Can You Install Impact Windows on a Home That Still Has the Original Single-Pane Glass?
Yes, and it’s actually one of the most common scenarios contractors handle in older South Florida neighborhoods. Single-pane windows offer almost no structural resistance during a storm, so swapping them out for impact-rated glass is a straightforward upgrade, though the contractor will need to assess your existing frame openings before any glass gets ordered.
What the Process Looks Like on an Older Home
Frame Condition Comes First
Before anything else, a qualified installer will check whether your existing frames are worth keeping. Older Boca Raton homes, especially those built before the 1990s, frequently have wood or aluminum frames that have taken on moisture damage, rot, or corrosion over the decades. If the frame is compromised, the new impact unit can’t be anchored securely enough to meet Miami-Dade County Notice of Acceptance (NOA) standards. In that case, the frames come out too, and the rough opening gets prepped for a full replacement unit.
This is why a detailed site visit matters. A contractor who just measures your window dimensions and quotes you a price without looking at the frames is skipping a step that could cost you later during inspection.
Glass Specs Change Depending on Your Opening Size
Larger openings require thicker laminated glass to meet Florida Building Code wind-load requirements. A small bathroom window and a wide living room picture window won’t get the same glass spec, even if they’re in the same house. Your installer will pull the relevant product approval documentation, which tells them exactly which glass thickness and frame depth is approved for your specific opening dimensions and your home’s wind exposure zone.
Homes near the coast or in higher wind zones may require units tested to higher design pressures. Impact windows are not a one-size product, and a good contractor treats each opening individually.
Permitting Still Applies to Retrofit Work
Some homeowners assume that because they’re replacing windows with something “better,” the permit process might be shorter or optional. It isn’t. Permit-required installation protects you, since the inspector’s sign-off is what makes the upgrade count for your insurance discount. Skipping it can void your coverage or create headaches when you sell. The city’s building department reviews the product approvals, the installer’s license, and the installation drawings before any work begins.
If you’re curious about what the full process looks like before you reach out to a contractor, the STS FAQ page breaks down common questions about permits, timelines, and what to expect on installation day.
What Single-Pane Homeowners Often Don’t Expect
Lead Times Can Vary Significantly
Impact windows are custom-manufactured to your exact rough opening size. That’s not something sitting on a shelf at a big-box store. Depending on the manufacturer and the current order volume, lead times in South Florida can run anywhere from six to sixteen weeks. Homes with a large number of openings or unusual sizes tend to sit on the longer end. Planning ahead, especially before hurricane season ramps up in June, keeps you from being caught mid-project when the first storm watch rolls in.
Noise and UV Reduction Are Side Benefits Worth Knowing About
Single-pane glass does almost nothing to block outdoor noise or ultraviolet light. The laminated interlayer inside impact glass cuts UV transmission significantly and also dampens sound, which residents near busy roads or flight paths tend to notice immediately after installation. It’s not the primary reason people replace their windows, but it’s a real, measurable difference from day one.
You can browse the manufacturers and product lines available through STS on the manufacturers page to get a sense of what’s available before scheduling a quote.
Related Questions
Do I need to replace all my windows at once, or can I do it in phases?
Phased replacement is possible, but every opening that still has standard glass will need to be covered with an approved shutter during a storm until it’s replaced. Many homeowners in the area choose to do the full house at once to avoid managing two protection systems and to simplify the permitting and inspection process.
Will my homeowner's insurance recognize the upgrade if I replace just some of the windows?
Most Florida insurers require all openings, including doors and skylights, to have approved protection before they apply a wind mitigation discount. A partial upgrade may not qualify for the full premium reduction. Get a free quote and talk to your insurer at the same time, so you know exactly what threshold you need to hit. For the official wind mitigation form requirements, the Florida Department of Financial Services has the current documentation standards. Local building code specifics for Boca Raton fall under Palm Beach County’s building inspection authority, which is worth checking before you start the permit process.
