Are Impact Windows Required in Florida? County-by-County Rules

Florida Building Code §1626 requires every exterior glazed opening in the High-Velocity Hurricane Zone to be impact-rated or protected by a permanent code-approved shutter system. This rule applies to all new construction and any permitted window replacement in Miami-Dade and Broward counties. Miami-Dade sets its Risk Category II design wind speed at 175 mph. Broward sets its equivalent speed at 170 mph. Those figures are not suggestions — they are the minimum performance thresholds every product must meet before it earns a Miami-Dade Notice of Acceptance (NOA). An NOA is a product approval document that local building departments require before issuing a permit. Without a valid NOA, a window cannot be legally installed in either county, regardless of how strong a manufacturer claims it is. The Florida Building Code publishes the full text of §1626 and its referenced wind-speed maps online at no cost.

The High-Velocity Hurricane Zone covers exactly 2 counties: Miami-Dade and Broward. Every other coastal county from Palm Beach north to Escambia falls inside the Wind-Borne Debris Region instead. The WBDR extends about 5 miles inland from tidal water along Florida's entire coastline. Inside the WBDR, the same impact-or-permanent-shutter requirement applies to every glazed exterior opening. That means a homeowner in Palm Beach County or Martin County faces essentially the same opening-protection obligation as one in Miami. The key difference is the design wind speed. WBDR counties outside HVHZ typically design to 130 mph to 160 mph. That is less than the 170 mph or 175 mph used in HVHZ. Products approved for HVHZ always satisfy WBDR requirements. The reverse is not always true. Always verify that a window's product approval matches your county's specific design pressure before purchase.

Inland Florida wind zones rated at Risk Category II at or below 130 mph do not require impact protection under the current statewide code. Homeowners in those areas may use standard single- or double-pane windows without a shutter system and still pass a building inspection. However, 2 important caveats apply. First, local jurisdictions — individual cities and counties — are allowed to adopt stricter rules than the state minimum. Always confirm with your local building department before assuming the state floor applies. Second, the Florida Building Code 9th Edition takes effect on December 31, 2026, and it expands the 160 mph performance envelope to all new construction within 5 miles of tidal water. That change will pull some previously exempt neighborhoods into mandatory opening-protection territory. Homeowners near the coast who are planning a window project in 2025 or early 2026 should verify whether their parcel will fall inside the new boundary before their project closes.

Many Florida homeowners ask whether impact windows are required in Florida specifically to lower their insurance premium. The answer involves 2 separate concepts. Code compliance is a legal requirement tied to the permit process. Insurance credits are a financial benefit tied to your wind mitigation inspection report. Florida insurers use Form OIR-B1-1802 to document opening protection. A home with every exterior opening covered by impact-rated products earns the highest Opening Protection credit tier. That credit can reduce the wind portion of a Citizens Insurance or private-carrier premium by 25% to 45% depending on the county and coverage level. Homes with shutters only earn a lower credit because shutters require active deployment. Our guide on insurance savings with impact windows and wind mitigation breaks down the exact credit tiers by protection class. Pairing a code-compliant installation with a fresh wind mitigation inspection is the fastest way to recover a portion of your upfront investment.

The Florida Building Code 9th Edition takes effect on December 31, 2026. It expands 160 mph envelope requirements to all new construction within 5 miles of tidal water. This change affects coastal areas that previously fell just outside the WBDR boundary. Homeowners in those transitional zones who complete a permitted project before December 31, 2026, can finish under the current 8th Edition rules. Projects permitted on or after that date must comply with the new 9th Edition standards. The practical impact for buyers is straightforward. Windows rated only to 130 mph or 140 mph may no longer satisfy code in areas that were previously exempt. Our dedicated Florida Building Code impact window requirements 2026 page covers the full scope of changes with product approval implications. If you are unsure whether your property falls inside the new 160 mph envelope, check with your local building department. They can confirm using updated wind-speed maps issued with the 9th Edition.

Understanding whether impact windows are required in Florida is only the first step. Selecting the right product for your specific wind zone and exposure category is equally important. A window with a Miami-Dade NOA is automatically acceptable in Broward and in all WBDR counties. However, the frame material, glass thickness, and installation method must all match the conditions listed in the NOA. Our best impact window brands South Florida 2026 guide compares leading manufacturers by design pressure, warranty terms, and local availability. For homeowners weighing glass options, the double-pane vs. triple-pane windows guide explains trade-offs in thermal performance and structural ratings. Most South Florida homes in the HVHZ do well with laminated low-E double-pane units. These units are rated to 200 psf positive and negative pressure. Triple-pane adds thermal value but also adds weight. Some older frame openings cannot support that weight without structural modification.