Most hurricane preparation guides tell you to shutter your windows. Almost none of them mention the garage door, which is the largest opening in the average house and the one most likely to fail. This is what the code actually requires here, and how to find out whether your door meets it.
Why the Garage Door Is the Weak Point
When a garage door fails in high wind, the problem is not the lost door. It is what happens next: wind enters the garage and pressurizes the inside of the house. That internal pressure pushes up on the roof at the same moment the wind outside is pulling it. This combination is what removes roofs.
Structural engineers have understood this since Hurricane Andrew in 1992, which is precisely why South Florida rewrote its building code afterward.
What the High Velocity Hurricane Zone Means
Miami-Dade and Broward are the only two counties in the United States designated as a High Velocity Hurricane Zone under the Florida Building Code. Products installed here face the strictest testing requirements in the country — stricter than the rest of Florida.
For a garage door, that means two separate ratings:
- Wind load. The door must withstand sustained pressure without buckling or leaving its track.
- Impact. The door must survive a large missile impact test — a nine-pound piece of lumber fired at roughly 34 miles per hour — followed by thousands of pressure cycles.
What a Notice of Acceptance Is
A Notice of Acceptance, or NOA, is the document Miami-Dade County issues confirming that a specific product passed those tests. It is product-specific and it expires — an NOA from 2009 is not current.
This matters to you in three concrete ways. Your permit will not pass inspection without it. Your insurer may ask for it when calculating a wind mitigation discount. And a buyer or their inspector will ask for it when you sell.
How to Check Your Existing Door
Look for a label or stamped plate on the inside of the door, usually on one of the lower sections or near a hinge. It will list a manufacturer, a model, and an approval number. If there is no label at all, the door almost certainly predates the requirement.
An unrated door is not illegal to keep. It becomes an issue when you replace it — at that point the new door must be rated and permitted.
Does It Cost More?
Less than people expect. Rated doors are effectively the standard product in this market now, because manufacturers do not maintain a separate unrated line for two counties. Our installed pricing runs $1,200 to $2,400 for a single door and $2,200 to $3,200 for a double, permit included.
Where cost does climb is glass. Impact-rated windows in a door section add real money. That is a genuine choice — natural light against several hundred dollars.
Do I Need a Permit?
Yes. Every municipality in Miami-Dade and Broward requires a permit for garage door replacement. We pull it as part of the job and hand you the approval documentation at the end. If a company offers to install without a permit, understand what you are accepting: no inspection, no paper trail, and a problem waiting at closing when you sell.
What About Bracing Instead?
Temporary bracing kits exist and are better than nothing on an unrated door. But they have to be installed before the storm, removed after, and they protect against wind load only — not impact. They are a stopgap, not a substitute.
Get an Honest Assessment
We will look at your door and tell you what it is rated for and whether replacing it makes sense. No charge for the estimate. More on our hurricane impact doors page, and see our service areas in Miami-Dade and Broward.
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