If you own a home anywhere along Florida’s coast — or within about 30 miles of it — the sliding glass doors on your property are regulated by Chapter 16 of the Florida Building Code. Most homeowners have never heard of it until they try to replace a door and the permit office asks for a Florida Product Approval number. This guide translates the code into plain language, walks through what applies county by county, and explains exactly what you need to know before replacing, repairing, or upgrading a sliding door in Florida.

What Is FBC Chapter 16 and Why It Applies to Sliding Doors

The Florida Building Code is the statewide construction code that every Florida jurisdiction must enforce. Chapter 16 covers structural design — the rules governing how buildings and their components must be designed to resist wind, water, and impact loads. For sliding glass doors, Chapter 16 matters because large glazed openings are the single largest structural vulnerability on most Florida homes.

The code’s current edition is the 2023 Florida Building Code, 8th Edition, which took effect December 31, 2023. It replaced the 7th Edition from 2020. The wind speed design maps in Chapter 16 are based on ASCE 7-22, the American Society of Civil Engineers’ wind-load standard. Florida adopts these maps verbatim, then adds its own state-specific enforcement rules for the Wind-Borne Debris Region and High-Velocity Hurricane Zone.

Wind-Borne Debris Region: Which Florida Counties Are In?

The Wind-Borne Debris Region (WBDR) is the area where Florida Building Code requires impact protection for windows and sliding doors. Its boundary is defined by design wind speed — specifically, any area where the design wind speed is at or above 130 mph (ultimate), plus any area within one mile of the coast where the design wind speed is at or above 115 mph.

In practical terms, the WBDR covers:

• All of Florida’s Atlantic coast — from Jacksonville (Duval County) south to Miami-Dade and the Keys
• All of Florida’s Gulf coast — from Pensacola south through Naples and down to the Keys
• Inland strips in Brevard, Indian River, Martin, Palm Beach, Broward, Miami-Dade, Collier, Lee, Charlotte, and counties that sit within the 130-mph zone
• Partial inland coverage in Orange, Osceola, Polk, Highlands, and Okeechobee counties — the WBDR line cuts through these counties but does not cover all of them

HVHZ vs WBDR: Key Differences for Coastal Homeowners

Within the Wind-Borne Debris Region, there’s a stricter designation: the High-Velocity Hurricane Zone (HVHZ). This zone covers only Miami-Dade County and Broward County, and it applies the toughest testing protocols in the entire code.

For homeowners in Broward County, this means you cannot install a regular impact door from another state and expect it to pass inspection — it must carry a Miami-Dade NOA. For the rest of the coast, the less-strict Florida Product Approval is acceptable.

How to Read a Florida Product Approval (FPA) Number

Every impact-rated sliding door sold in Florida must carry either a Florida Product Approval (FPA) number or a Miami-Dade Notice of Acceptance. You’ll find this number on:

• A permanent label or sticker on the door frame (usually along the top or side jamb)
• The manufacturer’s documentation included at installation
• The manufacturer’s website in the “product approvals” or “compliance” section

An FPA number typically looks like FL#####-R##. Example: FL12345-R10. The first number is the product ID; the R-number is the revision. When a product gets updated, the R-number increments. Always verify the latest R-number on the Florida Department of Business and Professional Regulation’s product approval database.

Large Missile vs Small Missile Impact Testing Explained

Chapter 16 uses two impact test classes:

County-by-County Quick Reference for Alpha Service Areas

Here’s how the code applies to every county Alpha Sliding Doors services:

When FBC 2023 (8th Edition) Changed the Rules from the 7th Edition

The 2023 Florida Building Code updated several Chapter 16 provisions that affect sliding doors. The most significant changes:

1. Updated wind speed maps. The 8th Edition adopts ASCE 7-22 wind speed maps, which slightly redraw the WBDR boundary in a handful of inland Florida counties. If your property sat just outside the old WBDR and you’re due for a permit now, confirm the new line.
2. Clarified enclosed vs. partially enclosed buildings. A home with unprotected glazed openings is classified as “partially enclosed” during a hurricane — meaning the internal pressure load increases dramatically. The 8th Edition made this classification more rigorous, pushing more homeowners toward full impact protection.
3. Updated garage door requirements. Garage doors now have tighter pressure and impact standards in the WBDR. This matters for sliding doors because insurance wind-mitigation credits often require every opening to qualify.
4. Revised anchorage provisions. Chapter 16 now cross-references updated fastening tables that apply to sliding door frame anchorage in CMU, wood, and concrete substrates.

Permits and Inspections Required for Sliding Door Replacement in Florida

Most Florida counties require a building permit for sliding door replacement. The permit process typically involves:

Frequently Asked Questions