Florida Hurricane Window Code Requirements: A Plain-English Guide for 2026
The Florida Building Code (FBC) — currently in its 8th Edition, 2023 — defines where hurricane impact windows are mandatory, what design pressures they must meet, and what testing and certification is required. This guide breaks down the rules in plain English for homeowners and contractors working in Miami-Dade, Broward, and Palm Beach counties.
In Miami-Dade and Broward (the HVHZ), every exterior opening needs Miami-Dade NOA approved impact protection — windows or shutters. Outside the HVHZ in coastal wind zones, opening protection is still required for new construction. Every replacement requires a permit and a final inspection. Design pressure (DP) ratings must be calculated per ASCE 7 for each opening.
The Florida Building Code framework
Florida adopted a unified statewide building code in 2002 in the wake of Hurricane Andrew (1992). The current edition is the Florida Building Code, 8th Edition (2023), which incorporates the International Residential Code with Florida-specific amendments. For hurricane windows the governing chapters are:
- FBC Residential R301.2.1 — windborne debris and design wind speed
- FBC Residential R609 — exterior windows and doors, opening protection
- FBC, High Velocity Hurricane Zones (Chapter 16) — special rules for Miami-Dade and Broward
- ASCE 7-22 — design wind load calculations, referenced by FBC
What is the High Velocity Hurricane Zone (HVHZ)?
The HVHZ is a special jurisdiction defined in Florida statute as all of Miami-Dade County and all of Broward County. Within the HVHZ:
- Every exterior window, door, skylight, and roofing system must be Miami-Dade NOA approved
- Standard Florida Product Approval (FPA) is not sufficient on its own
- Installation must follow the NOA-approved drawings exactly (anchor type, spacing, embedment, perimeter sealant)
- A registered architect or engineer must seal the structural calculations for any new construction or major remodel
For background on the NOA certification, see our Miami-Dade NOA explainer.
Outside the HVHZ — windborne debris regions
Outside Miami-Dade and Broward, the FBC defines Wind-Borne Debris Regions (WBDR) based on the ASCE 7 ultimate design wind speed map. WBDR includes any area within 1 mile of the coast where the wind speed is 130+ mph, and any area where wind speed is 140+ mph.
In a WBDR, opening protection is required for new construction. This can be:
- Miami-Dade NOA approved impact windows or doors, or
- Florida Product Approval (FPA) impact windows or doors, or
- Permanent or temporary FPA-approved shutters covering every opening
Florida wind speed map (simplified)
| Region | Ultimate design wind speed | Opening protection required? |
|---|---|---|
| HVHZ (Miami-Dade, Broward) | 170–180 mph | Yes — NOA approved only |
| Palm Beach, Martin (coastal) | 160–170 mph | Yes — NOA or FPA |
| Treasure Coast / Space Coast | 140–160 mph | Yes within 1 mi of coast |
| SW Florida (Naples, Fort Myers) | 150–160 mph | Yes — NOA or FPA |
| Tampa Bay region | 140–150 mph | Yes within WBDR boundary |
| NE Florida (Jacksonville) | 130–140 mph | Yes within 1 mi of coast |
| Florida Panhandle (Pensacola) | 140–150 mph | Yes within WBDR boundary |
| Interior north Florida | 110–130 mph | Not generally required |
Numbers are approximate — the exact boundary for any address must be confirmed against the current ASCE 7 wind speed map and the local building department's WBDR overlay.
Design pressure (DP) — what your windows must withstand
Every window or door installed in Florida must have a design pressure (DP) rating that meets or exceeds the calculated pressure at that specific opening location. DP is calculated per ASCE 7 and depends on:
- Basic wind speed at the building location (from the ASCE 7 map)
- Exposure category (B: suburban / wooded, C: open terrain, D: open water — exposed coastal)
- Building height above ground
- Mean roof height and roof slope
- Effective wind area of the opening
- Opening zone — interior wall (Zone 4) vs corner wall (Zone 5), which has higher negative pressures
Typical residential DP requirements in South Florida
| Location | Typical DP (Zone 4 interior) | Typical DP (Zone 5 corner) |
|---|---|---|
| Inland Miami-Dade, single story | +45 / -55 PSF | +55 / -75 PSF |
| Inland Broward, two-story | +50 / -60 PSF | +60 / -80 PSF |
| Coastal Miami Beach, single story | +60 / -75 PSF | +75 / -100 PSF |
| Waterfront Fort Lauderdale, two-story | +70 / -85 PSF | +85 / -110 PSF |
| Tall condo (above 30 ft mean roof) | +80 / -100 PSF | +100 / -140 PSF |
NOA-approved products have a DP rating in the NOA itself — for example, a PGT WinGuard single hung might be rated for +75/-100 PSF in a specific size, allowing it to be installed in most South Florida residential corner applications. A licensed engineer or contractor confirms each opening's required DP and selects an NOA-approved product that meets or exceeds it.
A window cannot be installed if its DP rating is below the calculated required DP for that opening — even if it has an NOA. The NOA establishes that the product is impact-rated; the engineering calculation establishes whether that specific product is approved for that specific location.
The permit and inspection process
Step 1: Permit application
The installing contractor submits a permit application to the local building department (City of Miami, City of Coral Gables, Unincorporated Miami-Dade, City of Hollywood, etc.). The application includes:
- NOA number for each product being installed
- Approved sizes and design pressures for each opening
- Installation drawings showing anchor type, spacing, embedment, and perimeter sealant
- Engineering calculations sealed by a Florida-licensed PE (required for new construction; sometimes waived for like-for-like replacement)
Step 2: Permit issued
Permit fees in the tri-county region typically run $200–$600 depending on project scope. Some HOAs and historic districts (Coral Gables, Key Biscayne) add an Architectural Review Board (ARB) fee of $150–$400.
Step 3: Installation
Installation must follow the NOA install drawings exactly. The contractor logs anchor type, spacing, and torque per opening for the inspection record.
Step 4: Final inspection
The local building department sends a field inspector to verify the installation matches the NOA install drawings. If everything checks out, the permit is closed and the homeowner receives a final inspection certificate. If anything is non-compliant, the contractor must remediate and re-inspect before close-out.
Step 5: Wind mitigation inspection (optional but recommended)
After the building permit is closed, the homeowner hires a Florida-licensed wind mitigation inspector who issues an OIR-B1-1802 form (administered by the Florida Office of Insurance Regulation) documenting impact-rated openings. The form is submitted to the homeowner's insurer, unlocking the wind mitigation premium discount (typically 10–45% off the wind portion).
Replacement vs new construction
Florida code applies slightly different rules depending on whether you're building a new home or replacing windows in an existing one.
New construction
Every exterior opening must meet the current code: NOA approved in the HVHZ, NOA or FPA approved elsewhere in a WBDR. No "grandfathering" applies.
Like-for-like replacement
If you're replacing a window with a new window in the same opening and the same size, the new window must meet current code (NOA in HVHZ). Engineering calculations are typically streamlined or waived because the rough opening already exists.
Adding or enlarging openings
Adding a new opening (e.g., converting a wall to a sliding glass door) requires full engineering calculations and a more detailed permit review. Enlarging an existing opening typically requires structural reinforcement around the new rough opening.
Homeowner's checklist
Before signing a contract for impact windows or shutters in Florida, confirm the contractor will:
- Pull the permit with the local building department (not "homeowner-pull")
- Provide the NOA number for every product on the proposal — and let you verify them on the Miami-Dade Product Control online directory
- Confirm the DP rating of each selected product meets or exceeds the calculated required DP for each opening
- Provide engineering calculations if required (most new construction; sometimes replacement work)
- Schedule a final inspection through the local building department
- Deliver a copy of the final inspection certificate at job completion
- Provide product warranty paperwork transferable to the homeowner
If a contractor pushes back on any of these or offers to "save money by skipping the permit," that is a clear warning sign. Walk away.
Quote that meets code — every time
Every EZPZ Windows quote lists NOA numbers, design pressures, and permit handling — so you know exactly what's being installed and how it complies. Get yours in under 2 minutes.
Start My Free Quote →Frequently asked questions
- Are hurricane impact windows required by law in Florida?
- In the HVHZ (Miami-Dade and Broward), every exterior opening needs opening protection — impact windows or shutters, both Miami-Dade NOA approved. In other Florida coastal wind zones, opening protection is required for new construction, and the choice of impact windows vs. shutters is up to the homeowner.
- What is the design pressure my windows need to meet?
- Calculated per ASCE 7 based on location, exposure category, building height, and opening zone. Typical South Florida residential DPs range from +50/-60 PSF interior to +85/-110 PSF on tall waterfront corners. The contractor or engineer calculates required DP per opening and selects NOA products that meet it.
- Do I need a permit to replace windows in Florida?
- Yes. Every county requires a permit for any window replacement that touches the exterior envelope. Permit fees typically run $200–$600. The contractor pulls the permit and the building department inspects.
- What happens if I install windows without a permit?
- You can't legally sell the home without disclosing it, you forfeit the insurance discount (no OIR-B1-1802 form possible), and any hurricane claim may be denied for non-compliance. Pull the permit.
- Is the Florida Building Code different in each county?
- The base FBC is statewide. The HVHZ chapters add stricter requirements for Miami-Dade and Broward. Local building departments and HOAs may add additional procedural requirements (ARB approvals, historic district reviews) but cannot weaken the base FBC requirements.
- Does Florida code require energy-efficient glass (Low-E)?
- Not as a hurricane requirement. Energy code (Chapter 13) imposes U-factor and SHGC limits that vary by climate zone. Most NOA-approved impact windows can be ordered with Low-E coatings (Lowe-366) to meet stricter energy code requirements or Energy Star certification.