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AfterFast, Reliable Sliding & Patio Doors Across Marathon
Sliding and patio door replacement in Marathon, FL runs between $2,800 and $9,500 for most homes, with heavy-duty impact-rated systems starting around $5,000 installed. The price depends on the opening size, the Miami-Dade NOA rating on the product, and how much concrete cutting your 1950s or 60s block home needs to accept the new frame. TruePane Windows & Doors has been putting compliant sliders into Marathon homes long enough to know exactly what Monroe County inspectors look for and exactly what the salt air does to cheap hardware. Call (754) 238-2201 and we’ll give you a written line-item quote with the NOA paperwork registered before the truck leaves your driveway.
Why TruePane Windows & Doors Is Marathon’s Preferred Sliding & Patio Doors Company
Marathon sits inside Florida’s High Velocity Hurricane Zone. That is not a marketing phrase. It is a building code designation with teeth, and it means a sliding door that passes inspection in Miami or Naples might get red-tagged here if it lacks the right Miami-Dade Notice of Acceptance. We have walked enough Marathon homeowners through failed inspections from mainland contractors to know the difference between a door that looks impact-rated and a door that is actually legal on Key Vaca. Our work in Marathon includes replacements in the older CBS neighborhoods south of US-1, the elevated rebuilds that went up after Irma, and the canal-front homes off Sombrero Beach Road where the wind loads and salt exposure are as bad as it gets.
We are not the cheapest bid you will get in Marathon. We are the call you make after the cheap bid fails inspection or the rollers seize up three years in. Dale Kessler founded TruePane in 2008 on a simple rule that still governs every job we take: if the pane is not true, the job is not done. Our Sliding & Patio Doors crews are background-checked, uniformed, and trained to measure every Marathon opening twice before we ever quote a product line. We register both manufacturer warranty layers in writing before we leave your driveway, and the Done Right Promise covers our workmanship with no fine print and no arguing. A live person answers the phone 24 hours a day, 7 days a week. Not a voicemail tree. Not a callback form. A person.
Our Sliding & Patio Doors Services in Marathon
Every home in Marathon deals with the same three forces: salt, wind, and code enforcement. The services below are the ones we do most often here, and each one starts with the same question: what does Monroe County require on this opening, and what will the inspector ask for during close-out.
Patio Sliding Doors
A patio slider in Marathon has to do more than open and close. It has to hold its seal in a Cat 4 wind event and keep the salt from eating the track in under five years. We size patio sliders to the existing slab condition and the exposure direction, because a door on the Atlantic side of Key Vaca takes a different beating than one facing Florida Bay. Most patio slider replacements in Marathon run $2,800 to $6,500 depending on width and glass package.
Heavy-Duty Sliding Doors
For large openings, canal-front walls, or elevated post-Irma rebuilds, a standard patio slider is not enough. Heavy-duty sliding doors in Marathon typically run $5,500 to $9,500 installed, and the product has to carry an HVHZ NOA specifically for the size you are installing. These are the doors we anchor with stainless steel fasteners and flashing tape rated for the wind zone, because the inspector will check, and your insurer will ask for the paperwork later.
Pocket & Barn Doors
Pocket sliders are popular in Marathon’s older CBS homes because they preserve floor space in rooms that were framed tight in the 1950s and 60s. But a pocket door in an exterior wall on Key Vaca is a different animal than an interior barn door on a mainland house. The pocket cavity has to be sealed against driven rain, the track hardware has to be marine-grade, and the rough opening work usually involves cutting into concrete block. We do it right the first time, which is why our Marathon customers call us back when the next opening needs work.
Screen Door Installation
Marathon’s heat and bugs make a screen door a working appliance, not an accessory. We install screen doors sized to the new slider frames, and we use hardware that does not corrode into a stuck lump after two summers of salt air. It is a smaller job, but it is one we get calls about all year.
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 Marathon
We are an authorized installer for more than a dozen manufacturer lines, and for Marathon work we lean on the ones with proven HVHZ track records: PGT, CGI, and ES Windows are the names we quote most often on Key Vaca because their NOA documentation is clean and their hardware holds up to the salt. We put side-by-side quotes on paper so you see exactly what you are buying, and we keep common replacement parts stocked for Marathon service calls, which means less waiting when a roller fails or a lock stops catching. A mainland contractor might quote you a door that says “impact rated” on the brochure but has no Miami-Dade NOA. We will not sell you that door, because Monroe County will not pass it, and you will be the one stuck holding the invoice.
Common Sliding & Patio Doors Problems We See in Marathon Homes
- Salt-corroded tracks and rollers. Marathon’s 360-degree salt air eats standard aluminum slider hardware in three to five years. Doors start binding, jumping the track, or refusing to lock, and by the time you notice, the frame fasteners may be compromised too. We replace the hardware with marine-grade stainless and set the track for another decade.
- Undersized rough openings from jalousie conversions. Those original louvered jalousie openings on 1950s and 60s CBS homes are almost never the right size for a modern impact slider. The opening has to be cut wider through the concrete block and properly reinforced, or you get cracks, leaks, and a failed inspection.
- Doors with mainland impact ratings but no Miami-Dade NOA. This is the most expensive mistake we see in Marathon. A door can say “impact rated” and still be illegal here because it lacks an NOA for High Velocity Hurricane Zone use. Monroe County flags it at inspection, and your insurer can refuse to cover the opening. We only install products with the paperwork to back the label.
- Fogged glass and failed seals on ocean-facing elevations. The constant humidity and heat cycling on Marathon’s south-facing walls stresses insulated glass units faster than on the mainland. A slider that faces the Atlantic can show seal failure in as little as five to seven years if the unit was not built for this climate.
Pricing for Sliding & Patio Doors in Marathon, FL
Here is what we quote most often on Marathon jobs. A standard two-panel patio slider with HVHZ impact glass runs $2,800 to $4,800. Heavy-duty sliders for large or elevated openings run $5,500 to $9,500. Pocket door conversions that require concrete cutting add $800 to $2,200 to the base door price depending on how much block work the opening needs. Screen door installation is $400 to $1,100. The single biggest cost driver in Marathon is the rough opening: if you are pulling an original jalousie and the block has to be cut, you are paying for labor and disposal on top of the door itself. The second driver is the NOA documentation. Every compliant quote includes the stamped Miami-Dade NOA, the permit, and the close-out paperwork. A cheap quote that omits those is not cheaper. It is incomplete. Call (754) 238-2201 for a free written estimate on your specific opening. We measure, we quote, and the number on the paper is the number you pay.
We Also Serve Cities Near Marathon
TruePane handles Sliding & Patio Doors in Marathon and the surrounding Keys, including Key Colony Beach, Big Pine Key, Tavernier, and Key Largo. The same HVHZ code applies up and down the island chain, and we bring the same NOA documentation and marine-grade hardware to every job. If you are within an hour of Marathon, we will be there.
Serving Marathon, FL - Our Local Coverage Area
We’re based in the Marathon 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 - Sliding & Patio Doors in Marathon
Yes. Marathon sits in the High Velocity Hurricane Zone, and Monroe County requires a Miami-Dade Notice of Acceptance on every exterior door and window opening. “Impact-rated” without an NOA is not legal here, regardless of what the product label says. Call (754) 238-2201 and we will confirm whether your opening already has compliant paperwork before you spend anything.
Those original jalousie window walls were built to a much slimmer frame profile than a modern HVHZ-rated slider, so the opening is almost always several inches too narrow. The fix is cutting into the concrete block and reinforcing the new opening, which is routine work here in Marathon but is a job mainland installers often do wrong. We do the block work, the anchoring, and the permit close-out in one scope.
Your insurer may require proof that every exterior opening meets current wind-load code before they renew or pay a windstorm claim. When we finish a Marathon job, you get the stamped NOA, the permit, and the inspection close-out in writing. That paperwork is what allows you to keep your windstorm policy intact, and it is what a cheap mainland install leaves you without.
Marine-grade stainless steel fasteners, rollers, and track hardware. Standard aluminum hardware corrodes in three to five years here because the salt air comes from the Atlantic on one side and Florida Bay on the other, 360 days a year. We specify stainless on every Marathon install and register the hardware warranty in writing so you are not fighting a voided claim later.
In almost every case, no. The old frame was not built to carry the weight of impact-rated laminated glass, and it will not meet the NOA requirements for Marathon unless the frame itself is part of the tested and approved assembly. Retrofitting glass into an unrated frame is a good way to fail inspection and lose insurance coverage. We will tell you honestly whether your frame can be saved, and the answer is usually that the whole assembly needs to be replaced. Call (754) 238-2201 for a straight answer and a written quote.
We work in Marathon because we know Marathon. We know the code, the salt, the wind, and the inspectors. And we stand behind every door we set, in writing, with the paperwork in your hand before we leave. Call (754) 238-2201 to schedule your free estimate. A live person answers. Day or night.
Written by Dale Kessler, Owner at TruePane Windows & Doors, serving Marathon, FL.
Six Reasons Homeowners Choose TruePane 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.