What impact windows are and how they are tested
An impact window is a window unit built from two pieces of glass bonded to a tough plastic interlayer (laminated glass), set in a frame that is anchored and reinforced to hold that glass in place under load. When a windborne object hits it, the outer glass may crack, but the interlayer holds the fragments and the glass stays in the frame. The opening stays sealed, so wind and rain do not enter and pressurize your home. That is the real job of the product: protecting the building envelope, not just resisting a single hit. "Hurricane windows" and "impact windows" describe the same category, and we explain the wording in hurricane windows vs impact windows.
Approval is not a marketing claim. To be sold for code-compliant use, a product is tested against a large-missile impact (a piece of lumber fired at the glass) followed by thousands of positive and negative pressure cycles that imitate hurricane gusts. Only products that pass earn a product approval. If you want the plain-language version of what those ratings mean, read impact window ratings explained, and for the worst-case question see can impact windows withstand a Category 5 hurricane.
A few related points people often mix up. Glass makeup matters for noise, UV and efficiency, so see glass types. Frame material matters for cost and appearance, so see vinyl vs aluminum and the aluminum vs vinyl breakdown. Operation style matters for egress and price, so see single hung vs double hung and types of impact windows. Color options are covered in frame colors and black frame impact windows.
Impact windows vs shutters, film and regular glass
Impact glass is protection that is always on. Shutters and panels protect only if someone installs them before the storm, and you are trusting the calendar and your schedule. Compare the options in impact windows vs hurricane shutters, vs storm panels and roll shutters, and vs accordion shutters. Security film can add some protection to existing glass, but it is a different product with different limits, which we explain in window film vs impact glass. Standard windows are not a code-compliant option in hurricane-prone openings; see impact windows vs regular windows. Whether the whole investment pays off for your situation is in are impact windows worth it, and the case for replacing older units is in why replace windows in Florida and older homes.
Code requirements: HVHZ vs the rest of Florida
Florida has two levels of wind-code scrutiny that matter to you. The High-Velocity Hurricane Zone (HVHZ) covers Miami-Dade and Broward counties. There, products must carry a Miami-Dade Notice of Acceptance (NOA), pass the large-missile impact and cyclic pressure protocols, and be installed under a permit with inspections. Outside the HVHZ (Palm Beach County, the Treasure Coast and much of the state) products are typically approved through the Florida Product Approval system (FPA) or an NOA, and local building departments enforce the wind-borne debris rules that apply in their area.
- Broward and Miami-Dade: replacing even one opening generally means using NOA-approved impact products. See Broward, Miami-Dade County guide and Miami-Dade.
- Palm Beach County: a different jurisdiction with its own paperwork habits. See Palm Beach County and West Palm Beach.
- The 25% rule: outside the HVHZ, replacing a large enough share of a home's openings can require the rest to meet current code. Read the Florida 25% rule explained.
- Code changes: the code is updated on a cycle. See the 9th Edition 2026 changes and Florida hurricane window requirements for 2026.
Rules vary by building department and can change, so treat any general guide, including this one, as a starting point and confirm details with your local jurisdiction or with the person pulling the permit.
NOA and Florida Product Approval: what to check on a quote
Before you agree to any product, ask for the approval number and confirm it covers the exact size, configuration and design pressure of the window you are buying. An NOA or FPA document lists the approved series, sizes, glass types and anchoring requirements. A window can belong to an approved product line and still be outside its approved size, which is a common reason inspections fail. Also check that the approval is current, since approvals expire and get renewed. Our short primer on Miami-Dade NOA certification walks through the document. If a seller cannot show the approval for the specific unit, treat that as a red flag.
Product lines also get discontinued and approvals lapse. Read what discontinued impact window lines mean for repairs and replacement glass if you own an older system.
PGT, ESW and Mr. Glass: real differences
The three brands we work with most are all approved for South Florida use, so the choice is about budget, features and availability rather than whether they are "real" impact windows.
- PGT: the premium tier, with the widest range of configurations and a strong reputation in coastal and high-design projects. Typical installed range is $650-$1,100 per window. Reviewed in our PGT WinGuard review.
- ESW: the value pick for most residential projects, with a broad catalog. Typical installed range is $500-$800 per window. See our ESW review.
- Mr. Glass: the budget tier, often a good match for rentals and cost-driven replacements. Typical installed range is $400-$650 per window. See our Mr. Glass review.
Compare all three side by side in PGT vs ESW vs Mr. Glass and best impact window brands in Florida, or browse the brands page. Warranty terms differ by manufacturer and by installer, so read the warranty guide before you sign. Whichever brand you pick, installation quality matters as much as the glass, which is why choosing the right contractor and choosing the right windows deserve their own attention.
What impact windows cost, and what moves the price
Typical installed prices per window in 2026 run about $400-$650 for Mr. Glass, $500-$800 for ESW and $650-$1,100 for PGT. For a typical 10-window home, that is roughly $8,000-$22,000 installed when you buy in-stock inventory, compared with $18,000-$28,000+ through a custom showroom. Those are typical ranges, not quotes. Your number depends on:
- Size and count: larger openings cost more than small ones.
- Brand and series: the tier you choose sets the base price.
- Frame and glass: color, tint, low-E and sound-laminated options can add cost. Details in glass types.
- Operation type: fixed, single hung, horizontal roller and casement units price differently.
- Doors: sliders and entry doors cost more than windows. See impact doors, impact entry doors and door replacement.
- In-stock vs custom: factory-clearing inventory can be far cheaper than a made-to-order unit. See in-stock vs custom and used impact windows.
- Building factors: condos, HOAs, older openings and high floors add work. Materials can also move with the market; see 2026 tariffs.
Go deeper in how much impact windows cost in South Florida (2026), impact windows cost in Florida, the installation cost guide and the cost calculator. If you only need a pane replaced, see impact glass replacement cost. Payment help: financing, the 2026 tax credit page and My Safe Florida Home.
Insurance discounts and wind mitigation
Florida law (Statute 627.0629) requires insurers to discount windstorm premiums for homes with qualifying wind-resistive features. For homes with impact-protected openings the typical discount is around 30-45%, often $1,500-$3,500 per year, though your carrier, your home's age and your roof all affect the real number. To claim it you generally need a wind mitigation inspection after installation, documented on form OIR-B1-1802, and you send the result to your insurance company. Ask your agent to re-rate the policy once the report is filed.
Read the full breakdown in the insurance discount guide and how the inspection works in the wind mitigation inspection guide. If you already have storm damage, see the hurricane insurance claim guide. Resale is covered in home value and selling your home.
Permits and inspections
Window replacement in Florida requires a building permit. The permit is pulled before work starts, the products installed must match the approvals submitted, and the job must pass inspection. For buyers who choose installation through us, we coordinate the permit process so the paperwork and the product approvals line up. If you install through your own contractor, make sure they are handling the permit and can tell you when inspections are scheduled.
County-by-county specifics live in the Broward, Miami-Dade and Palm Beach permit guide and the Florida permit overview. Homeowner association approval is a separate step: see HOA rules and the HOA approval walkthrough. Condo owners should also read best impact windows for condos and condo and high-rise projects.
Installation and timelines
Timelines depend mostly on where the product comes from. In-stock windows can be picked up the same week, and a typical in-stock project runs about 1-3 weeks from order to completion. A custom factory order typically runs 8-20 weeks because the units are made to your measurements. The physical install for a typical home is usually a matter of days, but permit approval, HOA sign-off and inspection scheduling are what stretch the calendar.
The steps are covered in the installation process guide, how long installation takes and installation in South Florida. For doors see sliding glass door installation. Timing your project before storm season helps; see the hurricane season guide. Special situations have their own pages: new construction, coastal homes, historic homes, manufactured homes, commercial buildings, rental properties and vacation homes.
How to measure your windows
Measurements decide whether an in-stock unit fits and whether a custom order arrives right. The short version: measure the width and height of the opening in three places (top, middle and bottom for width; left, middle and right for height), record the smallest number, note the operation type (fixed, single hung, roller, casement) and which side the operating sash is on when viewed from outside, and photograph each opening. Do not rely on the old window frame alone, because the frame can differ from the opening.
Full instructions are in how to measure impact windows. Standard sizes are listed on the sizes page. Final field measurements should always be confirmed by the installer before anything is ordered.
See it on your home and get an instant price
Two online tools shorten the decision. The visualizer lets you see impact windows and doors on a home before you commit, and Instant Price gives you a price estimate from your sizes and choices without waiting on a callback. The estimate is a starting point; your final price is confirmed once measurements and product selections are verified. To look at real stock, browse the marketplace, or start with buy impact windows near me and best places to buy impact windows in South Florida.
Common mistakes to avoid
- Buying on price per window alone. Compare what is included: installation, permit coordination, removal of old units, stucco and trim work, and warranty terms.
- Skipping the approval check. Confirm the NOA or FPA covers the exact size and configuration.
- Guessing measurements. A wrong size on a custom order is expensive and slow to fix.
- Forgetting the HOA or condo board. Approval can take longer than the install itself.
- Not filing the wind mitigation report. The discount does not apply itself; send the inspection to your insurer.
- Treating the permit as optional. An unpermitted replacement can create problems with insurance and at resale.
- Waiting until a storm is on the map. Demand and lead times tend to rise before peak season.
- Ignoring maintenance. See maintenance, how long impact windows last, cracked glass, foggy windows and repairs. Also see replacement impact glass and sliding door glass replacement.
Beyond storms: energy, noise and everyday benefits
Impact glass also insulates and quiets a home. Laminated glass reduces outside noise, and the interlayer filters ultraviolet light that fades floors and furniture. Efficiency depends on the glass coating and frame, so compare options in energy efficiency and energy savings, and read noise reduction. Results vary with the home and your utility rates, so treat any figure as an estimate.
Local guides by county and city
Local building departments, HOAs and housing stock differ. Start with your county hub: Broward, Miami-Dade or Palm Beach County, then see the city pages under "Where We Serve" below or browse every area on the service areas page. Looking to sell inventory instead? See how to list on the marketplace.