New windows and doors improve comfort, cut energy bills and add long-term value to your home. Westlight Windows San Jose pairs proven product lines with our own installing crews for lasting performance - and a price we put in writing.
Choose your installer
The unit is half the job - the install is the other half. Our own background-checked crews measure, set, seal and insulate every opening, and they know the lines we quote inside and out because they install them every week.
Select the right products
Compare styles, materials and glass packages side by side until the fit is right for your rooms, your budget and your goals. The product-line comparison below is the place to start.
Prepare your home for install
Before install day we walk you through a short checklist - furniture pulled back, treatments down, a clear path to each opening - so install day is watch-it-happen, not scramble.
Compare the Lines We Quote
Every project is priced on the same lines, side by side - the price indicators below are relative, and your consultant shows exact numbers on your actual openings.
PGTThe line homeowners arrive naming - the most impact certifications in the industry$$$
- More impact certifications than any other line we quote
- WinGuard, EnergyVue and ClassicVue Max systems built for every wind zone
- 99% on-time delivery keeps your install date on the calendar
CGIThe heavyweight impact line$$$$$
- Large-missile impact ratings for the strictest wind zones
- Architectural-grade aluminum with commercial-depth frames
- The line we quote when protection is the whole point
CWSThe value pick$$
- Vinyl systems built to strict wind codes
- Strong energy packages at the friendliest price point
- The smart start for whole-home replacements on a budget
ESWSlim lines, big glass$$$$
- Narrow-sightline aluminum for modern elevations
- Oversized openings and floor-to-ceiling glass
- Impact-rated without the bunker look
ECOThe aluminum impact workhorse$$$
- Factory-built aluminum impact systems
- A strong price-to-protection ratio for coastal homes
- Proven inventory lines with short lead times
Window Company in Cupertino, CA
Cupertino’s homes ask more of window and door work than most Bay Area cities. The housing stock swings from 1950s Eichlers with floor-to-ceiling glass to 1970s ranchers with original aluminum frames, and the foothill neighborhoods near Rancho San Antonio face wildfire exposure that flatland cities like Sunnyvale don’t. We’re Westlight Windows & Doors, an independently owned and operated Kingswell location. We handle window replacement, window installation, and door installation across Cupertino, and we put every price in writing before work starts. Call (669) 333-7786 for a free estimate.
Why Cupertino Homes Are Different
Cupertino’s housing stock is dominated by single-story ranchers and Eichler homes built between the 1950s and 1970s. In the central Eichler tracts, original floor-to-ceiling glass walls and narrow aluminum mullions are still everywhere. Retrofitting those with modern dual-pane units takes custom edge spacers and non-invasive framing so the mid-century look survives. You won’t find that challenge in the stucco subdivisions of neighboring West San Jose.
Climate is the second factor. Cupertino’s warm, dry summers with heat spikes push demand for low-e glass and UV control in the valley neighborhoods, while the hillside areas above Montebello Ridge and Rancho San Antonio see strong winds and serious wildfire risk. Up there, dual-pane, tempered, and ember-resistant glazing isn’t an upgrade, it’s what the code and the fire marshal expect. Many homes have been remodeled over the years too, which means old single-pane sliders sit next to newer insulated units, and every job involves matching new work to what’s already in the wall.
Our Main Cupertino Services
Most Cupertino homeowners call us for two things: replacing windows that leak air and don’t seal, and installing new doors that actually close square. Here’s what each involves here.
Window Replacement in Cupertino
Replacing windows in Cupertino usually means pulling original aluminum frames out of 50- and 60-year-old openings and installing dual-pane units sized for the same rough openings. In Eichler tracts, we preserve the original sightlines with slim mullions and custom edge spacers. In the foothills, we move toward tempered, ember-resistant glazing to meet wildfire code. Every job gets low-e glass as a baseline, which cuts heat gain in summer and heat loss in winter. See the full breakdown on our Window Replacement in Cupertino page.
Window Installation in Cupertino
Window installation in Cupertino often involves retrofit work on homes where adding or enlarging windows means cutting into stucco, drywall, or mid-century wood siding. We handle new-construction windows for additions and remodels too, plus the re-installation of units that were pulled during renovation and need to go back in correctly. Proper flashing matters more in the foothill zones, where wind-driven rain finds any gap. Details are on the Window Installation in Cupertino page.
Door Installation in Cupertino
Door installation in Cupertino tends to focus on entry doors and sliding patio doors, many of which date to the original build and have warped frames, worn rollers, and weatherstripping that gave up years ago. In Eichler homes, sliding glass doors are often the primary light source, so getting the track alignment right matters for both security and insulation. We install Therma-Tru entry doors and premium sliders with proper flashing and threshold sealing. Full scope is 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 install products from eight manufacturer lines, including impact-rated PGT and CGI, energy-efficient ECO Window Systems, and Therma-Tru entry doors. For Cupertino’s foothill homes, PGT and CGI impact-rated units are common calls. See our brands page for the full lineup and what fits your home.
Pricing for Window Company in Cupertino, CA
| Service | Typical Range in Cupertino |
|---|---|
| Single window replacement (standard size, low-e, installed) | $700 – $1,200 per window |
| Full-home window replacement (10 – 15 windows) | $9,000 – $18,000 |
| Eichler retrofit window with custom edge spacers | $1,100 – $2,100 per unit |
| Impact-rated window (PGT or CGI, foothill homes) | $1,400 – $2,600 per window |
| New window cut-in and install (stucco or wood siding) | $1,100 – $2,400 per window |
| Sliding glass door replacement (standard 6-foot) | $1,800 – $3,600 installed |
| Therma-Tru entry door installation | $2,200 – $4,800 installed |
| Ember-resistant glazing upgrade (per window) | $400 – $900 added to base cost |
| Custom retrofits for remodeled homes (mixed old/new framing) | $1,300 – $2,800 per opening |
| Full door and window package (moderate remodel) | $12,000 – $28,000 |
Cupertino prices move upward on Eichler retrofits because of the custom edge spacers and non-invasive framing, and on foothill work because impact-rated and ember-resistant glazing costs more than standard dual-pane. Wherever your job lands, you get a written price before any work starts, and that price doesn’t change at the door.
Neighborhoods We Serve in Cupertino
We work across the full city, from the Eichler tracts around central Cupertino to the newer foothill subdivisions. Our crews know the terrain and the housing stock in each area.
- Central Cupertino (Eichler tracts)
- Monta Vista
- Rancho San Antonio foothills
- Montebello Ridge area
- Seven Springs and the west valley neighborhoods
Typical response time for an estimate visit in Cupertino is within a few business days, and our phone line is answered by a real person any time you call.
Service Area – Cities Near Cupertino
Westlight Windows & Doors serves Cupertino and several surrounding South Bay and Peninsula cities. If you’re in a neighboring area, you can check service details for Sunnyvale, CA, Mountain View, CA, Los Altos, CA, or Stanford, CA. Dispatch and scheduling coordinate from our San Francisco Bay Area office, and Cupertino crews work locally.
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
We schedule estimate visits in Cupertino within a few business days in most cases. The best way to know exactly is to call (669) 333-7786 and talk to a live person, any day, any hour. We’ll give you a confirmed arrival window, not a vague “sometime this week.”
Some do, especially in designated historic districts or where the original glass walls define the architectural character. We pull permits when required and coordinate inspections so the work passes the first time. We’ll tell you upfront what your specific home needs.
Yes. Many Cupertino homes mix original 1950s – 70s windows with newer units from prior remodels, and we size and finish new work to match the existing sightlines, frame color, and glass type. It’s one of the most common jobs we do in the central and west valley neighborhoods.
When you’re ready to price out your Cupertino job, call Westlight Windows & Doors at (669) 333-7786. Owen Satterfield leads the team, and every estimate is free. You’ll get a written price before any work begins, and the Kingswell Guarantee stands behind the work: a committed arrival window, a clean job site, and a written guarantee handed to you when the job is done. If anything isn’t right within the guarantee period, we come back and fix it at no charge. Call us to schedule your free estimate.
Six Reasons Homeowners Choose Westlight Windows San Jose
Laminated glass and reinforced frames hold up to wind-driven rain, hail and flying debris, so your openings stay sealed when the weather turns.
Low-E insulated impact glass from our manufacturer lines commonly cuts monthly cooling bills 20-30%.
Laminated impact glass shuts out up to 40% of outside noise - traffic, neighbors, weather.
Monitoring services run $30-90 a month. Laminated impact glass resists forced entry around the clock, with no subscription.
Tighter seals and insulated glass even out hot and cold rooms and stop the drafts at the frame.
A full impact package upgrades curb appeal, buyer confidence and appraised value in one project.
Other Westlight Windows San Jose Services
What Neighbors Say About Westlight Windows San Jose
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 sliding patio door had come off its track years ago and we just lived with it. New one is smooth as butter. They hauled off the old one and vacuumed up before they left."
- Jessica Landry"Replaced a big picture window that had a failed seal and was always foggy. Can finally see the yard again. On time, tidy, and they stood behind the install with a written guarantee."
- Carol Whitaker"Replaced eight drafty old windows that were basically single pane. The house is warmer already and the street noise is way down. Crew was on time both days and the price was exactly the quote."
- Harold Bemis