ECO Window Systems Home Additions & ADU Nationwide

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

ECO Window Systems-compatible window and door assemblies for home additions and ADU projects in San Diego typically run $53,100-$153,400 installed, depending on whether you’re matching existing ECO Window Systems units in a primary residence or specifying new construction for a detached ADU. We stock ECO Window Systems replacement sashes, frames, and hardware for same-day evaluation on most series, and we carry compatible flashing and sealant profiles on every truck. Most San Diego owners first notice trouble when an addition window won’t stay open, the sash won’t lock square, or they feel Pacific moisture infiltration along the frame after a marine layer morning.

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Which ECO Window Systems Models This Applies To

ECO Window Systems produces several product lines that appear regularly in San Diego additions and ADUs built between 2005 and 2020. The ECO 5000 series vinyl single-hung and the ECO 7000 series vinyl horizontal slider are the two we encounter most often in Mission Hills and North Park infill projects. To identify your unit, open the sash and look for the engraved production code in the top track or on the spacer bar between glass panes; the first four digits indicate the series, and the next six are the manufacturing date.

The 5000 series uses a 2-5/8″ frame depth with a constant-force balance system, while the 7000 slider runs 3-1/4″ deep with a tandem roller carriage. Aftermarket balances and rollers exist for both, but we source OEM ECO Window Systems replacement sashes when the insulated glass unit has failed, because the glazing bead profile is proprietary and third-party substitutes often leave a visible gap at the lock rail. For hardware and weatherstrip, we use an aftermarket equivalent from our vetted supplier list that matches the OEM compression spec, documented in your written quote.

Signs Your ECO Window Systems Home Additions & ADU Is Failing

• Sash drops or won’t stay open. The constant-force balance coil has fatigued, usually after 12-15 years of San Diego’s UV exposure and salt air near the coast. The coil loses tension gradually; you may not notice until the sash won’t hold at half-mast on a warm afternoon.
• Visible moisture or fog between glass panes. The insulated glass unit (IGU) seal has failed, allowing Pacific moisture to penetrate the air gap. In San Diego’s climate, this accelerates once the desiccant saturates, typically showing first as a haze that clears by noon but eventually persists.
• Lock won’t engage or pulls out of alignment. The keep (the stationary receiver) has shifted due to frame expansion or the original installation settling in the addition’s newer framing. On ECO 7000 sliders, this often traces to roller wear that drops the sash out of square.
• Draft or temperature stratification near the window. The bulb weatherstrip has compressed past recovery, or the interlock where meeting rails overlap has gapped. San Diego’s Santa Ana wind cycles stress this seal more than steady climates do.
• Frame corners show cracking or separation. The vinyl compound has thermally cycled beyond its design range, common in south-facing ADU windows without adequate overhang. ECO’s earlier formulations (pre-2012) are more susceptible than current spec.

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Replacement Cost & What’s Included

For an ECO Window Systems-focused home addition or ADU project in San Diego, our installed range is $53,100-$153,400. A single sash replacement on an existing ECO unit runs toward the lower end; full-frame replacement in a new addition or detached ADU with matching trim and interior finish moves toward the upper range. The line-item written quote specifies: removal and disposal of the failed unit, OEM or equivalent replacement, new fasteners and sealant, interior and exterior trim integration, and a documented photo record of the rough opening condition before we close the wall.

Under Clause 1 of The Haven Standard, that written price is delivered before any work starts. No change proceeds without a signed change order. The 365-Day Done Right Promise covers the installation, and the manufacturer’s warranty runs on the replacement unit itself. We pull permits when the scope requires it and pass inspection before final payment.

DIY or Call Us?

An owner can safely check the model code and photograph the failure for our review. You can also verify that the window is square in the opening with a tape measure, corner to corner; a 1/4″ or greater difference indicates frame settlement that a new sash alone won’t fix.

Where DIY goes wrong is in the removal of a fixed sash or IGU replacement. ECO Window Systems units use a snap-in glazing bead under spring tension; without the proper paddle tool, the bead distorts and won’t reseat, and the IGU is heavy enough to cause back or hand injury if mishandled. We don’t recommend homeowner removal of any unit above ground floor. Call (858) 434-8926 and we’ll schedule a free evaluation with a written price before any work starts.

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