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ECO Window Systems Home Additions & ADU: The Fort Worth Owner’s Guide
A full home addition or ADU built around ECO Window Systems glazing in Fort Worth typically runs $45,000 to $130,000 installed, depending on square footage, foundation work, and how many ECO units the design calls for. We stock and install ECO-compatible window packages as part of our addition and ADU builds, and we can usually source any ECO Series unit within 3 to 5 business days. If you’re reading this because a window on your existing addition has failed, or because you’re planning new square footage and want ECO glass specified from the framing up, this is the page that tells you what it costs, what fails, and what to expect.
Most Fort Worth owners discover a problem two ways: a room that won’t hold temperature during a July heat wave, or a window that’s fogged between the panes and won’t clear. Both point to the same thing, a seal or frame issue on the ECO unit itself. Curtis Lane has pulled failed ECO units out of additions near TCU and Benbrook where the glass was fine but the glazing bead had given up, and the fix was simpler than the homeowner assumed.
Which ECO Window Systems Models This Applies To
ECO Window Systems builds several series lines, and the compatibility picture matters more than most homeowners expect. The majority of residential additions and ADUs in Fort Worth use the ECO 200 or ECO 300 series, which are vinyl-frame, double-pane units with a sloped sill and a standard 3-1/4 inch frame depth. The ECO 200 runs narrower glass packages, typically 5/8 inch insulated glass, while the ECO 300 steps up to 3/4 inch and adds a reinforced meeting rail. The 400 series shows up on higher-end additions, usually where the designer wanted a heavier frame profile or triple-pane glass.
Here’s the gotcha: ECO changed its frame extrusion profile in 2019. Units built before that year used a square glazing bead; units built after use a radiused bead. They are not interchangeable. If you have a 2018 ECO 200 with a cracked sash, you cannot drop a 2021 sash into the same frame. We check the extrusion date stamp on the inside of the frame, not the glass, before we order anything.
On the OEM versus aftermarket question: for ECO-specific hardware like sash locks, tilt latches, and glazing bead, we use OEM. The tolerances on ECO extrusions are tight enough that aftermarket hardware binds or gaps. For glass, a quality local Fort Worth glass fabricator can cut an insulated unit to ECO specs at roughly 60 to 70 percent of OEM glass cost, and we do that regularly on out-of-warranty units. For anything structural, the frame itself, the meeting rail, the sill, we order ECO OEM. No exceptions.
Styles & brands we work with
Signs Your ECO Window Systems Home Addition & ADU Is Failing
- Fog between the panes that won’t clear. The desiccant inside the spacer bar is saturated, which means the seal has failed. The glass isn’t broken, but the insulating gas is gone and the unit’s thermal performance is done. On a Fort Worth August afternoon, you’ll feel it as a warm face on the glass from inside the room.
- Condensation on the interior glass surface in winter. This is different from fog between panes. Interior condensation usually points to the frame leaking air around the sash, often a worn weatherstrip or a sash that’s dropped out of square. The ECO unit itself may be fine, but the opening is leaking conditioned air.
- The sash sticks, binds, or drops when you open it. ECO balance mechanisms are coil-spring units inside the frame side channels. When the spring fatigues, the sash won’t stay up or fights you on the way down. It’s a fifteen-minute fix with the right part, but the wrong spring tension makes it worse.
- Visible daylight or dust trails around the sash perimeter. The wool pile weatherstrip on ECO sashes compresses over time, especially on west-facing additions that take the full Fort Worth afternoon sun. Once daylight shows at the meeting rail, air and dust are moving through, and your HVAC is working harder than it should.
- Water staining on the interior drywall below the window. On additions and ADUs with stucco or brick veneer, this is usually a failed sill pan or an improperly lapped flashing detail behind the exterior cladding, not a defect in the ECO window itself. We see it most often on older Fort Worth additions where the original installer skipped the pan flashing.
See the difference
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AfterReplacement Cost & What’s Included
If you’re replacing a failed ECO unit inside an existing addition, a single sash with OEM glass and labor runs $350 to $900, depending on size and series. A full frame replacement, where the entire window comes out and a new ECO unit goes in, runs $900 to $2,400 per opening in Fort Worth, including flashing, trim, and interior drywall repair where the old frame fought back.
For new construction, meaning an addition or ADU where ECO windows are specified from the start, figure $45,000 to $130,000 for the entire project. The window package itself, say six to ten ECO 300 units with standard Low-E glass, represents roughly 4 to 7 percent of that total, but the framing decisions around those windows, opening sizes, header spans, and flashing details, are where Bradford Remodeling’s written scope keeps the number from moving.
Every ECO replacement or new-install we quote includes the written price before work starts, the window units themselves, installation labor, flashing and sealant, interior trim, and haul-off of the old units. We register the manufacturer warranty on every new ECO window, and our own work carries the 365-Day Done Right Promise: if anything we installed fails inside a year, we come back and correct it at no charge.
DIY or Call Us?
A homeowner can check a lot without picking up a tool. Note the extrusion date stamp on the inside frame. Check whether the fog is between the glass or on the interior surface. Run a dollar bill along the closed sash to test weatherstrip compression. Those answers tell us what we’re dealing with before we arrive.
What you should not do is pull a sash out of an ECO frame to replace a balance, or attempt a full frame replacement on an addition wall. The glass unit is heavy, the balance springs are under tension, and a dropped sash takes out drywall and trim on the way down. On anything load-bearing, which most addition windows are once you open the rough opening, you’re also dealing with the header. If you’re in Fort Worth and the window is on a wall holding roof load, call (682) 204-4897 and let us look at it. Estimates are free, and the price you get is the price we work to, written, before anything gets ordered.
FAQs
How long do ECO Window Systems windows last in Fort Worth?
An ECO insulated glass unit in a properly flashed Fort Worth addition should hold its seal for 15 to 20 years. The Texas sun is hard on west-facing units, and we’ve seen seal failures at 12 years on additions where the glass takes direct afternoon heat daily. The frame itself, the vinyl extrusion, will outlast the glass by decades.
Can a fogged ECO window be repaired instead of replaced?
In most cases, no. The insulated glass unit is a sealed assembly, and once the seal fails and the desiccant saturates, the fix is new glass. We can rebuild the sash with new glass in our shop or on site, which is cheaper than a full window replacement, but the failed seal itself cannot be restored. Call (682) 204-4897 and we’ll tell you which route makes sense for your unit.
How long does an ECO window replacement take?
A sash replacement, where we swap the glass and keep your existing frame, takes about 90 minutes per window once the glass is in hand. A full frame replacement takes half a day per opening, more if we’re cutting back stucco or brick to reflash. Glass lead time in Fort Worth runs 3 to 5 business days for standard ECO Low-E packages.
Do you stock ECO Window Systems parts in Fort Worth?
We stock common ECO 200 and 300 series hardware on the truck: coil balances, tilt latches, sash locks, weatherstrip, and some standard-size insulated glass units. Anything outside that, including full frames and oversized glass, we order direct from ECO or cut locally with a Fort Worth fabricator, usually a 3 to 5 day turnaround. We also stock and install parts for KraftMaid, Cambria, and Silestone products on our kitchen and bath projects.
Written by Curtis Lane, Owner, Bradford Remodeling Co Fort Worth at Bradford Remodeling Co Fort Worth, serving Fort Worth and nearby areas.
