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ECO Window Systems Home Additions & ADU: The Jacksonville Owner’s Guide
If you’re planning a home addition or ADU in Jacksonville and want ECO Window Systems windows in the new space, the installed cost typically runs $45,000 – $130,000 for the full addition, with the window package itself representing a meaningful slice of that budget. We handle the framing, the opening prep, and the careful installation of your ECO Window Systems units so the new space performs the way the manufacturer intended. Most Jacksonville owners reach this page because they’re sitting on an estimate for an addition and want to know whether ECO Window Systems windows will work with the project, or they have existing ECO windows and worry about matching them when the new walls go up. Here’s what the everyday practical side of that looks like, written by someone who has done this work in Avondale, San Marco, Riverside, and across Jacksonville for years.
Written by Graham Stein, Owner, Elmstead Remodeling Jacksonville at Elmstead Remodeling Jacksonville, serving Jacksonville and nearby areas.
Which ECO Window Systems Models This Applies To
ECO Window Systems builds windows in a range of frame materials and glass packages. The most common units we work with on Jacksonville additions and ADUs are their vinyl and aluminum lines, which come in widths that start around 24 inches and run up to 72 inches for fixed picture windows. The critical compatibility check is the frame depth. ECO’s standard residential units are built for a 2×4 or 2×6 wall, and the frame depth determines whether your new addition’s rough opening needs furring strips or a custom jamb extension. We measure every existing window before we order anything, because two ECO units of the same glass size can have different frame depths depending on the series.
There’s a real decision here that Jacksonville humidity pushes on. Some owners ask whether an aftermarket equivalent can fill the gap. For new construction on an addition, the answer depends on whether you’re matching existing ECO windows. If the new room shares a wall with the old house and the windows will sit side by side, we strongly recommend staying with genuine ECO Window Systems products. The frame profile, the corner welds, and the glass tint differ slightly between brands, and in a room with strong Florida light, that difference shows. If the addition is fully separate, a quality aftermarket window from a brand you can research by name works fine, and we’ll quote it honestly either way.
We’re an independent Jacksonville remodeling contractor. We’re not affiliated with ECO Window Systems, but we install their products regularly and can source them through local Jacksonville suppliers without the markup you’d see from a middleman.
Styles & brands we work with
Signs Your ECO Window Systems Home Additions & ADU Is Failing
Most of the time, owners don’t discover a window problem until the addition is already framed and the drywall is in. Here’s what we see on Jacksonville job sites, and what each one actually means.
- Condensation between the glass panes. This means the seal on the insulated glass unit has failed. In Jacksonville’s humidity, a failed seal shows up fast, usually within a few years if the unit was installed with a broken or stressed edge seal. The fix is a new sash or a new glass package, not a full window replacement.
- Stiff or binding operation on a double-hung or slider. Jacksonville’s summer heat causes frame expansion, and if the rough opening was even slightly undersized, the frame bows and the sash binds. We see this most often on west-facing walls in Riverside and Avondale where afternoon sun beats on the window for hours.
- Water staining on the interior drywall below the window. This is almost always a flashing or installation problem, not a window defect. On additions, the junction between the new wall and the old house is the weakest point, and window openings near that junction are where Jacksonville rain finds a way in.
- Draft you can feel around the frame on a cold January morning. Jacksonville gets maybe twenty genuinely cold days a year, but on those days, a poorly sealed window frame is obvious. The cause is usually missing or compressed backer rod and caulk, which is a cheap fix if caught early.
- Windows installed in a new addition that don’t match the existing house’s ECO units. This is a planning failure, not a product failure. The new windows may be a different series with a slimmer frame profile, and it reads as a visual mismatch from the street. We catch this on the front end with a measurement and a written product list.
See the difference
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AfterReplacement Cost & What’s Included
For an ECO Window Systems home addition or ADU in Jacksonville, plan on $45,000 – $130,000 for the complete project, including framing, roofing, electrical rough-in, drywall, flooring, and the window package. The window portion alone typically accounts for $4,500 – $15,000 depending on how many openings you have and which series you select. Here’s the breakdown we give every Jacksonville homeowner before any work starts.
| Line Item | Typical Jacksonville Range |
|---|---|
| Full home addition (framing through finish) | $45,000 – $130,000 |
| ADU construction (detached, complete) | $90,000 – $220,000 |
| Garage conversion (finished space) | $30,000 – $80,000 |
| Window replacement within addition | $4,500 – $15,000 |
| ECO window sash or glass package replacement | $400 – $1,200 per unit |
Every number is a written price before we start. Not an estimate that grows after the crew arrives. The written price names the materials by brand, breaks labor into stages, and has no allowance line items. If the scope changes because we open a wall and find something unexpected, you get a new written price for the change before we touch that part of the work. The 365-Day Done Right Promise applies to the finished project: if it’s not done right, we make it right.
DIY or Call Us?
If you have an existing ECO window with condensation between the panes, there’s nothing you can safely repair yourself. The sealed glass unit is factory-made, and swapping it requires removing the sash, which on taller units is a two-person job with a real risk of dropping and shattering tempered glass. We’d rather you call us at (904) 643-6243 before attempting it. If the question is whether ECO windows will work in your planned addition, that’s a conversation we can have over the phone. Graham Stein has spent close to two decades on residential projects, and the measuring and product-selection stage is where he catches the mistakes that cost money later. Name the material, name the day, name the price – then there is nothing left to wonder about.
FAQs
In Jacksonville’s heat and humidity, ECO Window Systems vinyl and aluminum units typically hold up for 15 to 25 years before the glass seals start failing or the hardware wears out. Coastal salt air near the beaches shortens that range on the aluminum line if the finish isn’t maintained. Call (904) 643-6243 for an honest assessment of your specific windows.
Yes, in most cases a failed insulated glass unit can be replaced without tearing out the whole window. The sash comes out, the new glass package goes in, and the window is reinstalled. This runs $400 – $1,200 per unit in Jacksonville depending on size and glass coating. Call (904) 643-6243 for a written price.
A straightforward single-room addition in Jacksonville typically takes 3 to 6 months from permit to final walk-through. An ADU runs 5 to 9 months. Weather, permitting, and the window lead time all factor in, and we put the schedule in writing before we start. Call (904) 643-6243 to talk through your project timeline.
We stock common ECO sash locks, tilt latches, and weatherstripping on our trucks for same-day fixes. Full sash replacements and insulated glass units are ordered through Jacksonville suppliers and typically arrive within 1 to 2 weeks. Call (904) 643-6243 and we’ll tell you what we have before you schedule anything.
If you’re planning a home addition or ADU with ECO Window Systems windows, or you have a failed ECO window that needs attention, call us at (904) 643-6243 for a free estimate. We answer the phone with a live person, every time. We’ll come out, measure, and hand you a written price you can read without calling to ask what anything means.
Written by Graham Stein, Owner, Elmstead Remodeling Jacksonville at Elmstead Remodeling Jacksonville, serving Jacksonville and nearby areas.
