PGT Home Additions & ADU Nationwide

PGT Home Additions & ADU: The Pomona Owner’s Guide

PGT-compatible structural components and window systems for home additions and ADUs in Pomona typically run $45,000-$130,000 installed for a full addition, with PGT window packages for ADU projects generally falling within that range depending on unit count and structural integration. We stock PGT window and door units compatible with standard ADU framing in the Pomona area, and most replacement or new-install orders can be sourced within 24-48 hours through our supplier network. Most Pomona homeowners discover their PGT components need attention when the ADU permit inspection flags a window specification mismatch, or when an existing addition’s PGT units show seal failure after a hot San Gabriel Valley summer.

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Which PGT Models This Applies To

PGT’s product lines for residential additions and ADUs break into a few categories, and matching the right unit to your framing matters more than most people expect. The PGT WinGuard aluminum and vinyl impact lines are the ones we see most often in Pomona ADU builds, particularly the 400 Series and 500 Series single-hung and horizontal roller units specified for California’s Title 24 energy compliance. The PGT EnergyVue vinyl line shows up frequently on second-story additions where thermal performance is prioritized over impact rating.

To identify your exact unit, check the etched mark in the glass corner or the sticker on the frame edge; you’ll find a model prefix (WGA for WinGuard Aluminum, WGV for WinGuard Vinyl, EV for EnergyVue) followed by the size code. The gotcha we run into in Pomona is mixing WinGuard and EnergyVue in the same structural opening; the frame depths differ by 3/8 inch, which doesn’t sound like much until your drywall return doesn’t cover the jamb. We also see homeowners order standard PGT units when the addition footprint triggers Pomona’s wind-load requirements for the foothill zones near Ganesha Hills or Phillips Ranch. OEM PGT units carry the full factory warranty and exact color match; quality aftermarket equivalents from CWS or CGI exist for non-impact applications, but we quote PGT factory units for any project where the permit set specifies them by name.

Signs Your PGT Home Additions & ADU Is Failing

• Condensation between glass panes. The insulated glass unit (IGU) seal has failed, which means the desiccant inside the spacer bar is saturated and the low-E coating is degrading from moisture exposure. In Pomona’s inland heat, this accelerates once it starts; we see it most on south-facing ADU units above unconditioned garages.
• Difficulty latching or locking. The sash has dropped out of square, either from thermal cycling warping the vinyl frame or from the installation shims compressing over time. On PGT horizontal rollers, the tandem roller assembly may have flat-spotted from debris in the track.
• Visible daylight or air infiltration at the frame perimeter. The installation foam has shrunk or the sealant bead has separated from the stucco or siding substrate. This is common in Pomona additions where the original contractor used non-UV-stable sealant on a dark exterior wall.
• Cracked or chipped impact glass with intact interlayer. The WinGuard laminated glass has done its job; the interlayer is holding shards in place. But the structural integrity is compromised, and the unit won’t pass inspection if the crack intersects the sight line or exceeds 6 inches in length.
• Frame corrosion or pitting on aluminum units. The anodized finish has been breached, usually from incompatible cleaning chemicals or salt-laden Santa Ana winds on exposed second-story additions. Once pitting starts, the frame section loses its design wall thickness.

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Replacement Cost & What’s Included

The range depends on three things: unit size and series (WinGuard impact costs more than EnergyVue), whether the original opening needs reframing for current code, and exterior finish repair after the swap. Our quotes include the PGT factory unit, freight from the Southeast distribution center, removal and disposal of the old unit, installation per PGT’s fastening schedule, insulation and sealant, and interior/exterior trim repair to match existing. Under Clause 1 of the Haven Standard, you get that number in writing before we order anything. The 365-Day Done Right Promise covers installation workmanship; PGT’s factory warranty covers the unit itself, typically 10 years on glass and lifetime on frames for original owners.

DIY or Call Us?

There’s a short list of what a homeowner can safely check before calling. Verify the model number from the glass etch. Measure the daylight opening width and height. Check the track for debris if the sash rolls poorly. That’s about it.

What goes wrong with DIY on PGT units starts with the weight; a 48-by-60 WinGuard horizontal roller runs 120 pounds and needs two people with suction cups just to maneuver without torqueing the frame. The fastening pattern is specific; PGT requires screws through the jamb, not the sill, and into structural framing at 8-inch centers. Miss that, and the unit fails inspection. The bigger risk is the impact glass itself; if you crack the laminate during handling, you’re buying another unit. We carry the suction rigs, the PGT-approved fasteners, and the foam backer rod for the sealant joint. Call (626) 606-1081 and we’ll schedule a free estimate; we bring the catalog, measure your openings, and give you the installed price before anything ships.

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