Did the previous owner install impact windows? Are yours really rated? Here is a simple way to check.
1. Look for a label
Many impact windows have a label on the frame or glass spacer, or a sticker left from installation. It may list the manufacturer, a product approval number and design pressure rating.
2. Check the glass
- Look in the corner for a small etched marking.
- Look at the glass edge. Laminated glass often shows a visible layer between two panes.
- Tap lightly. Laminated glass often sounds duller than regular glass.
3. Check the permit records
Installation should have a permit with product approvals attached. Your city or county building department can often pull the file by address. You may also find a wind mitigation inspection form from an insurer.
4. Look up the approval
For Miami-Dade and Broward, the product must have a valid Notice of Acceptance. See what the labels mean.
5. Ask a pro
If you are still not sure, a licensed glazing contractor can inspect the windows and tell you. This matters for insurance, resale and your own safety. Our team is happy to look, see our window replacement page or request a quote.
Why this matters
Insurers, buyers and your own safety plan all depend on knowing whether your openings are really protected. A window can look new and still not be impact rated, and an older window may be rated even if it looks plain. Checking takes a few minutes and can save money.
What the labels usually show
- The manufacturer's name or logo.
- A product approval or NOA number.
- Design pressure ratings.
- Impact rating information.
Labels may be on the glass spacer, the frame edge inside the sash track, or on a removable sticker that was taken off after installation.
Use your documents
- Permit records: request the file from your building department by address.
- Closing documents: if you bought the home, look for wind mitigation reports and contractor invoices.
- Insurance policy: credits for opening protection may indicate prior verification.
A quick physical test
Many owners tap the glass lightly with a pen: laminated glass often sounds duller and less "ringy" than standard glass. Looking at the cut edge of a unit can show a visible layer. These are only hints, not proof.
Verify with a professional
If you need certainty, for example before listing a home or applying for a policy, a licensed contractor or wind mitigation inspector can document it. See wind mitigation inspections and what the labels mean.
Frequently Asked Questions
Can I tell by looking at the glass?
Sometimes. Laminated glass often shows a faint etched mark in a corner, and the edge may show layers. A label or paperwork is more reliable.
Where do I find the NOA number?
It is usually on the product label or in your permit file. Your contractor or building department can provide it.
What if I cannot find any labels?
Ask a licensed contractor to inspect. They can check the glass and frame and help you find permit records.
What if my windows have no permit on file?
Ask a licensed contractor how to proceed. Unpermitted work can create problems for insurance and sales, and some jurisdictions allow after-the-fact permitting.
Ready to talk about your project? Get a free written quote (usually within 48 hours) or call 786-343-4729. EZ Glazing Corp is licensed and insured (License #SCC131153391) and handles the permit and inspection.