Window Replacement in Marathon - Free In-Home Measure, Written Price

Fast, Reliable Window Replacement Across Marathon

Window replacement in Marathon runs $950-$2,800 per opening for most homes, with full-frame impact-rated units on the upper end. If you’re calling from Coco Plum, Sombrero Beach, or Key Colony Beach, our crews know the roads, the setbacks, and the salt. Call (954) 280-4413 and a live person picks up, day or night.

Call (954) 280-4413

We are TruePane Windows & Doors. We have been installing, replacing, and standing behind windows since 2008, and we treat every Marathon home like it sits on the water, because it does. The Atlantic on one side, the Gulf on the other, and 180+ mph design wind speeds in between. That combination changes everything about how a window gets specified, set, and flashed.

Why TruePane Windows & Doors Is Marathon’s Preferred Window Replacement Company

Marathon homeowners do not call around for quotes. They call the company their neighbor used, and they ask hard questions about warranty registration before the truck leaves the driveway. We answer those questions in writing. Every TruePane job is covered by The Keystone Standard, which means both manufacturer warranty layers get registered in writing with durations stated, before we leave. And our Done Right Promise backs the workmanship itself. If it is not done right, we make it right. No paperwork fight, no fine print.

Dale Kessler founded this company in 2008 on a simple rule that still sits on the whiteboard: if the pane is not true, the job is not done. That applies to a double-hung on Sombrero Beach Road and a casement on Grassy Key. Our technicians are background-checked and uniformed. They measure every opening twice, quote manufacturer lines side by side on paper, and do not leave a second appointment hanging. A live person answers the phone 24/7. Not a voicemail tree.

We have worked on enough post-Irma rebuilds and FEMA-elevation retrofits in Marathon to know that the rough opening in a 1970s piling home is rarely square, rarely standard, and rarely forgiving. That experience is why local contractors refer us, and why Marathon homeowners who have been burned once do not shop the low bid twice.

Our Window Replacement Services in Marathon

Full Frame Replacement

Full frame replacement in Marathon typically runs $1,800-$2,800 per opening. We remove the old jamb, sill, and trim down to the rough opening, inspect the framing, and rebuild the waterproofing layer from the sheathing out. On post-Irma rebuilds, rough openings were often altered during elevation or repair, which means shims, marine-grade flashing tape, and re-squaring are not optional. They are the difference between a window that sheds salt spray and one that rots from the inside.

Insert Window Replacement

Insert replacement in Marathon typically runs $950-$1,600 per opening when the existing frame is structurally sound. We set a new unit inside the old jamb, insulate the perimeter, and cap the exterior. The catch in Marathon’s salt air is that the existing frame is often farther gone than it looks from the street. We always check for hidden sill rot and corroded jambs before recommending an insert, because a new window in a failing frame will not hold a warranty, ours or the manufacturer’s.

Storm Window Replacement

Storm window replacement in Marathon typically runs $600-$1,200 per unit for secondary glazing, though most Marathon homeowners end up replacing the primary window instead. Here is why: secondary glazing does not satisfy Monroe County impact requirements. If you are replacing storm windows on a home that still has original jalousie or single-pane openings, you are likely carrying a code liability that a permit will expose. We will tell you straight what the inspector will flag, before you spend a dime.

Energy-Efficient Upgrade

Energy-efficient upgrades in Marathon are less about heating and more about humidity control and UV load. Low-E coatings on impact-rated IGUs cut solar gain enough to matter on an elevated CBS home in July, and the right spacer system slows seal failure in an environment that runs 80%+ relative humidity year-round. A typical energy-efficient replacement runs $1,200-$2,200 per opening depending on glass package, and the upgrade cost over standard impact glass is usually modest.

Impact-Rated Window Replacement

Impact-rated replacement in Marathon is not an upsell. It is the baseline. Monroe County sits in a 180+ mph design-wind-speed zone, and any permitted structure must carry impact-rated windows and doors. We are an authorized installer for PGT, CGI, CWS, and more than a dozen other manufacturer lines. If you are pulling a permit and the inspector flags jalousies, we can get the right rated units on order that week.

What a Marathon Permit Actually Triggers

This is the part nobody explains until the inspector is standing in the driveway. In Marathon, Monroe County code treats any permitted remodel as a trigger to flag and mandate replacement of every non-impact jalousie window on the structure. You planned to renovate a bathroom. The inspector’s report now lists eleven louvered openings that must be converted to impact-rated glazing before the wall can be closed.

That compliance cascade does not exist in mainland Florida cities like Miami or Tampa. It is specific to the Keys, and it is the single biggest reason a Marathon remodel quote moves. We handle it inspection-first. Before we write a contract, we walk the permitted scope, count every jalousie and single-pane opening, and build the replacement allowance into the line items. If the inspector flags something we did not anticipate, any surprise gets priced and approved in writing before we touch it.

On Coco Plum Drive, our crew pulled a permit to replace two failed jalousie units on a 1970s piling home and the Monroe County inspector flagged all eleven remaining louvered openings for impact-rated glazing before we could close the wall. We wrote the full-frame casement upgrade into the contract allowance that same afternoon, removed the corroded aluminum jambs, and flashed every rough opening with marine-grade tape before the new double-hung units went in. The homeowner knew the number before the first pane came out. That is how it should work.

Trusted Brands We Service in Marathon

We install and service PGT, CGI, CWS, Ply Gem, and more than a dozen other manufacturer lines, and we are an authorized installer for each one. That means warranty registration actually happens, in writing, with durations stated, before our truck leaves your driveway. We also stock common replacement hardware and balances for the units already in Marathon homes, which cuts lead time when you need a sash roller or a balance cartridge before a storm rolls through.

Common Window Replacement Problems We See in Marathon Homes

• Salt-corroded aluminum frames and sill pans. Flanked by the Atlantic and the Gulf, Marathon structures receive salt spray from multiple directions year-round. Non-marine finishes pit within a few seasons, jambs lose their seal, and air leaks show up. Marine-grade hardware and stainless fasteners are not optional here; they are what keeps a warranty alive.
• Fogged panes and failed seals from persistent humidity. Marathon’s 80%+ relative humidity accelerates seal failure in non-impact insulated glass. Once the argon fill leaks out, the glass fogs between the panes and there is no repair, only replacement. We see this constantly on second floors of elevated homes where the glass catches full sun and salt spray on the same face.
• Post-Irma rough openings that are no longer square. After Hurricane Irma’s Category 4 direct strike in 2017, a large share of Marathon’s housing stock was rebuilt or elevated, and the rough openings were altered in the process. When a new window goes into a skewed frame without proper shimming and flashing, water intrusion follows and impact warranties get voided. We re-square and re-flash every opening we touch.
• Jalousie windows flagged on permit. Older Marathon homes, especially those built between the 1950s and 1980s, still carry original jalousie or louvered awning windows. They are entirely non-compliant with current Monroe County impact requirements, and the moment you pull a permit for any renovation, the inspector flags every one of them. We handle the replacement scope before it becomes a change order surprise.

Pricing for Window Replacement in Marathon, FL

We Also Serve Cities Near Marathon

Our crews work up and down the Keys, from Marathon to Key Colony Beach, Big Pine Key, Tavernier, and Key Largo. Dispatch and scheduling are coordinated from our Miami office, but the technicians who show up know the Keys. If you are in a neighboring city and need the same inspection-first approach to Window Replacement, call us and we will get you on the schedule.

FAQs - Window Replacement in Marathon