Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
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AfterFast, Reliable Custom & Geometric Windows Across Key Biscayne
Custom and geometric windows in Key Biscayne run about $2,500 to $5,000 per opening for impact-rated units, and most projects take four to six weeks from measure to install because every configuration needs Miami-Dade Product Control Notice of Acceptance (NOA) documentation. That’s the honest answer. On a barrier island where the Atlantic hits one side and Biscayne Bay laps the other, a round or arched window isn’t a style decision you can hand to just anyone. It’s a structural commitment in the strictest wind zone in the country. Our Custom & Geometric Windows team has spent years on the island’s condos and single-family homes, and we know exactly what salt air does to a radius frame five years in. Call Ed Winslow’s crew at (904) 478-8983 for a free in-home measure and a written, line-item quote.
Why Winslow Windows & Doors Is Key Biscayne’s Preferred Custom & Geometric Windows Company
We’re not a faceless national installer. Winslow Windows & Doors has been locally owned and operated since 2011, and Ed Winslow’s name is on the door and on every job we do. Key Biscayne homeowners call us because a live person answers 24/7, not a voicemail loop, and because the technician who shows up is background-checked, uniformed, and has already been introduced to you by name before the truck pulls up. No ticket numbers here. Just a neighbor you can call at 2 a.m. during a hurricane watch and someone will actually answer.
Our reputation on Key Biscayne is built around the jobs other companies walked away from: the 1970s condo on Crandon Boulevard with corroded jalousie frames, the waterfront home in Harbor Point needing a seven-foot arch that had to pass large-missile testing, the Village of Key Biscayne bungalow where the original wood-frame octagon windows had rot at every mullion. We stock marine-grade hardware for fast turnaround, and our Done Right Promise means if it’s not done right, we make it right. That’s a standard of accountability written into every job.
Every estimate is free, every quote is line-item, and we don’t change the price once work starts. Ever. Key Biscayne residents also get the standing offers: $40 off any repair over $200, free second opinions on written estimates, no trip charge inside the home county, and a permanent 10% discount for seniors and veterans. Those aren’t promotions. They’re how we operate.
Our Custom & Geometric Windows Services in Key Biscayne
Custom Impact Windows
Every custom impact window on Key Biscayne must meet Miami-Dade County’s High Velocity Hurricane Zone requirements and carry a Product Control NOA number matched to the exact opening dimensions and design pressure. That includes the big radius transoms over sliders, the trapezoids above doorways, and the tall narrow side-lites framing an entry. We measure each opening, engineer the glass package to the windward elevation, and install units with marine-grade stainless steel hardware. Otherwise, you’re buying a window that passes inspection on paper and fails in salt air within seven years.
Geometric & Shaped Windows
Triangles, pentagons, trapezoids, octagons, half-rounds: the island’s 1960s and 1970s architecture used them everywhere, especially in condo lobbies and waterfront facades along Crandon Boulevard. The problem is that most existing shaped windows were never built for a salt-spray environment. Aluminum frames corrode at the corners first, the sealant pulls away from the glass, and the unit loses its structural integrity long before it looks bad from the curb. We replace them with custom-extruded frames, laminated impact glass, and weep systems that actually shed saltwater instead of trapping it.
Arched & Curved Windows
An arched window on Key Biscayne is a beautiful thing until the hinges seize. We see it constantly. Non-marine-grade locks and hinges on curved units snap under design pressure during a storm, especially on east-facing and southeast-facing elevations that take the full Atlantic load. We specify stainless steel hardware and reinforced radius framing, and we validate the design pressure rating against the actual elevation and floor height. A third-floor arch on the windward side needs a different spec than a ground-floor arch on the leeward side. Most installers never bother to make that distinction.
Oversized Openings
Floor-to-ceiling picture windows and massive geometric glass walls are common on Key Biscayne’s waterfront estates and newer builds. These aren’t standard retail units, and they shouldn’t be treated that way. Oversized openings require engineering scrutiny of the header, the mullion system, and the glass deflection under wind load. We work with ES Windows and ECO Window Systems for configurations that need large-format impact glass with matching sightlines, and we coordinate with the structural realities of an older island structure, not a new suburban lot.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Key Biscayne
Winslow is an authorized installer for CWS, ES Windows, ECO Window Systems, and Mr-Glass, among others, and we service what we install. For Key Biscayne homeowners, that means we stock the marine-grade replacement hardware and sealant systems these brands specify for saltwater environments, so a warranty repair or hardware swap doesn’t take three weeks. Whether it’s a CWS impact arch in a condo on Harbor Drive or an ES Windows geometric unit in a Village home, we know the product line and we know how it performs on a barrier island. You won’t get a blank stare and a six-week parts delay from us.
Common Custom & Geometric Windows Problems We See in Key Biscayne Homes
- Salt-corroded aluminum frames on radius and arch units. Geometric shapes have more corners, more joints, and more sealant lines than rectangles. Salt spray from both the Atlantic and Biscayne Bay works into every seam, and within five to seven years the jamb distorts and the seal fails. This is the single most common failure we replace on the island.
- Seized or snapped hardware on windward-facing curved windows. Hinges and locks that were never spec’d for marine exposure corrode internally, then fail catastrophically under hurricane-pressure loads. East-facing units take the worst beating, and most homeowners never see it coming because the hardware looks fine from inside.
- Clogged weep covers on oversized picture windows. Salt crust builds up faster here than anywhere on the mainland. When weep covers clog, water sits in the sill track and rots the sash from inside. By the time you see the stain, the frame is compromised.
- Jalousie windows that are essentially uninsurable. The old louvered units on 1960s and 1970s condo buildings are out of compliance with Miami-Dade HVHZ code, and insurers have been issuing non-renewal notices since Hurricane Irma’s 2017 direct hit on Key Biscayne. Replacement isn’t optional for most owners; it’s a coverage deadline.
Pricing for Custom & Geometric Windows in Key Biscayne, FL
Here’s what you’re actually looking at in Key Biscayne. Custom impact windows generally run $800 to $1,500 per window installed for standard rectangular openings. Impact single-hung units range from $900 to $1,800. Once you get into geometric shapes, arches, and oversized openings, plan on $2,500 to $5,000 per opening, sometimes more if the configuration requires reinforced framing or a custom mullion package. Whole-home replacements on the island typically land between $8,000 and $25,000-plus depending on opening count and elevation exposure. Floor height matters: a third-floor windward window needs a higher design pressure rating than a ground-floor leeward unit, and that moves the price. Frame material matters too. Aluminum with marine-grade finishes costs more than vinyl up front, but vinyl on a saltwater island is a false economy: it softens, warps, and loses structural capacity years before the aluminum unit would fail. Call (904) 478-8983 for a free in-home measure and a written quote that holds.
What Custom & Geometric Windows Costs in Key Biscayne
The price gap between a coastal-spec and an inland-spec custom geometric window on Key Biscayne is generally 15 to 30 percent, and the difference is all in materials. A radius arch window built to Coral Gables spec uses standard extruded aluminum, off-the-shelf hinges, and a basic weep system. The same arch built to Key Biscayne spec uses marine-grade stainless steel hardware, a sealed frame with corrosion-inhibiting treatment at every joint, and weep covers designed to shed salt spray rather than trap it. The cheap spec fails within five to seven years and gets torn out. The coastal spec is still structurally sound at twenty. We’ve replaced enough inland-spec windows on the island to know exactly which corners got cut. The free in-home measure means you see the real line items before you commit.
Florida Pays You Back
Key Biscayne homeowners have real incentives stacked in their favor right now. The My Safe Florida Home program offers matching grants up to $10,000 for qualifying wind-mitigation upgrades, including impact windows and doors. Florida also exempts impact-resistant windows and doors from sales tax. On the federal side, the 25C energy credit covers 30% of product cost up to $600 per year on qualifying efficient units. And after a wind-mitigation inspection (typically $75 to $150), most insurers apply a windstorm-premium credit averaging around 25% on the windstorm portion of your policy. Every carrier sets its own final number, and program funds are not unlimited, so we tell every Key Biscayne customer the same thing: get the inspection, file the paperwork, and treat these as exactly what they are, a significant but not guaranteed offset.
Local Failure Modes and the Saltwater Tax
On Crandon Boulevard, we replaced a set of original 1970s jalousie in an oceanfront condo with custom arched, Miami-Dade NOA-approved PGT impact windows using marine-grade stainless steel hardware and sealed frames. The old aluminum frames had corroded at every weep cover and hinge. The new units carry large-missile ratings and a laminated glass interlayer that ended the owner’s insurer non-renewal notice. That’s the difference between a window that passes code and a window that survives the island.
Every window and door on Key Biscayne sits inside the High Velocity Hurricane Zone while simultaneously taking salt spray from both the Atlantic and Biscayne Bay. That’s the defining reality of this island. Custom and geometric windows here must meet the strictest large-missile impact standards in the nation while surviving corrosion that mainland beachfront units don’t face. The geometry makes it worse. More corners mean more sealant lines. More joints mean more places for salt to hide. A rectangular window has four corners; an octagon has eight. An arch has a radius hinge that’s a magnet for corrosion. Every design decision compounds.
This is why we specify hot-dip galvanized or stainless steel fasteners on every job, why we use marine-grade finishes on all exposed aluminum, and why we seal every joint the way a boat builder seals a hull. The inland-spec version of the same window costs less up front and costs more within a decade. That’s the saltwater tax. Pay it now or pay it later, with interest.
We Also Serve Cities Near Key Biscayne
Our crews serve the broader South Florida coast, including Miami Beach, Miami, and Coral Gables. The same marine-grade specs and NOA documentation process apply across the region, though the salt-spray exposure on the barrier island is unique. Wherever you are, call (904) 478-8983 for a free estimate.
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 - Custom & Geometric Windows in Key Biscayne
They’re not code-compliant for new installation, which means you can’t legally replace them with new jalousie units under Miami-Dade’s current HVHZ requirements for impact-rated fenestration. In practice, most Key Biscayne condo owners discover this when their insurer issues a non-renewal notice after a hurricane inspection flags the louvered units. The practical answer: they’re functionally uninsurable, and any replacement must meet current large-missile impact standards. Call (904) 478-8983 and we’ll walk you through what your building’s specific situation allows.
Because Coral Gables is on the mainland and Key Biscayne is a barrier island surrounded by open saltwater. The salt-spray environment here corrodes standard aluminum hinges, locks, and weep covers years ahead of mainland schedules, and the wind load exposure on ocean-facing elevations is far higher. A triangle window in Coral Gables can use off-the-shelf hardware. The same triangle on Crandon Boulevard needs marine-grade stainless steel and a higher design pressure rating, not just for the glass but for every moving part. Cheap hardware seizes or snaps under load. Get a free estimate at (904) 478-8983 and ask us to show you the difference on the line item sheet.
Look at the corners first. On geometric shapes, white, chalky corrosion at the joints, especially on ocean-facing units, means the frame is losing structural integrity and a repair won’t hold. Check the weep covers for salt crust; clogged weeps trap water in the sill track and rot the sash from inside. If the hardware feels stiff or makes a grinding sound when you operate it, the internal mechanism is already corroded. On a barrier island with HVHZ wind requirements, a compromised frame is a security risk, not a maintenance item. Call (904) 478-8983 for an honest assessment. We’ll tell you if repair is realistic or if replacement is the only responsible call.
Yes, interior walls that don’t face the exterior are not required to carry impact-rated glazing under Miami-Dade code, so a non-impact arched window between two interior rooms is generally permissible. That said, if the arch is in a wall that separates a conditioned space from an unconditioned one, your condo association may have its own requirements, and you’ll still want a frame that won’t corrode from ambient salt humidity, which penetrates buildings on the island even without direct spray. We’ll check the association rules with you before you order. Call (904) 478-8983 for specifics.
Expect 15 to 30 percent more for the coastal-spec version of the same opening. The difference is in marine-grade stainless steel hardware instead of standard, sealed and treated aluminum frames instead of raw extrusions, and weep systems designed for salt-shedding instead of basic drainage. On a $3,000 arch, that’s roughly $450 to $900 more up front. The inland-spec version on Key Biscayne will likely fail within five to seven years and need full replacement. The coastal-spec version is still structurally sound at twenty. Call (904) 478-8983 and we’ll price both versions on the same line-item sheet so you can see it in writing.
Contact Winslow Windows & Doors
If you live on Key Biscayne and you’re looking at a custom or geometric window project, call (904) 478-8983. Ed Winslow’s name is on the business, and a live person answers every call, day or night. We’ll schedule a free in-home measure, give you a written line-item quote, and spec the job for the saltwater reality of this island, not for a generic Florida suburb. Upfront pricing. No surprises on the invoice. We’re the one down the road.
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.