Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
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AfterWindow Company in Cupertino, CA
Westlight Windows & Doors handles window replacement, window installation, and door installation across Cupertino, CA. Most of the homes we work on here are 1,100 to 1,800 square foot ranch and split-level tract houses built between 1955 and 1980, and many still have their original aluminum-frame single-pane windows. Cupertino summers push into the low-to-mid 90s even when the rest of the Bay Area stays mild, so the glazing choices we make here lean heavily toward low-SHGC dual-pane glass. Owen Satterfield leads our crew, and every job starts with a written price before any work begins. Call (903) 354-7134 to talk through your project.
Why Cupertino Homes Are Different
Cupertino sits in CEC Climate Zone 4 at the base of the Santa Cruz Mountains, and the afternoon heat is real. Low-SHGC glazing (glass coatings that block solar heat while letting in light) is a practical necessity here, not an upsell. The western foothill neighborhoods, especially Monta Vista, sit near or inside the wildland-urban interface, where insurers and fire-risk assessors increasingly ask for tempered or multi-pane fire-resistant glazing on hillside-facing exposures.
Housing stock matters too. The tract homes that fill most of Cupertino were built with aluminum windows that conduct heat and leak air. Full window-package replacements are common, and many owners are also adding ADUs, which require permitted fenestration under current Title 24 energy standards. Cupertino’s permit technicians apply those standards strictly. When a certificate of compliance doesn’t match the CEC-approved product directory listing – a U-factor or SHGC mismatch – the inspector flags it and the job gets delayed. We handle that paperwork on every permitted job so the re-inspection happens once, not twice.
Our Main Cupertino Services
Window replacement and door installation are the two jobs Cupertino homeowners call us about most. Window installation for new construction and ADU builds runs a close third. Each service has its own page with full pricing and process details.
Window Replacement in Cupertino
Replacing original single-pane aluminum windows in a 1960s or 1970s Cupertino tract home usually means full-frame work, not pocket inserts. We pull the old frame, inspect the rough opening, and install new construction-grade windows sized correctly for the opening. The local climate zone means we default to low-SHGC dual-pane glass for west and south exposures. Full details on pricing, lead times, and what happens during the job are on our dedicated Window Replacement in Cupertino page.
Window Installation in Cupertino
New builds and ADUs in Cupertino need windows installed to current Title 24 standards, and the permit office here checks the paperwork closely. We supply and install windows from our eight manufacturer lines and make sure the U-factor and SHGC ratings on the certificate of compliance match the product directory listing before the inspector arrives. For homeowners adding an ADU, we coordinate with the general contractor or handle the fenestration scope directly. See the Window Installation in Cupertino page for the full breakdown.
Door Installation in Cupertino
Front-door projects in Cupertino carry a set of considerations you won’t hear about in most Bay Area cities. A large share of homeowners here request specific colors, hardware finishes, and threshold orientations for feng shui reasons, including avoiding white or gray doors and keeping the entry path clear of staircases and bathrooms. We carry Therma-Tru entry doors and work with those specifications rather than pushing a stock option. Details on door styles, materials, and lead times are on the Door Installation in Cupertino page.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Cupertino
We stock and install products from eight manufacturer lines, including PGT and CGI for impact-rated needs, ECO Window Systems for energy performance, and Therma-Tru for entry doors. Parts and samples for Cupertino projects are staged at our Bay Area office, which keeps typical lead times tight. See our brands for the full list.
Pricing for Window Company in Cupertino, CA
| Service | Typical range in Cupertino |
|---|---|
| Entry door replacement (single) | $1,600-$4,200 installed |
| Patio door replacement | $2,000-$5,500 installed |
| Single-hung window replacement (standard size) | $600-$1,200 per window |
| Double-hung window replacement (standard size) | $700-$1,400 per window |
| Casement window replacement (standard size) | $750-$1,600 per window |
| Bay or bow window replacement | $3,200-$7,000 installed |
| Vinyl frame window replacement | $500-$950 per window |
| Aluminum frame window replacement | $550-$1,000 per window |
| Wood frame window replacement | $850-$1,800 per window |
| Impact-rated window replacement (small to mid) | $1,100-$2,300 per window |
| Full-house window package (10+ windows) | $12,000-$35,000 total |
What pushes a Cupertino job toward the top of these ranges is usually the size of the opening, a hillside exposure that calls for tempered or fire-resistant glass, or a full-frame replacement instead of a pocket insert. Whatever the number, you get it in writing before any work starts – no revised invoices at the door.
Neighborhoods We Serve in Cupertino
We work across the entire city, and most neighborhoods fall within a short drive of our Bay Area scheduling office. The neighborhoods below give you a sense of the coverage area.
- Monta Vista
- Rancho Rinconada
- Seven Springs
- Garden Gate
- Oak Valley
For most Cupertino jobs, we schedule a committed arrival window and keep it. You’ll know who is coming, what they’re doing, and what it costs before the crew shows up.
Service Area – Cities Near Cupertino
Beyond Cupertino proper, we serve homeowners in the surrounding West Valley and mid-Peninsula cities. If your home is in Saratoga, CA, Sunnyvale, CA, Mountain View, CA, or Santa Clara, CA, the same written-price guarantee and window-and-door scope apply. Homeowners in the Cupertino foothills often ask whether the hillside fire-risk requirements affect the job, and the answer is yes, mostly on west-facing exposures.
Serving Cupertino, CA - Our Local Coverage Area
We’re based in the Cupertino area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Window Company in Cupertino
Yes, when the scope requires it. Replacement windows that change the rough opening size or structural framing need a permit, and so do most new-construction or ADU window installations. We handle the Title 24 documentation and certificate of compliance so the inspection passes the first time. Call (903) 354-7134 if you want to know whether your specific project needs one.
Most window and door projects in Cupertino get scheduled within one to three weeks, depending on product lead time and whether the job is a standard replacement or a custom order. We give you a committed arrival window in writing and the crew shows up in that window. Call (903) 354-7134 for current scheduling.
We do. Several Cupertino neighborhoods have architectural review requirements for window and door changes, and we provide the product specifications, drawings, and material samples your HOA needs. If the board asks for a specific glazing type or door finish, we’ll match it and document it. The written price you get before work starts covers the whole scope.
What happens when you call
- 1A real person answersNo phone trees - talk to a local windows & doors pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Cupertino Customers Say
"Our energy bill in summer was brutal. New windows made a real dent in it. Salesman wasn't pushy and didn't do the fake "today only" discount thing the others tried."
- Bethany Oh"Two bedroom windows that never opened and one that wouldn't stay up. All replaced in an afternoon. The crew was clean, hauled off the old frames, and the quote held."
- Colette Rhee"Got quotes from three companies. Westlight wasn't the cheapest but they were the only one who measured everything carefully and put it all in writing. Worth it. No surprises on install day."
- Craig Dillard