Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
Before
After
Before
After
Before
AfterFast, Reliable Impact Windows Across Key Biscayne
Impact window installation in Key Biscayne typically runs $800 to $1,500 per opening for standard units, with whole-home packages starting around $8,000 and large custom openings reaching $5,000 or more. What makes Key Biscayne different from every other Miami-Dade market is the salt. This is a true barrier island, surrounded by open saltwater on all sides, which means the hardware and frame materials we specify here are not optional upgrades. They are the difference between windows that last fifteen years and windows that start corroding at the jamb in five. Call (904) 478-8983 for a free in-home measure and a written line-item quote.
Our Impact Windows team has worked on condos along Crandon Boulevard, single-family homes in the interior, and waterfront properties facing both the Atlantic and Biscayne Bay. We know what fails here, what holds up, and what the county inspector is going to look for before the permit is even pulled.
Why Winslow Windows & Doors Is Key Biscayne’s Preferred Impact Windows Company
Ed Winslow founded this company in 2011, and his name is still on the door. That is not a slogan. It means when a Key Biscayne homeowner calls about a seized sash lock or a failed seal on a three-year-old unit, the person accountable is the same person who signed off on the original install. We do not hide behind ticket numbers or call centers. A live person answers the phone at (904) 478-8983, 24 hours a day, every day of the year.
Key Biscayne customers have repeatedly cited our crew’s familiarity with condominium board requirements along Crandon Boulevard and the waterfront. Building departments and condo associations here ask for documentation that mainland contractors sometimes fumble: Miami-Dade Product Control Notice of Acceptance (NOA) numbers for every configuration, design pressure calculations matched to the specific opening, and proof that the installer is authorized for the brand being installed. We keep those records on file and provide them up front. Every technician who arrives on the island is background-checked and in uniform, so the person at your door is exactly who the office said it would be.
The Done Right Promise applies to every window we install on Key Biscayne. If it is not done right, Ed makes it right. No expiration date, no fine print, no transfer to a warranty department that stopped answering. That promise is a hundred years long, which is roughly how confident we are in the marine-grade specifications we use here.
Our Impact Windows Services in Key Biscayne
Impact-Rated Glazing with Laminated Glass Interlayer
The laminated glass interlayer is the actual protection in an impact window. When debris hits the outer pane, the interlayer holds the glass in place so the wind envelope of the structure stays sealed. On Key Biscayne, the interlayer itself is not the weak point. The weak point on cheaper units is everything around the glass: the aluminum frame that pits in salt air, the hinges that seize, the weep covers that corrode and clog. We specify units where the frame rating matches the glazing rating, because a Large Missile Impact rating on glass inside a fast-corroding frame is not protection. It is a countdown.
Miami-Dade NOA Certified Replacement Windows
Every replacement window on Key Biscayne must carry a Miami-Dade Product Control Notice of Acceptance for the exact size, configuration, and design pressure of the opening where it is installed. Not a similar window from the same brand. The exact window. Condo boards on Crandon Boulevard are increasingly strict about this, and insurers are catching up. We pull the NOA documentation for every unit before ordering, and we include the numbers on the written quote. No substitutions, no “comparable product,” no surprises when the inspector asks.
Marine-Grade Frame and Hardware Upgrades
On a 1970s condo along Crandon Boulevard, we replaced original corroded jalousie windows with impact-rated double-hung units carrying Miami-Dade NOA. The aluminum frames on the old units had pitted and seized at the sash locks from decades of salt air. So our crew specified stainless steel hardware and marine-grade finishes on the new install. Standard fasteners on this island rust out within a few years. A window can be rated for a Category 5 debris impact, but if the hinge screw corrodes through at year six, the rating no longer exists in any real-world sense. This is the detail that separates a Key Biscayne-spec install from a mainland-spec install, and it is the first thing we check when we evaluate an existing window that is failing early.
Full Opening Replacement and Retrofit
Older Key Biscayne buildings, especially the 1960s through 1980s condominium stock, present two retrofit challenges. First, the original openings are frequently non-standard sizes, which means the new impact units are custom-fabricated rather than pulled from stock. Custom fabrication runs four to six weeks, and the price reflects it. Second, the original framing around the window is often as corroded as the window itself. We inspect the rough opening and the buck framing before ordering, because installing a marine-grade window into a frame that is already failing just moves the failure point. On Key Biscayne, a proper replacement frequently includes new pressure-treated or masonry-anchored buck framing, which is part of what the written quote should show you.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Key Biscayne
Winslow Windows & Doors is an authorized installer for PGT, CGI, CWS, ES Windows, ECO Window Systems, Mr-Glass, Therma-Tru. On Key Biscayne, we most frequently specify CWS and ES Windows for waterfront condominium work, because their marine-grade frame treatments and stainless hardware packages hold up longer in continuous salt spray. Mr-Glass is a strong option for custom geometric openings in older units where standard rectangles do not fit. Because we install these brands regularly across the island, our supplier relationships mean faster turnaround on replacement sashes and hardware. We do not install or service anything outside this lineup, and we will tell you plainly if a specific style you want is not available from one of these manufacturers.
Common Impact Windows Problems We See in Key Biscayne Homes
- Salt-corroded frame hardware on otherwise intact windows. The glass and interlayer are fine, but the hinge, lock, or weep cover has pitted and seized. We see this on units as young as five or six years, especially on east-facing elevations with direct Atlantic exposure. The fix is often a hardware replacement with stainless or marine-grade components, not a full window replacement.
- Failed seals from thermal stress and salt intrusion. The constant temperature swing between air-conditioned interiors and full sun on a barrier island stresses the sealant at the glass edge. Salt accelerates the degradation. Fogged glass on an impact-rated unit means the desiccant in the spacer has failed and the unit has lost its insulating performance even if the impact rating remains.
- Jalousie windows still in service. Older condo units and guest cottages on the island still have louvered jalousie windows, which are not just outdated. They are out of compliance with Miami-Dade HVHZ code and are increasingly uninsurable. Insurers have ramped up non-renewal notices after Hurricane Irma’s direct hit in 2017, and virtually every older unit still carrying jalousies will eventually face a replacement demand.
- Improperly specified non-marine-grade hardware on recent installs. We have seen impact windows installed within the last decade whose hardware was clearly spec’d for inland use. The jamb hardware corrodes, the unit loses its design pressure integrity, and the homeowner has no idea until a storm is approaching and the window will not properly seal or lock. This is the single most expensive correction we perform, because it often means replacing the entire unit, not just the hardware.
Pricing for Impact Windows in Key Biscayne, FL
In Key Biscayne, a standard impact-rated window runs $800 to $1,500 per opening installed. Single-hung units fall between $900 and $1,800. Large custom openings, including floor-to-ceiling oceanfront glazing and geometric shapes, run $2,500 to $5,000 per opening. Whole-home packages for a typical Key Biscayne condo or single-family home start around $8,000 and climb past $25,000 depending on opening count, configuration, and flooring height. What moves the price here more than anywhere else in Miami-Dade is the marine-grade specification. Stainless steel hardware, sealed frame finishes, and custom NOA-matched fabrication add real cost. The mainland quote that comes in 20% cheaper is almost always the inland-spec version of the same job, and on this island, that spec starts failing before the check clears. Call (904) 478-8983 for a free in-home measure and a written quote that shows every line item.
What Impact Windows Costs in Key Biscayne
The numbers above are the honest range for this island. A standard impact window, opening included, runs $800 to $1,500 installed. Single-hung impact units fall between $900 and $1,800. Large or custom openings, which are common in the 1960s through 1980s condo stock along Crandon Boulevard and the waterfront, run $2,500 to $5,000 per opening. Whole-home packages start around $8,000 and reach $25,000 or more when you are looking at full floor-to-ceiling oceanfront glazing or extensive geometric openings. The three biggest price drivers on Key Biscayne are opening count, wind zone requirements at your specific floor height, and the frame material and hardware specification. A marine-grade aluminum frame with stainless hardware costs more than a standard aluminum frame, and on this island, it is the only defensible choice. Wood-framed impact units carry their own price premium and are rare on the waterfront. We provide a free in-home measure and a written quote before any work begins, so the number you approve is the number you pay. No change orders, no upcharges, no surprises.
Florida Pays You Back
Florida has put real money behind impact window replacement, and Key Biscayne homeowners qualify on multiple fronts. The My Safe Florida Home program offers matching grants up to $10,000 for qualifying wind-mitigation upgrades, including Miami-Dade NOA impact windows. Florida also exempts impact-resistant windows and doors from sales tax. At the federal level, the 25C energy credit returns 30% of the product cost on qualifying units, up to $600 per year. Beyond the direct incentives, most windstorm carriers apply a premium credit after a wind-mitigation inspection, which typically costs $75 to $150 and averages around 25% on the windstorm portion of the policy. Every program, carrier, and inspection has its own rules, and none of this is guaranteed. What we can tell you is that a proper NOA-documented impact window installation is the single largest wind-mitigation credit most Key Biscayne homeowners will ever claim. We provide the documentation your insurer asks for, including NOA numbers and design pressure calculations.
One more point worth making, plainly. Impact windows versus hurricane shutters. Shutters do one thing: they cover an opening when a storm is coming. That means someone has to be home, or someone has to be paid, every time a warning goes up. Impact windows protect continuously. There is no panel to hang, no track to maintain, no corrosion at the shutter mechanism, which on Key Biscayne is a real problem for metal shutter systems. You pay more up front for impact windows and you never think about them again. On a barrier island where evacuation orders come with hours of notice, that permanence is worth the price.
We Also Serve Cities Near Key Biscayne
From our base serving Impact Windows in Key Biscayne, our crews also cover Miami Beach, Miami, and Coral Gables. Dispatch and scheduling are coordinated from our Miami, South FL office, with local crews serving Key Biscayne directly. The same marine-grade specifications and NOA documentation apply everywhere we work, but the salt-spray environment here is the reason we spec this island differently than any of the surrounding cities. If you are in Key Biscayne or anywhere nearby, the free estimate and the written quote work the same way.
Serving Key Biscayne, FL - Our Local Coverage Area
We’re based in the Key Biscayne area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Impact Windows in Key Biscayne
Because Key Biscayne is a true barrier island with open saltwater on both sides, the airborne salt concentration is dramatically higher than even beachfront properties on the mainland. Standard aluminum frames, zinc-plated hinges, and basic stainless fasteners pit and corrode years ahead of the same hardware installed in Coral Gables or inland Miami. Marine-grade finishes on the frame and stainless steel hardware at every moving part are what prevent a five-year-old impact window from seizing at the lock. On this island, that spec is not an upgrade. It is the minimum.
No. Jalousie and louvered windows do not meet Miami-Dade High Velocity Hurricane Zone large-missile impact requirements and are not compliant for new installation or as replacement glazing. Many older condo units and guest cottages on the island still have them. Local insurers have been issuing non-renewal notices for units with jalousies since Hurricane Irma’s 2017 direct hit on Key Biscayne. The practical answer is that every jalousie on this island will eventually have to come out, and replacing them with NOA-rated impact units is the single largest insurance-risk reduction most older Key Biscayne buildings can make.
Directly, it does not. The interlayer is sealed inside the glass unit, and salt does not touch it. What salt air destroys is the frame, the edge seal, and the hardware that keep the interlayer doing its job. When the frame pitts and the seal at the glass edge fails, moisture enters the air space and the unit fogs or loses its insulating gas fill. When the hardware corrodes, the sash no longer seats properly against the frame, and the window loses its design pressure rating. The interlayer is still there, but the window no longer protects the opening as a complete system. On Key Biscayne, we have seen this chain start in under a decade on units with standard interior hardware specifications.
It can, and it usually does for properties that have not had a full impact-rated retrofit. Most windstorm carriers apply a premium credit after a wind-mitigation inspection documents the NOA-rated openings. The inspection typically costs $75 to $150. The credit on the windstorm portion of the premium commonly averages around 25%, though the exact number is set by your carrier and your policy. We provide the NOA documentation and design pressure calculations your insurer requests, so the inspection usually goes through without back-and-forth. Call (904) 478-8983 and we will walk you through exactly what your agent will ask for.
The difference is almost always the specification behind the number. A mainland contractor quoting the same window model without marine-grade hardware, without stainless fasteners, and without sealed frame treatments can price the job 15 to 20 percent lower. That inland-spec window will fail on Key Biscayne within a decade, usually at the hardware and frame joints, and the correction often means a full replacement rather than a repair. The higher Key Biscayne quote is not padding. It is the cost of specifying the unit for continuous salt spray and HVHZ design pressure at the same time. Any written quote should show the hardware and frame spec line by line. Ours does.
For an exact quote on your Key Biscayne impact windows, call (904) 478-8983. The estimate is free, and it includes a written line-item breakdown with the NOA documentation for every unit we propose. Ed Winslow’s name is on the door, and on every job we do on this island.
Written by Ed Winslow, Owner at Winslow Windows & Doors, serving Key Biscayne and South Florida since 2011.
Six Reasons Homeowners Choose Winslow Windows & Doors
Impact systems engineered to design pressures up to +/-100, matched to your wind zone - your openings hold when the storm arrives.
Low-E insulated impact glass from our manufacturer lines commonly cuts monthly cooling bills 20-30%.
Laminated impact glass shuts out up to 40% of outside noise - traffic, neighbors, weather.
Monitoring services run $30-90 a month. Laminated impact glass resists forced entry around the clock, with no subscription.
Florida homeowners average around 25% savings on the windstorm portion of their policy after protecting every opening - some homes qualify for more.
A full impact package upgrades curb appeal, buyer confidence and appraised value in one project.