Island Glass Company replaces tired, single-pane, and failed windows with modern energy-efficient vinyl and aluminum frames across Whittier and the surrounding Southern California cities. A full window replacement improves comfort, cuts utility bills, and brings the house up to current Title 24 energy standards.
What we install
We work with both residential and commercial window systems and size every job to the opening on site.
- Vinyl (uPVC) windows — the best thermal performance in the residential price range. Welded frames, no paint to fail, multi-chambered profiles, insulating dual-pane glass. Popular manufacturers include Milgard, Anlin, Simonton, and Jeld-Wen.
- Aluminum windows — slimmer sight lines and a more commercial look. Required on some historic remodels that need to match existing profiles. Modern aluminum windows use a thermal break to meet Title 24.
- Thermally broken aluminum — the choice for modern architecture where you want narrow frames with code-compliant performance.
Window operating styles include single-hung, double-hung, slider (XO, OX, XOX), casement, awning, picture (fixed), and specialty shapes.
Glass and energy performance
All replacement windows ship with insulating glass units — two lites of tempered or annealed glass separated by a warm-edge spacer, filled with argon gas, and coated with a low-E film to cut solar heat gain. Typical performance specs:
- U-factor: 0.30 or lower (Title 24 prescriptive in most climate zones)
- Solar Heat Gain Coefficient (SHGC): 0.23-0.25 for south- and west-facing glass
- Visible light transmittance: 0.55-0.70 depending on coating
Tempered safety glass is used wherever required by code — within 24 inches of a door, within 18 inches of the floor, adjacent to stairs, or in any wall facing a pool or tub.
Installation process
Most single-family window replacements are completed in one to three days depending on count and size. The crew arrives in the morning, sets drop cloths and interior plastic, removes the old sashes and frames, installs the new unit, flashes and seals the exterior, foams the interior gap, and trims out. We leave the site swept, glass cleaned, and old units hauled away.
For retrofit installations we can go “frame-in-frame” to preserve interior trim and stucco. For full-frame replacements we cut back to the studs and re-flash the opening — the right call when the original installation leaked or the sills are rotted.
Service area
Island Glass Company installs vinyl and aluminum windows in Whittier, Pico Rivera, La Habra, Santa Fe Springs, Norwalk, Downey, La Mirada, Hacienda Heights, Rowland Heights, Brea, Fullerton, La Puente, Montebello, Monterey Park, and Cerritos. Free estimates and honest recommendations — we will tell you whether a repair, retrofit, or full-frame replacement is the right call.