ES Windows Home Additions & ADU Nationwide

ES Windows Home Additions & ADU: The San Jose Owner’s Guide

We stock and install ES Windows-compatible window systems for home additions and ADU projects across San Jose, with typical installed pricing from $53,100 to $153,400 for full additions and $106,200 to $259,600 for detached ADU construction. Most ES Windows specification reviews and replacement orders ship same-day from our San Jose warehouse. Homeowners usually discover an issue when their addition’s windows no longer seal properly against Santa Clara Valley’s temperature swings, or when an inspector flags the glazing spec against Title 24 energy code during ADU plan check.

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Which ES Windows Models This Applies To

ES Windows manufactures impact-resistant and energy-efficient glazing systems primarily for the Florida and Caribbean markets, but their 3000 Series, 5000 Series, and ES-HV (High Velocity) lines appear regularly in San Jose ADU plans where architects specify Miami-Dade NOA-rated products for hillside wind-exposure zones. The critical compatibility check is the DP (Design Pressure) rating stamped on the aluminum frame’s interior edge, not the glass label alone. A DP-50 ES-HV unit will not substitute for a DP-60 where San Jose’s local amendment requires the higher rating near the Calaveras Fault zone.

We source OEM ES Windows sashes, balances, and weatherstrip kits through the manufacturer’s California distributor in Ontario, with typical freight of three to five business days. For faster turnaround, we stock aftermarket laminated glass assemblies from Cardinal and Guardian that meet the same DP and SHGC specs at roughly 15% lower unit cost. The aftermarket route requires our glazing subcontractor to recertify the assembly label, which adds one inspection day but saves roughly $340 per opening on a typical Willow Glen ADU.

Signs Your ES Windows Home Additions & ADU Is Failing

• Visible moisture between glass panes. The insulated glass unit (IGU) seal has failed, allowing San Jose’s morning fog to condense inside the air gap. This means the low-E coating and argon fill are compromised, and the window’s U-factor has likely degraded from 0.30 to near 0.45.
• Sash drags or binds in the track. ES Windows’ tandem roller assemblies use a nylon housing that fatigues under cyclic loading; in south-facing San Jose additions, thermal expansion accelerates the wear. The sash may appear level but the roller axle has ovalized its bore.
• Air infiltration at the meeting rail. The interlocking weatherstrip has compressed permanently or the wool pile has shed its fin. In Almaden Valley homes we see this where afternoon winds press the inactive leaf against a deformed seal.
• Cracked or delaminated impact glass. The polyvinyl butyral (PVB) interlayer has separated from the lite, usually from edge damage during installation or thermal stress at an unshaded west exposure. The window still stands but the impact rating is void.
• Corrosion at the weep holes or frame corners. ES Windows’ 5000 Series uses a 6063-T5 aluminum alloy that can galvanize against incompatible fasteners; San Jose’s winter rainwater, mild as it is, pools in blocked weep tracks and initiates pitting.

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Replacement Cost & What’s Included

The range depends on three factors: whether the existing frame is square and reusable, whether Title 24 triggers a full-glass upgrade to lower SHGC, and whether the stucco or siding surround needs repair after extraction. Our written quote itemizes each line before work starts, per Clause 1 of the Haven Standard. The 365-Day Done Right Promise covers installation labor and materials; glass breakage from impact is excluded but carries a separate manufacturer’s warranty through ES Windows or our aftermarket supplier.

DIY or Call Us?

An owner can safely verify the DP rating and photograph the failed unit’s label for our parts desk. What goes wrong after that: impact-rated windows weigh 40% more than standard units, and a misaligned sash in a two-story addition over a San Jose hillside creates a fall hazard plus a failed inspection. The PVB interlayer in impact glass requires specialized cutting tools; score-and-snap methods shatter the lite. Weep hole cleaning and weatherstrip replacement are owner-accessible, but any work affecting the structural attachment or the air/water barrier should involve a C-17 glazing contractor. If you’re holding a written estimate from another San Jose contractor, we’ll review it line by line at no charge. Call (669) 271-8644 to schedule.

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