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AfterFast, Reliable Window Installation Across Larkspur
Window replacement in Larkspur is rarely a simple swap. Baltimore Canyon’s redwood canopy keeps wood frames wet for days after a storm, hillside streets above Magnolia Avenue sit inside California’s Wildland-Urban Interface fire zone, and pre-war homes along the creek valley hold original single-pane sashes that have been failing quietly for decades. The cost of a window installation in Larkspur typically runs $1,200 to $3,800 per opening depending on frame material, glass package, and whether the rough opening needs structural work before new glass goes in. TruePane’s Window Installation team handles the framing rot, the fire-code compliance, and the permit upgrades the same visit we measure. Call (888) 635-0804 for a written quote.
Why TruePane Windows & Doors Is Larkspur’s Preferred Window Installation Company
We have pulled enough rotted sashes out of Larkspur homes to know the real job is almost never behind the glass. It is behind the jamb. Dale Kessler founded TruePane in 2008 on a rule that has not changed: if the pane is not true, the job is not done. That standard carries into every Baltimore Canyon bungalow and every hillside mid-century we open up.
Our technicians are background-checked, uniformed, and working in your home the way they would work in their own mother’s. We measure every opening twice, quote manufacturer lines side by side on paper, and register both warranty layers in writing before the truck leaves the driveway. That is The Keystone Standard. It means you know exactly which manufacturer warranty covers what, for how long, and who to call if something fails. And our Done Right Promise sits on top of all of it. If the install is not right, we make it right. No paperwork fight, no arguing.
A live person answers our phone 24 hours a day. Not a voicemail tree, not a callback form. When a Larkspur homeowner calls about a failed seal or a binding casement, a person picks up and knows the area well enough to ask the right question: “Is the house in the canyon, or up on the hill?” Because that answer changes the job.
Our Window Installation Services in Larkspur
Casement Windows
Casement windows crank outward on side hinges, and they seal tighter than double-hungs because the sash presses against the frame when closed. In Larkspur’s fog belt, that matters. Homes along the Corte Madera Creek valley get steady marine moisture from June through August, and a casement’s compression seal holds up better against damp air than a sliding sash that weatherstripping has to drag against. We install fusion-welded vinyl, fiberglass, and wood casements with multi-point locking hardware, sized to the often non-standard rough openings found in the Craftsman bungalows near Magnolia Avenue.
Double Hung Windows
Double-hungs are what most of Larkspur’s original houses were built with: two sashes that slide vertically. The problem in this climate is that both sashes sit in tracks that trap fog moisture, swell the wood, and eventually bind the sashes shut by July. We see it constantly in the Victorian cottages and Colonial Revivals within ZIP code 94939. Replacement double-hungs with tilt-in sashes and low-E glass cost $1,400 to $3,200 per opening in Larkspur, and that assumes the rough opening is sound. In Baltimore Canyon it often is not.
Bay and Bow Windows
Bay and bow windows cantilever out from the wall, which means they need a proper structural seat and flashing detail. On older Larkspur homes, we frequently find the cantilever framing has been soaking up fog moisture for fifty years. The sill plate under a bay window near Corte Madera Creek sees condensation cycles every single morning. Replacing a bay or bow unit properly means addressing the support framing, the roof cap flashing, and the interior trim all at once. TruePane has done this work on hillside homes where the bay window is the primary daylight source in the living room and where a substitute frame material would not pass WUI inspection.
Fixed and Picture Windows
Fixed windows do not open, which sounds simple until you are talking about a large picture unit in a Larkspur living room with redwood canyon views. Large fixed glass needs structural headers, proper weight distribution, and glass that meets California’s solar heat gain requirements for the WUI zone. We size fixed windows to the view, not just the opening. On a home above downtown Larkspur, that often means specifying fire-rated glass that meets state code while keeping the sightlines clean.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Larkspur
TruePane is an authorized installer for more than a dozen manufacturer lines, including. We quote brands side by side on paper so you can see exactly where the dollars go. For Larkspur’s WUI-designated hillside neighborhoods, we frequently specify PGT and CGI impact-rated lines that meet fire and wind requirements without sacrificing a clean facade. For canyon homes under redwood canopy, we pull from the Milgard and ES Windows catalogs for low-E argon-filled units that keep condensation at bay. Parts and service for these brands are stocked for our Marin County routes, so a follow-up trim or a warranty replacement does not leave a Larkspur homeowner waiting on a distributor.
Common Window Installation Problems We See in Larkspur Homes
- Rotted rough sills behind intact sashes. Fog-driven moisture in Baltimore Canyon seeps behind the exterior trim and rots the rough sill plate while the sash itself still looks fine. We pull the old window and find the structural wood is gone. That reframe adds real cost, and we price it in writing before we cut anything.
- Failed insulated glass seals from condensation cycles. Older double-pane units in Larkspur lose their argon fill and U-factor performance from years of morning marine fog followed by afternoon sun. You may not see fog between the panes, but the glass is not insulating the way it should. We test and spec replacements accordingly.
- WUI fire-code violations on hillside homes. Homes above downtown Larkspur inside the Wildland-Urban Interface zone need fire-rated glazing and non-combustible frames when a permit is pulled. Many original single-pane wood windows do not pass. Replacing them triggers the upgrade, and we handle the compliance as part of the job.
- Non-standard rough openings in pre-war homes. The Craftsman bungalows and Victorian cottages near Magnolia Avenue rarely have standard 2-by-4 framing dimensions we see in newer construction. Custom sizing and careful trim profile matching are not optional. We measure every opening twice and order to the sixteenth of an inch.
Pricing for Window Installation in Larkspur, CA
Window installation in Larkspur runs higher than flatland Marin cities because the housing stock is older and the compliance layer is heavier. Here are honest ranges for this market:
- Standard replacement double-hung, vinyl, no structural repair: $1,400 to $2,600 per opening
- Casement window in fiberglass or fusion-welded vinyl, standard rough opening: $1,600 to $3,000 per opening
- Bay or bow window with structural support repair: $4,500 to $9,800 per unit
- Fire-rated or impact-rated window required by WUI code: add $700 to $2,200 per opening over standard glass
- Structural framing repair due to hidden rot (common in Baltimore Canyon): $450 to $1,800 per opening, priced in writing before work starts
These ranges reflect what we see in 2025 and 2026 across Larkspur. Grading and access on hillside lots adds labor. A second-story window on a steep hillside street requires staging or fall protection that adds $300 to $900. Every TruePane quote is a line-item, fixed number. We do not change the price after we open the wall unless you approve the change order in writing first. Estimates are free. Call (888) 635-0804.
We Also Serve Cities Near Larkspur
Our crews install and replace windows throughout central Marin, so if you live in Window Installation in Larkspur or just across the line in Kentfield, Corte Madera, San Rafael, or Mill Valley, the same team and the same promise apply. We schedule routes through these towns daily, which means a measurement visit or a warranty follow-up does not leave you waiting a week.
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 - Window Installation in Larkspur
The old-growth redwood canopy over Baltimore Canyon blocks direct sun so completely that exterior wood window frames stay wet for days after a storm. A sash can look fine from the outside while the king studs and rough sill plate behind it have been wicking moisture for decades and are punky to the touch. When we pull the old jamb, we commonly find the structural wood that holds the window is gone. Replacing that framing with pressure-treated lumber and proper flashing is the correct fix, not an upsell. Expect $450 to $1,800 per opening when rot is found. Call (888) 635-0804 and we will inspect before we quote so you know what you are buying.
Yes. Homes in the WUI-designated hillside neighborhoods above downtown Larkspur must now meet fire-rated glazing and non-combustible frame requirements under state code when a window permit is pulled. A standard single-pane wood window will not pass. We install fire-rated and impact-rated units from manufacturers like PGT and CGI that meet the code requirement and still look appropriate on an older Larkspur home. Call (888) 635-0804 for a WUI-compliance check on your specific address.
The quick check: if you see fog or condensation between the two panes that you cannot wipe away, the seal has failed. But in Larkspur’s marine fog climate, seals also fail invisibly. The argon gas leaks out and the window loses its insulating value even without visible fog. Telltale signs are drafts near the sash in winter and a chill you can feel from three feet away. We test failed units with an infrared meter and quote replacements at the same visit. Call (888) 635-0804 to schedule a check.
Hidden structural rot. A contractor quotes a window swap based on what he can see. Then the old jamb comes out and the rough sill plate is gone, or the king studs are soft from decades of canyon moisture. In Baltimore Canyon this happens often enough that we build a rot allowance into our written quote so you know what a worst-case framing repair costs before we start. If we do not spend it, we do not charge it. Any structural work beyond the allowance gets priced and approved in writing before we cut a stud. Call (888) 635-0804 for a quote that accounts for what we might actually find.
Yes. The Craftsman bungalows and Victorian cottages along Magnolia Avenue and the surrounding streets have specific trim profiles, casing widths, and sill details that a modern off-the-shelf window will not match. We custom-order sashes and mill matching trim so the new window sits in the opening the way the original did. On a recent Baltimore Canyon Craftsman, we trimmed a replacement Milgard casement to match the original redwood profile exactly. Your streetscape character is part of the house’s value, and we treat it that way. Call (888) 635-0804 to talk through your specific trim profile.
TruePane Windows & Doors serves Larkspur from our San Francisco Bay Area office with local crews who know the canyon, the hills, and the creek valley. We answer the phone 24 hours a day. We stand behind every job with the Done Right Promise and The Keystone Standard. We will be there when we say. Call (888) 635-0804 to schedule your free estimate.
Written by Dale Kessler, Owner at TruePane Windows & Doors, serving Larkspur and Marin County through years of glazing craft and community commitment.