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 Belmont, CA
Westlight Windows & Doors is a window company in Belmont, CA that replaces and installs windows and doors in the hillside homes that define this city. Belmont’s 1950s-to-1970s houses were built with large aluminum-framed windows meant to capture bay views, and most of those frames are now corroded, leaky, and fighting the marine fog that rolls over the western ridge. If your Belmont home still has its original single-pane aluminum windows, you’re likely dealing with condensation, drafts, and seals that failed years ago. Call (903) 354-7134 for a written, upfront price before any work begins.
Why Belmont Homes Are Different
Belmont is not a generic Peninsula suburb. Most detached homes sit on sloped lots along the western ridge, where the marine fog layer arrives from the Pacific and settles in overnight, leaving window seals and door thresholds wet far more often than what flatland homes in San Mateo or Redwood City experience. That cyclical moisture is what kills aluminum frames, which were never designed to handle decades of coastal humidity cycling. Homeowners in the hillside neighborhoods – Sterling Downs, Hallmark, Belburn, and the terraced streets above Ralston Avenue – routinely find track-level rot on sliding patio doors and wood-frame rot around window openings, because fog condensation gets into the rough opening and never fully dries.
Belmont’s housing stock makes this problem worse. Homes built between the 1950s and early 1970s were framed with wide window openings to maximize bay views, and those openings were fitted with aluminum single-pane units that are now decades past their service life. When those units come out, the rough opening often needs re-shimming and reframing before a modern dual-pane window can sit plumb – especially on homes with terraced lots where gradual settlement has knocked the framing out of square. Flat-lot Peninsula jobs rarely need that step; Belmont hillside jobs often do.
We plan for it on every estimate. You’ll see it in writing before the job starts.
Our Main Belmont Services
Homeowners in Belmont call us about two things more than anything else: replacing the original aluminum windows that are failing against the fog, and installing new doors where the old sliders or entries have rotted out. Each service has its own Belmont page with pricing and process details.
Window Replacement in Belmont
Belmont’s original aluminum windows are at the point where seal failure and frame corrosion aren’t repairable – they’re end-of-life. Replacing them in a hillside home means pulling the old unit, correcting the rough opening, and installing a dual-pane window that actually meets Title 24 Climate Zone 3 requirements for U-factor and SHGC. We carry eight manufacturer lines, so the replacement matches the home rather than the reverse. Read the full breakdown at Window Replacement in Belmont.
Window Installation in Belmont
New window installation in Belmont usually accompanies a remodel, an addition, or replacing a failed unit with a different style or size. On hillside lots, the rough opening work is the part that separates a clean install from a window that binds within a year. We shim, level, and seal the opening before the new unit goes in, and we put the installation details in writing before work starts. See the full scope at Window Installation in Belmont.
Door Installation in Belmont
Many 1960s and 1970s Belmont homes still have original sliding aluminum patio doors, and those doors are a weak point. Fog moisture condenses on the track, wicks into the framing, and rots the wood before the homeowner sees any visible damage on the inside. A new door installation in Belmont often means rebuilding the rough opening, shimming it square, and then hanging the door – a step flat-lot jobs rarely need. Details are at Door Installation in Belmont.
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 Belmont
We install from eight manufacturer lines, and for Belmont jobs we often draw from CGI, ECO Window Systems, and CWS. CGI’s impact-rated windows hold up well against wind-driven fog and winter storms on exposed ridge lots. ECO’s dual-pane glass handles the condensation cycle better than the original aluminum. See our brands for the full list and what each line is best suited to.
Pricing for Window Company in Belmont, CA
| Service | Typical range in Belmont |
|---|---|
| Single-window replacement, standard size | $800-$1,400 installed |
| Window replacement, mid-size (36″×48″ to 48″×60″) | $1,200-$2,200 installed |
| Large picture window or bay-view window replacement | $2,500-$5,500 installed |
| Full-home window replacement, 8-12 windows | $9,000-$24,000 installed |
| New construction window installation, per opening | $600-$1,200 plus window cost |
| Sliding patio door replacement, 6-foot unit | $2,000-$4,500 installed |
| Entry door replacement, standard 36″×80″ | $1,800-$4,200 installed |
| Custom door installation with sidelites or transom | $3,500-$7,500 installed |
| Rough opening repair or reframing (per opening) | $300-$900 |
| Full removal of old unit, disposal, and haul-away | $100-$250 per opening |
In Belmont, the big price movers are terrain and framing. A window on a flat lot with a clean rough opening is straightforward; a window terraced into a slope with a racked opening and water damage costs more because the framing work has to happen first. Every Belmont estimate is a written, line-item price given before work starts – not a range that gets revised at the door.
Neighborhoods We Serve in Belmont
We work across Belmont, from the hillside streets above Ralston Avenue down through the flats near El Camino. Each area has its own mix of original aluminum windows, failing sliders, and second-generation replacements, and our Belmont crews schedule by neighborhood to keep response times predictable.
- Sterling Downs
- Hallmark
- Belburn
- Carlmont area
- Hillside terraces above Ralston
Service Area – Cities Near Belmont
Most Belmont homeowners come to us from the Peninsula, and we regularly work in the neighboring cities where the fog line and housing stock are similar. Our crews serve San Carlos, CA to the south, San Mateo, CA to the east, Redwood City, CA across the 101 corridor, and Burlingame, CA to the north. Dispatch is coordinated from our Bay Area office, with local crews scheduled for Belmont work.
Serving Belmont, CA - Our Local Coverage Area
We’re based in the Belmont 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 Belmont
Belmont requires building permits for window and door replacement when the opening changes size or the structural framing is altered. Like-for-like replacement of the same size typically falls under a simpler path, but we confirm permit requirements as part of every written estimate. We pull the permits and schedule the inspections so you don’t have to. Call (903) 354-7134 and we’ll check your specific situation.
Most single-window replacements take half a day. A full-home replacement of ten to twelve windows usually runs three to five working days, depending on terrain and how much rough opening repair the fog damage requires. We give a committed arrival window in writing before the job starts, and we don’t revise it unless weather forces a delay. Call (903) 354-7134 for a schedule based on your home.
Yes. Some Belmont hillside neighborhoods have HOA restrictions on visible window styles or exterior finishes. We check the governing documents before ordering product, and we’ll match the required style or materials so the job doesn’t stall at architectural review. Bring us the HOA documents with your estimate request and we’ll handle the rest. Call (903) 354-7134.
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 Belmont 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