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 Los Altos, CA
Westlight Windows & Doors handles window replacement, window installation, and door installation across Los Altos, CA, where the work is shaped by a specific reality: most homes are 1950s-1970s ranch-style builds still carrying their original single-pane aluminum sliders, sitting on lots now worth north of $3 million. The heat here runs hotter than coastal Palo Alto, so low-e glass is a functional requirement, not an upsell. And because nearly every permitted job triggers Title 24 energy compliance paperwork, you need a company that specs the right glass from the start. Call Westlight Windows & Doors at (903) 354-7134 to talk through your project.
Why Los Altos Homes Are Different
Los Altos is a ranch-house town. The core of the city was built between 1948 and 1975, and the standard window package of that era was a single-pane aluminum slider, usually in a 6-foot or 8-foot rough opening. Six decades later, those frames have corroded, the weatherstripping is gone, and the glass does almost nothing to block summer heat or winter rain. What makes the replacement market here unusual is premium pressure: a vinyl-frame window on a $3.5 million ranch home reads as a value-killer to buyers and realtors, so most Los Altos jobs spec thermally broken aluminum, fiberglass, or wood-clad systems instead. Our teams budget for custom sizing from the outset, because the old pocket-style slider dimensions do not drop cleanly into modern pre-hung unit sizes.
Climate matters too. Los Altos sits far enough inland that summer afternoons during heat events regularly hit the upper 80s to 95°F, meaningfully hotter than Palo Alto or Menlo Park. A window with the wrong SHGC rating turns an afternoon bedroom into an oven. Winter rain reliably exposes failed gaskets and corroded sill tracks, which is when most replacement inquiries spike. And the city’s planning culture, reinforced by neighbor and realtor pressure even where formal design review is not required, means the spec sheet has to be right the first time.
Our Main Los Altos Services
Most Los Altos homeowners reach out for one of three jobs: replacing aging ranch-house windows, installing windows in new teardown/rebuild construction, or upgrading entry and sliding doors. Each service has its own Los Altos page with local pricing and details.
Window Replacement in Los Altos
Replacing original aluminum sliders on a 1960s Los Altos ranch means dealing with two realities: custom rough-opening sizes that rarely match off-the-shelf units, and Title 24 energy compliance documentation on nearly every permitted job. We spec low-e coated glass with the right SHGC rating for Los Altos heat, and we write the price down before any work begins. Owen Satterfield oversees every estimate. Read the full breakdown on our Window Replacement in Los Altos page.
Window Installation in Los Altos
New construction and teardown/rebuild projects in Los Altos lean toward large-format fixed glazing and multi-panel pocket sliders, which require different framing, flashing, and tolerance work than a straight replacement. Our crews handle the install from rough opening to final trim, with background-checked, uniformed technicians on site and a written Kingswell Guarantee handed over at completion. See what is involved on the Window Installation in Los Altos page.
Door Installation in Los Altos
Los Altos ranch homes have a lot of aluminum-framed sliding glass doors that lost their weatherstripping years ago and now stick, leak, or let heat pour in. Newer luxury builds are adding pivot entry doors and wide multi-panel sliders. We install Therma-Tru entry doors, fiberglass systems, and premium sliding door packages, with the written price set before the first screw turns. Details live on the Door Installation in Los Altos 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 Los Altos
We carry and install product from eight manufacturer lines, so the job dictates the brand rather than the brand dictating the job. In Los Altos, the most common specs call for PGT and CGI impact-rated systems, thermally broken CWS frames, and ES Windows for large-format fixed glazing. Local parts availability keeps turnaround tight. See the full lineup on our brands page.
Pricing for Window Company in Los Altos, CA
Every Los Altos homeowner receives a written price before any work starts. The table below gives the typical installed ranges we see across the city’s ranch homes and newer luxury builds.
| Service | Typical range in Los Altos |
|---|---|
| Single window replacement (standard size, aluminum or fiberglass) | $900-$1,800 installed |
| Single window replacement (large-format or custom sizing) | $1,800-$3,400 installed |
| Original aluminum slider replacement (6-ft or 8-ft pocket opening) | $1,400-$2,800 installed |
| Full-home window replacement (typical 3-bed ranch, 12-16 windows) | $16,000-$34,000 installed |
| Low-e glass upgrade (per window, SHGC-rated for inland heat) | $60-$150 added per window |
| Sliding glass door replacement (aluminum frame) | $1,900-$3,600 installed |
| Multi-panel pocket slider (new construction or remodel) | $6,000-$14,000 installed |
| Entry door replacement (fiberglass, Therma-Tru or similar) | $1,700-$4,200 installed |
| Pivot entry door (luxury rebuild segment) | $5,500-$12,000 installed |
| Title 24 energy compliance documentation | $150-$400 per project |
What pushes price up in Los Altos: custom rough-opening sizes on original ranch sliders, thermally broken aluminum or wood-clad systems instead of vinyl, and the Title 24 documentation that accompanies nearly every permitted job. Whatever the final number is, you will have it in writing before we order materials.
Neighborhoods We Serve in Los Altos
We work throughout Los Altos, from the ranch-house streets south of Foothill Expressway to the newer luxury rebuilds along the hills. Typical neighborhoods we cover include:
- North Los Altos (the traditional ranch-home core, heavy original-slider inventory)
- South Los Altos (larger lots, growing teardown/rebuild segment)
- The Country Club area (premium specs, design-review sensitivity)
- Los Altos Hills border zones (large-format glazing and pocket sliders)
- The Loyola neighborhood (split-levels and original aluminum-framed doors)
Response time across the Los Altos service area runs one to two business days for an estimate visit, depending on crew scheduling.
Service Area – Cities Near Los Altos
Westlight Windows & Doors serves Los Altos as its primary hub, with crews also covering nearby Peninsula cities. Homeowners in Mountain View, CA, Stanford, CA, Palo Alto, CA, and Menlo Park, CA reach the same live-person phone line and the same written-price Kingswell Guarantee. Scheduling is coordinated from our San Francisco Bay Area office, with crews dispatched locally.
Serving Los Altos, CA - Our Local Coverage Area
We’re based in the Los Altos 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 Los Altos
Most window and door replacements in Los Altos require a building permit, and nearly every permitted job also triggers California Title 24 energy compliance documentation. We handle the paperwork and spec the right low-e glass to pass compliance. Call (903) 354-7134 to walk through your specific project.
Most estimate visits in Los Altos are scheduled within one to two business days. You will get a written price at that visit, before any work is ordered. Call (903) 354-7134 and a live person answers, 24/7, to set the appointment.
Yes. Our crews work with the original 6-foot and 8-foot pocket-style slider openings constantly, which means we budget for custom sizing from the start and do not assume off-the-shelf units will drop in. The written price reflects that reality. Call (903) 354-7134 for a free estimate.
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 Los Altos 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 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"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