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 Larkspur, CA
Window and door work in Larkspur follows different rules than it does five minutes down the road in Corte Madera or San Rafael. The town’s oldest homes along Magnolia Avenue date to the 1890s resort era, and many still carry original single-pane fir sash that fog, rot, and rattle after a century of canyon moisture. Meanwhile, the hillside streets above Baltimore Canyon sit in a Cal Fire Very High Fire Hazard Severity Zone, which means replacement glazing has to meet Chapter 7A tempered-glass requirements. We’re Westlight Windows & Doors, an independently owned and operated Kingswell location. If you’re pricing windows or doors in Larkspur, call (903) 354-7134 and we’ll walk you through what your specific street actually requires.
Why Larkspur Homes Are Different
Larkspur channels marine fog through the Corte Madera Creek valley nearly year-round. In the canyon neighborhoods, relative humidity stays elevated even in August, which swells wood frames, seizes old hardware, and corrodes aluminum tracks faster than homeowners expect. Original redwood sash on a 1910 Craftsman may look charming from the sidewalk, but open the casing and you’ll often find rot where fog has been sitting against unpainted end grain for generations. Then there’s the fire code. Parcels backing up to Baltimore Canyon Open Space Preserve fall inside the Very High Fire Hazard Severity Zone, and Marin County Building Department enforces California Building Code Chapter 7A. That means exterior glazing must be multi-pane with at least one tempered lite, and exterior doors need fire-assembly ratings. A flatland quote from a contractor who doesn’t know the canyon rules often misses that cost entirely. We don’t, because we write the price down before any work starts and the number accounts for the actual code on your actual parcel.
Our Main Larkspur Services
Most Larkspur homeowners call us about one of three things: replacing fogged or rotted windows, installing new construction windows during a remodel or addition, and swapping out old entry or patio doors. Here’s how each one plays out in this town.
Window Replacement in Larkspur
Replacement in Larkspur usually means pulling out single-pane wood sash from the resort-colony era, or tired aluminum sliders from mid-century hillside builds. On canyon-side streets, the replacement glass almost always needs to be multi-pane tempered to satisfy Chapter 7A. On the flats, it’s more often about stopping air infiltration from the bay winds that funnel through in summer. Every job starts with a written price before work begins, so you know the tempered-glass upgrade is in the number before we touch the first frame. See the full breakdown on our Window Replacement in Larkspur page.
Window Installation in Larkspur
New-construction window installation in Larkspur shows up during additions and full remodels, especially on hillside lots where homeowners are finally addressing single-pane aluminum sliders from the 1960s and 70s. The installation has to be square and flashed correctly the first time, because canyon fog will find any gap and start working on the framing. We install products from eight manufacturer lines, including impact-rated PGT and CGI, so the window matches the exposure and the code zone. Details are on the Window Installation in Larkspur page.
Door Installation in Larkspur
Larkspur entry doors face two pressures: marine moisture that swells and warps wood, and fire-assembly requirements on canyon-side parcels inside the hazard zone. A Therma-Tru entry system holds up better than a raw wood slab in this microclimate, and we install it so the threshold and weatherstripping actually seal against the north winds that come off the bay in fall. Like every Larkspur job, you get a written price and a real arrival window before the work begins. Read specifics on the Door Installation in Larkspur 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 Larkspur
We carry and install eight manufacturer lines, including PGT, CGI, CWS, and ES Windows. Parts for these brands are stocked locally, not ordered blind from a catalog. That keeps turnarounds shorter when you need a sash replaced or a lock adjusted. Compare options on our brands page.
Pricing for Window Company in Larkspur, CA
| Service | Typical range in Larkspur |
|---|---|
| Single window replacement (standard size) | $850 - $1,400 installed |
| Full-frame window replacement | $1,400 - $2,800 installed |
| Wood or fiberglass window install | $1,100 - $2,300 installed |
| Entry door replacement (steel or fiberglass) | $1,600 - $3,400 installed |
| Patio door replacement (sliding or French) | $2,200 - $4,800 installed |
| Interior door install (pre-hung) | $300 - $750 per door |
| Custom window (oversized or architectural) | $1,800 - $4,200 installed |
| Multi-pane tempered glazing upgrade (per window) | $150 - $400 added |
| WUI / Chapter 7A code compliance work | $450 - $1,200 added per opening |
Pricing in Larkspur moves upward when a parcel sits inside the Very High Fire Hazard Severity Zone, because the tempered-glazing and fire-assembly upgrades are real costs that cheap quotes routinely omit until the permit review catches it. Canyon-side access also adds labor when crews have to stage materials on a slope or work around a tight hillside driveway. Whatever the number is, it’s yours in writing before the first screw turns. No door-step revisions, no change orders on a clear scope.
Neighborhoods We Serve in Larkspur
We work across the whole town, from the Old Town corridor along Magnolia Avenue up into the canyon-side streets where the fire code and the fog both come into play. Response times vary by season, but most Larkspur estimates get scheduled within a few days of your call. Neighborhoods we regularly serve include:
- Old Town Larkspur (Magnolia Avenue corridor)
- Baltimore Park
- Palm Hill
- Heather Gardens
- Canyon-side streets near Baltimore Canyon Open Space Preserve
Service Area – Cities Near Larkspur
We serve the Corte Madera Creek valley and the surrounding Marin communities. If you’re on the border or just over the line in Kentfield, CA, Corte Madera, CA, San Rafael, CA, or Mill Valley, CA, the same written-price promise and local crews apply.
Serving Larkspur, CA - Our Local Coverage Area
We’re based in the Larkspur 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 Larkspur
Most Larkspur estimates are scheduled within a few days of your call. Canyon-side streets sometimes add a day or two when we need to plan access. Call (903) 354-7134 and a live person will set the appointment window.
Yes, on parcels inside the Very High Fire Hazard Severity Zone, Marin County enforces Chapter 7A, which requires multi-pane tempered glazing and rated door assemblies. We factor that into the written price before any work starts, so there’s no surprise at permit review. Call (903) 354-7134 for a quote that includes it.
We serve the entire town, from Old Town and Magnolia Avenue up into the Baltimore Canyon hillsides. The terrain changes the access plan, not the guarantee. Every Larkspur job gets a written price, a real arrival window, and the 365-Day Done Right Promise.
For a free estimate on window or door work in Larkspur, call (903) 354-7134. You’ll speak with a real person, get a written price before any work begins, and know exactly what your street requires.
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 Larkspur 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