ECO Window Systems Home Additions & ADU Nationwide

ECO Window Systems Home Additions & ADU: The Pomona Owner’s Guide

We stock and install ECO Window Systems-compatible window and door assemblies for home additions and ADU projects in Pomona, with typical installed pricing from $45,000 to $130,000 for full additions and $90,000 to $220,000 for detached ADUs. Most ECO Window Systems spec jobs in the Pomona Valley can be quoted within 48 hours and started within two to three weeks once permits clear. Owners usually discover an issue when their addition’s ECO units show seal failure after a hot San Gabriel Valley summer, or when the sliding door track binds after the frame shifts in our clay-heavy soils near Ganesha Hills or Phillips Ranch.

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Which ECO Window Systems Models This Applies To

ECO Window Systems produces several product lines common in Southern California additions and ADUs: the ECO 5000 Series vinyl single-hung and horizontal sliders, the ECO 8000 Series thermally broken aluminum, and the ECO Elite composite line used in higher-end Pomona infill projects. The critical compatibility check is the frame depth, measured from the interior stop to the exterior nailing fin. The 5000 Series runs 2-5/8 inches, the 8000 Series 3-1/4 inches, and the Elite line 3-1/2 inches. Mixing these in a replacement scenario means the drywall return and exterior stucco edge won’t line up without costly reframing.

To identify your unit, open the sash and look for the etched manufacturing label in the upper right corner of the glass. It’ll show the series number, the glass package (ECO-270, ECO-366, or the newer ECO-340 low-E), and the NFRC ratings. We carry OEM ECO sash packs and hardware, but for units out of production we source from C.R. Laurence and Milgard aftermarket equivalents that match the thermal performance specs. The aftermarket route saves roughly 15 to 20 percent on material, though we always confirm the U-factor and SHGC match or beat the original before we write it into the scope. Under Clause 1 of the Haven Standard, that written spec is what you’ll see on the invoice.

Signs Your ECO Window Systems Home Additions & ADU Is Failing

• Condensation between glass panes. The insulated glass unit (IGU) seal has failed, letting moist Pomona air into the space between lites. Once the desiccant saturates, the fogging becomes permanent and the low-E coating starts degrading from moisture exposure.
• Sliding door rollers grinding or jumping track. The nylon or stainless roller assemblies have flattened or the axle has corroded, common in ADU units near ground level where irrigation overspray hits the sill. Continued use damages the extruded aluminum track, turning a $45 roller swap into a $400 full-sill replacement.
• Sash won’t stay open or slams shut. The balance system, either coil constant-force or block-and-tackle, has lost tension or the pivot bar has cracked. In ECO’s older 5000 Series units, the balance shoe wears a groove in the jamb liner that no new balance can grip properly.
• Air infiltration at the meeting rail or sill. The weatherstrip pile has compressed past recovery or the fin seal has torn at the corners. Pomona’s Santa Ana wind events will find every gap, and the thermal bypass shows up as hot spots in summer and cold drafts in winter.
• Frame corners separating or sill bowing. The mechanical or heat-welded joints have stressed from thermal cycling or structural settlement. In additions built on post-tension slabs or hillside foundations with more movement, this shows up first at the sill level where water pools if the weep holes clog.

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Replacement Cost & What’s Included

For a Pomona home addition or ADU using ECO Window Systems products, full replacement of all windows and sliding doors typically falls between $45,000 and $130,000 for attached additions, and $90,000 to $220,000 for detached ADUs, depending on square footage and whether we’re matching existing trim profiles or starting fresh. A single ECO sash pack replacement runs $400 to $900 installed; a full-frame replacement with exterior trim integration runs $1,200 to $2,800 per opening.

What drives the range: the condition of the existing framing and weather barrier, whether stucco or siding repair is needed, and if the original installation used proper sill pan flashing (it often didn’t, pre-2015). Our quote includes the unit, installation per ECO’s published fastener schedule, low-expansion foam insulation, interior and exterior trim integration, and disposal. The 365-Day Done Right Promise covers the installation; the ECO factory warranty covers the glass and hardware, which we register on the customer’s behalf. Every visit includes a documented photo record, standard, not extra.

DIY or Call Us?

An owner can safely check the label location, measure rough openings from the interior, and clear weep holes with a pipe cleaner. What goes wrong fast: removing a fixed sash or operating panel without supporting the frame risks racking the unit and voiding the warranty. The ECO 8000 Series aluminum frames are light but sharp, and a slip with a pry bar in a second-story opening is not a good Saturday.

More critically, full-frame replacement involves disturbing the weather-resistive barrier and integrating with existing stucco or siding. Done wrong, water enters the wall cavity and shows up as damage two years later, well past any recourse. We pull permits on every addition and ADU window package, and we pass inspection. If you’re weighing the DIY route, bring us your measurements and we’ll review them against our site verification at no charge. Measure twice, then we can talk. Call (626) 606-1081 to schedule your free estimate.

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