a tested pressure range.

These are 3-second-gust speeds, the basis the FBC adopted from ASCE 7. The number itself rarely appears on a homeowner’s permit, but it is baked into the design pressure that every approved opening must meet for your address.

How wind speed becomes design pressure

The county wind speed feeds an engineering calculation that converts it into a positive and negative design pressure (measured in pounds per square foot) for each opening, sized to its location on the wall and the building height. A product’s approval lists the pressure range it was tested to, and that range must envelope the design pressure for your wall — the link between the headline mph figure and the document on your permit.

NOA vs Florida Product Approval

Two documents can legally clear an exterior product for HVHZ use, and a remodel permit will demand one of them for each opening. They are different routes to the same proof: that the product survived HVHZ-level testing.

Miami-Dade Notice of Acceptance (NOA)

A Notice of Acceptance (NOA) is issued by the Miami-Dade County Product Control Section. It certifies that a specific product passed the required tests and lists the conditions of use — including the installation drawings the product must be installed by. An NOA is valid throughout the HVHZ and is widely accepted statewide.

Florida Product Approval with HVHZ endorsement

The statewide Florida Product Approval system (a state-issued FL number under Rule 61G20-3, Florida Administrative Code) can also carry an "approved for HVHZ" limitation of use. When it does, the product is valid in Miami-Dade, Broward, and the rest of the state.

The distinction that trips up homeowners is that a plain Florida Product Approval is not automatically HVHZ-rated. A statewide FL# without the HVHZ limitation is fine in Tampa or Orlando but invalid in the zone. Inside Miami-Dade and Broward you must confirm the listing explicitly states HVHZ acceptance — the same product line often sells in two versions, only one of which clears here. Verify the approval number against the Miami-Dade or state database before it ships, not after it arrives on the truck.

We unpack the choice between the two paths, and when an FL# is the cleaner option, in our breakdown of NOA versus Florida Product Approval. For the permit itself, the rule is simple: one valid approval document per opening, on site, before inspection.

Inside TAS 201, 202, and 203

An HVHZ approval is only as good as the tests behind it. Miami-Dade’s Testing Application Standards (TAS) 201, 202, and 203 are the protocols an opening product must pass before it earns an NOA or an HVHZ-endorsed FL#. Together they simulate a hurricane’s debris and pressure cycling.

The sequence matters: a window is hit (TAS 201), then cycled under pressure (TAS 203) to confirm the impacted unit still holds the building envelope closed. A product that passes all three is what "Miami-Dade rated" actually means.

Why the whole-envelope rule follows from this

Because the HVHZ requires impact protection for the entire envelope — windows, doors, garage doors, skylights, and roof coverings — a remodel that opens up any of these elements pulls the new product into the TAS regime. You cannot mix a tested window with an untested adjacent door and remain compliant.

The Permit Flow for an HVHZ Remodel

An HVHZ remodel permit runs the same arc as any FBC permit, with two added pressure points: product documentation at plan review, and installation verification at inspection. Missing either stalls the job.

The thread running through all five steps is documentation discipline: the right approval, attached to the right drawing, installed the way the drawing specifies. Our permit handling team assembles the NOA package and carries it through plan review and inspection so the schedule does not slip on a paperwork comment.

What a Remodel Triggers in the Zone

Not every remodel detonates the full HVHZ product regime — but the trigger line is sharper here than anywhere else in Florida. The deciding question is whether you are touching the building envelope or staying inside it.

Scopes that pull in HVHZ product rules

• New or enlarged openings: cutting a wall for a new window or a sliding door brings in NOA-rated glazing and an engineered opening.
• Window and door replacement: swapping units almost always requires HVHZ-approved replacements installed to the drawing.
• Garage doors and skylights: both are envelope elements and both need approved, impact-rated assemblies.
• Removing a load-bearing exterior wall: structural and envelope changes layer engineering on top of product approval, as covered in our sunroom glazing guide.

These scopes share one trait: they alter how the home resists wind, so the code insists the new components are proven to HVHZ standards.

Scopes that usually stay interior

• Like-for-like flooring: replacing a floor inside the conditioned envelope does not, by itself, invoke HVHZ product rules.
• Cabinet and countertop swaps: interior finish work with no envelope change.
• Cosmetic refinishing: paint, trim, and surface updates that leave openings untouched.

The catch is that many remodels blur the line — a kitchen project that adds a new window, or a bathroom that vents through an exterior wall, crosses into envelope territory. When that happens, the safest path is to treat the opening as a full HVHZ product item from day one. A licensed general contractor working in Miami-Dade and Broward should scope the envelope question before demolition, and our home renovation teams map it during the estimate so there are no mid-project surprises.