NextPermit

If you live in Florida long enough, you stop thinking of windows as just glass and frames. They are the first line of defense between your family and a hurricane. And yet, every year, homeowners across the state install new windows without a permit, sometimes because a contractor told them it was fine, and sometimes because nobody thought to ask.

This article is for both groups.

The 2026 Florida Building Code has specific, non-negotiable requirements for window replacements. Getting this wrong does not just mean a fine. It can mean your insurance company walks away from a storm claim because your windows were never inspected. In South Florida especially, that is not a hypothetical. It happens.

Why Florida treats windows differently than other states

Florida sits in one of the most hurricane-active regions in the world. The state learned hard lessons from Andrew in 1992 and has been tightening building codes ever since. Windows are not just cosmetic. When a window fails during a storm, it changes the internal pressure of your home dramatically, and that pressure change is what causes roofs to lift off.

This is why the Florida Building Code requires every replacement window to prove, on paper, that it can take a beating before it ever gets installed.

The HVHZ: If you live in Miami-Dade or Broward, read this carefully

Florida is divided into wind speed zones, and the most demanding of all is the High Velocity Hurricane Zone, known as the HVHZ. This zone covers Miami-Dade and Broward counties and has stricter requirements than anywhere else in the state.

In the HVHZ, your replacement windows must be impact-rated and must pass two specific tests: resistance to large missile impact (a 9-pound wooden pole fired at 50 feet per second) and extreme wind pressure. These are not marketing claims. They are engineering certifications documented in the Florida Product Approval number assigned to each window model.

If you live outside the HVHZ, requirements are less intense but still mandatory. Your wind zone determines exactly what your windows need to withstand.

What is a Florida Product Approval number and why it matters

Every window installed in Florida must carry a valid Florida Product Approval number. This number, issued by the Florida Building Commission, certifies that the specific combination of glass, frame, and hardware has been tested and approved for use in Florida conditions.

When you apply for your permit, you will need to provide this number. When the inspector shows up, they will verify it. If your contractor installs windows that do not have a current, valid approval number, your permit will not close, and you will have a problem on your hands that is much more expensive than doing it right the first time.

Always verify the approval number yourself at the Florida Building Commission’s product approval website before signing any contract with a window company.

Step-by-step: How to replace windows legally in Florida (2026)

Step 1. Determine your wind zone

Go to your county building department website or the Florida Building Code wind speed map. Confirm whether your property is in the HVHZ or another wind zone. This is not optional information. It determines every product you are allowed to buy.

Step 2. Select windows with a valid Florida Product Approval number

Before you fall in love with a window style, confirm the model has a current Florida Product Approval. Ask the manufacturer or contractor for the NOA (Notice of Acceptance) document in Miami-Dade and Broward, or the statewide approval number elsewhere. Verify it yourself. Do not take anyone’s word for it.

Step 3. Prepare your elevation drawings and window schedule

Your permit application requires elevation drawings showing where each window sits on the exterior of the home, along with a window schedule listing the size, model, approval number, and installation specifications for each opening. Your contractor or a drafting service can prepare these, but you should understand what they contain.

Step 4. Submit your permit package online

Most counties in Florida now process permit applications through online portals. Upload your elevation drawings, window schedule, product approval documentation, and proof of contractor license. Pay the application fee, which varies by county and project value.

Step 5. Wait for the review period

Under HB 267, effective January 2025, local governments must review single-family home permits within specific timeframes. Projects under $15,000 get a 5-business-day review if processed by a government reviewer. Projects involving structures under 7,500 square feet have a 30-business-day maximum. If your municipality misses these deadlines, they may owe you a refund of your application fees.

Step 6. Schedule your rough inspection

Before installation begins, some jurisdictions require a rough or pre-installation inspection to verify the existing opening conditions. In high-wind zones like Miami-Dade, it is common to have two inspections: one during the process to verify the window buck and attachment method, and one final. Check with your local building department whether this applies to your project.

Step 7. Install the windows

Follow the approved installation drawings exactly. The inspector will compare the actual installation against what was submitted. Deviations, even minor ones, can cause your final inspection to fail.

Step 8. Schedule the final inspection

Once all windows are installed, call for the final inspection. The inspector will verify product approval numbers, installation method, flashing, and sealing. Only after this inspection passes is your permit considered closed.

Step 9. Keep every document permanently

Store your closed permit, the product approval documentation, the NOA, and the inspection records with your property paperwork. When you sell your home or file an insurance claim after a storm, these documents are what prove your windows are code-compliant. Without them, you are starting from zero in a conversation you do not want to have.

The 25% rule: plan your project carefully

Florida has a regulation that catches many homeowners off guard when they decide to replace windows gradually to spread out the cost. If you replace 25% or more of the total window and door opening area of your home within a 12-month period, your entire home may be required to come into full compliance with the current Florida Building Code. That can mean upgrading windows you were not planning to touch yet.

This rule is enforced under the Florida Building Code, especially in high-wind areas. If you are planning to do your windows in phases, talk to your building department first and map out a timeline that avoids triggering the 25% threshold unintentionally.

A word about contractors who say you do not need a permit

Some contractors, particularly smaller operations, will tell you that window replacements do not require a permit. In Florida in 2026, that is not true for most replacements. It may be true for very specific situations involving like-for-like replacements in certain jurisdictions, but the only person who can confirm that is your local building department, not your contractor.

If a contractor is unwilling to pull a permit, that is a signal worth taking seriously. A licensed contractor in Florida is legally responsible for the work they perform. A contractor who avoids permits is a contractor who is avoiding accountability.

One denied insurance claim after a hurricane will cost you more than every permit fee you ever paid, combined.

Should you always check official sources?

Yes, always. Wind zone maps, product approval databases, and fee schedules are updated regularly. This guide reflects the Florida Building Code and current legislation as of 2026, but your local building department is the final authority on what applies to your specific property and project. Use this article to understand the process, then confirm every detail with your county or city before signing any contract or submitting any application.

⚠️⚠️ This article is for informational purposes only and does not constitute legal or professional advice. Always verify permit requirements with your local building department before beginning any construction or installation work.⚠️⚠️