The honest short answer
Impact windows can lower your homeowners insurance premium, but not automatically just by being installed, and not by any fixed percentage we can promise you in advance. The mechanism that makes it possible is real and legally required — Florida law (Fla. Stat. §627.0629) requires insurers to offer premium credits for verified wind-resistant construction features. But the credit only applies once those features are documented through a formal inspection, and the actual dollar amount is set by your specific insurance carrier's own filed rate plan, not by us, not by the window manufacturer, and not by a general industry average.
How the credit actually gets applied
Installing impact windows, by itself, changes nothing on your policy. The credit only exists once a qualified inspector documents your home's features — including opening protection — on the OIR-B1-1802 Uniform Mitigation Verification Inspection Form, and you submit that form to your insurer. We cover that inspection process in detail in our wind mitigation inspections guide and the form itself in our OIR-B1-1802 guide. Skipping the inspection step means skipping the credit, regardless of how good your windows actually are.
Why we won't quote a percentage
Every Florida insurer files its own wind mitigation credit schedule with the Office of Insurance Regulation, and those schedules differ — sometimes significantly — from carrier to carrier. The credit amount also depends on factors specific to your home and policy: what other wind mitigation features you already have (roof shape, roof-to-wall connections, secondary water resistance), whether your opening protection is complete across every window, door, and garage door or only partial, your coverage limits, and your carrier's overall risk model for your area. Any company that promises you a specific discount percentage before an actual inspection and your actual carrier's rate schedule are involved is telling you something they can't actually back up.
Why complete opening protection matters more than partial
One detail that surprises a lot of homeowners: a wind mitigation inspection generally credits opening protection based on whether every exterior opening is protected consistently, not just some of them. A home with impact windows throughout but one unprotected garage door, or a home where the patio slider was skipped, may not receive the full opening-protection credit it would with complete, consistent protection — because a single weak point can compromise the pressure envelope of the whole structure in a storm. If you're doing a phased project, it's worth knowing that the insurance credit picture may look meaningfully different at each phase.
What does correlate with a bigger difference
While we won't promise a number, the general pattern in how these credit systems are structured is that more complete, better-documented mitigation tends to produce more credit than partial or undocumented mitigation. Impact windows paired with impact doors and a code-rated garage door, verified through a current (post-April 1, 2026) OIR-B1-1802 inspection performed by a qualified inspector, gives your insurer the most complete picture to work from — and removes any ambiguity that could limit the credit.
Other reasons impact windows are worth it beyond the premium question
Even setting the insurance credit aside, impact windows offer real value: no shutter routine before a storm, better noise attenuation from laminated glass, forced-entry resistance, and UV blocking that helps protect flooring and furnishings. The insurance credit is a genuine, real benefit layered on top of those — just not one with a number we can hand you before an actual inspection happens.
What we'd actually recommend
If premium impact is a major factor in your decision, the most useful path is: get your home assessed for the project, complete the installation with full opening protection where possible, then schedule a wind mitigation inspection with a qualified inspector and submit the resulting OIR-B1-1802 form to your carrier. At that point, your agent can tell you the real number for your specific policy — which is the only number that actually matters.
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