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ECO Window Systems Home Additions & ADU: The Jacksonville Owner’s Guide
Bradford Remodeling Co Jacksonville installs ECO Window Systems-compatible home additions and ADUs across Jacksonville, with typical project costs running $45,000 to $130,000 depending on square footage, foundation work, and finish level. We’re independent of ECO Window Systems, but we know their window lines well enough to spec them correctly into new construction. Most homeowners reach out after a window or door in their existing ECO setup fails and they realize the whole addition needs rethinking, not just a part swap.
What we see on job sites across Jacksonville, from Riverside to San Marco to Mandarin, is that ECO Window Systems products perform differently in our humidity and salt air than they do in drier climates. The failure usually isn’t the glass. It’s the seal, the hardware, or the rough opening that was never flashed properly in the first place. If you’re planning an addition or ADU and want ECO windows in it, the conversation starts with which series you have now and what’s actually still square.
Which ECO Window Systems Models This Applies To
ECO Window Systems makes several series, and the rough-opening dimensions don’t always match standard framing charts. If you have their single-hung or horizontal roller lines, the frame depth is typically 2-5/8 inches or 3-1/4 inches, which affects how the window sits in a 2×4 versus 2×6 wall. Get that measurement wrong and you’re furring out drywall or rebuilding a buck frame. We measure the existing unit before we write anything.
The identification sticker is usually on the head of the frame or the side jamb behind the sash. You’re looking for a series code and a manufacturing date. ECO’s older impact-rated lines from the mid-2010s used different gasket profiles than their current production, so a replacement sash from one year won’t always seat in a frame from another. We stock common gaskets and hardware on the truck, but full-frame replacements get ordered to spec. For a Jacksonville addition or ADU, you’re not buying a window off the shelf. You’re specifying a unit that has to pass Florida wind-load requirements and our own installation standard.
OEM versus aftermarket matters here. For glass and gaskets, OEM is worth the money on ECO products. For rollers, locks, and weatherstripping, quality aftermarket equivalents from suppliers we’ve vetted hold up as well and cost less. We stock a documented roster of parts alongside the name-brand materials we already work with, including KraftMaid, Cambria, and Silestone for the interior finish work that usually follows.
Styles & brands we work with
Signs Your ECO Window Systems Home Additions & ADU Is Failing
- Condensation between the panes. The seal has failed and the argon or krypton gas fill is gone. This is the most common ECO failure in Jacksonville humidity, and it means the insulated glass unit needs replacement, not just a wipe-down.
- Sash sticks or drops when you release it. The balance system or pivot bar is worn. On ECO horizontal rollers, the roller assemblies flatten over time, especially on larger sliders that get heavy use facing the St. Johns River breeze.
- Water staining under the sill inside the wall. The window may be fine, but the rough opening wasn’t flashed or taped correctly. We see this constantly in additions built before Florida’s 2015 code updates tightened flashing requirements.
- You hear wind whistling around the frame edge when it blows hard. Weatherstripping is compressed or the frame wasn’t shimmed square, so the sash doesn’t seat against the gasket. In a new ADU, this points back to rough carpentry, not the window itself.
- The lock no longer engages or the handle spins free. Hardware stripped or the keep is misaligned from framing movement. This is a five-dollar part attached to a frame problem, and the frame problem is the part you actually need to fix.
See the difference
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After
Before
After
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AfterReplacement Cost & What’s Included
For Jacksonville homeowners, a home addition running $45,000 to $130,000 includes foundation, framing, roofing, electrical and plumbing rough-in, insulation, drywall, trim, paint, and ECO Window Systems windows and doors installed to Florida code. An ADU runs $90,000 to $220,000 because you’re adding a kitchen or kitchenette, a full bath, and often a separate electrical service. Window replacement alone in an existing structure runs $4,500 to $15,000 depending on how many units and whether you’re going impact-rated.
| Scope | Jacksonville Price Range |
|---|---|
| Full home addition (foundation to finish) | $45,000 – $130,000 |
| ADU construction | $90,000 – $220,000 |
| Window replacement (existing structure) | $4,500 – $15,000 |
| Garage conversion | $30,000 – $80,000 |
Every price we give is written down before work starts. That’s not a pitch, it’s how we operate under The Garrison Standard. The number on your written quote is the number you pay. No change orders because we suddenly found a problem we should have caught during the walkthrough. Curtis Lane personally reviews scope on every addition and ADU we quote because he spent three decades learning what people actually mean when they say “a little more room,” and he’d rather spend an hour arguing about window flashing than a week arguing about an invoice.
All completed work carries the 365-Day Done Right Promise. If the installation fails within a full year, we come back and fix it at no charge. The written guarantee is in your hand at job close, along with a clean site and a scope sheet showing exactly what was agreed, what was installed, and what it cost.
DIY or Call Us?
You can safely check the sticker on your existing ECO units and measure the frame depth. You can clean tracks and replace a damaged screen. What you should not do is pull a full window frame out of a structural opening on a load-bearing wall, especially in a Florida addition where wind-load engineering is code, not preference. If you get the flashing order wrong or fail to seal the sill pan, water gets into the substrate and you won’t see the damage until the drywall swells and the flooring buckles. That repair costs more than the window install did, every time.
For ECO parts that are safe to swap, rollers and locks and weatherstripping, we’re happy to sell you the part and talk you through it on the phone. For frame work, full replacements, and any addition or ADU scope, call (904) 337-5929 and we’ll put a number in writing before we touch anything.
FAQs
Frames and sashes typically last 20 to 30 years in Jacksonville, but the insulated glass seals commonly fail at 10 to 15 years because of our heat and humidity cycle. If you’re seeing fogging, that’s the failure point. Call (904) 337-5929 and we’ll tell you if you’re looking at a glass-unit replacement or something more.
Yes, most ECO windows can be repaired with new gaskets, rollers, locks, or an insulated glass unit, and repair usually costs well under a full replacement. If the frame is rotted or the rough opening is compromised, replacement is the honest fix. We’ll give you a straight diagnosis and a written price either way.
A typical single-room addition runs 3 to 5 months from permit to final inspection, and an ADU runs 5 to 8 months depending on utility work and site conditions. Jacksonville’s permitting office moved online, but plan review times still vary by season, and we quote a realistic window, not a best-case one.
We keep common replacement parts on the truck, including gaskets, roller assemblies, locks, and weatherstripping for the ECO series most common in Jacksonville. Full-frame replacements and custom insulated glass units are ordered to spec with manufacturer lead times quoted in writing before you commit.
Written by Curtis Lane, Owner, Bradford Remodeling Co Jacksonville at Bradford Remodeling Co Jacksonville, serving Jacksonville and nearby areas.
