Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
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AfterFast, Reliable Window Replacement Across Fairfax
Window replacement in Fairfax runs between $850 and $2,900 per opening for most homes, with the final number set by frame condition, glass type, and whether the opening is standard or trimmed to fit. Our crews know the canyon lots, the fog-dampened north and west walls, and the CAL FIRE requirements that shape every job in town. Call (562) 478-8017 for a written, fixed price before anything is ordered.
Fairfax is not a simple swap-out town. The hillside bungalows off Bolinas Road, the flat-roofed 1940s cottages near Peri Park, and the steep driveways climbing toward Cascade Canyon all hold non-standard rough openings and decades of trapped moisture. We write your price before we order glass, we show up with shoe covers and drop cloths, and we leave with a photo of the cleanup. That is how every Fairfax job goes.
If you live in Fairfax, you are already inside the Very High Fire Hazard Severity Zone mapped by CAL FIRE. That means your replacement windows must meet ember-resistant assembly standards. But you are also sitting in a bowl-shaped valley that traps fog from the coastal hills, which is why original wood sashes on 1920s and 1950s homes rot far faster than they would in San Rafael’s sunny flats. We plan for both constraints on the same job.
Why Lightwell Windows & Doors Is Fairfax’s Preferred Window Replacement Company
Lightwell Windows & Doors is an independently owned Cedarwell location, part of the Cedarwell network since 2010. Led by Keith Yamada, our Window Replacement team carries eight manufacturer brands, including PGT, CGI, and ES Windows, so the recommendation fits your home, not a single vendor’s inventory. We operate to the Cedarwell Care Promise, and every job carries the 365-Day Done Right Promise: if the finished work is not right, we make it right, no debate and no countdown.
Our technicians are background-checked, uniformed, and trained to the C.A.R.E. values on every visit. Clean up like it is our own home. Ask before we move or touch anything. Respect your family’s time and quiet hours. Explain the price before the work starts. Those four letters show up as shoe covers at the door, drop cloths under every window, quiet tools during nap time, and pet-safe caulk and sealants wherever a choice exists. A light well is what brings daylight deep into a building. That is what a well-installed window should do for your Fairfax home.
When something goes wrong with a new install, a live person answers the phone 24/7 at (562) 478-8017. No voicemail maze. That is not a marketing line. It is how we have always run the Fairfax schedule.
Window Replacement Company in Fairfax
A Window Replacement Company in Fairfax handles the full removal of an old sash, frame, and trim, then sets a new unit engineered for the specific opening, the elevation’s exposure, and CAL FIRE’s ember-resistant standards. Most full-frame replacements on Fairfax bungalows run $1,800 to $2,900 per opening because non-standard rough openings and out-of-square hillside frames nearly always require trimmed-to-fit or custom sizing. Insert replacements, where the existing frame is sound and only the sash and hardware come out, run $850 to $1,400 per opening.
The job usually begins with a moisture check on the king studs and rough sill. On shaded canyon-side streets off Bolinas Road, we routinely find framing that has wicked damp for decades and is no longer structural. When that happens, the framing repair is added to the written price before any new glass is ordered.
Full Frame vs. Insert Replacement
Full frame replacement removes everything down to the rough opening. It is the right call when the original wood frame is soft, out of square, or no longer meets fire-code detailing. Insert replacement keeps the existing frame and fits a new unit inside it. We recommend inserts only when the frame is dry, square, and structurally sound after inspection.
Energy-Efficient Upgrades for Fairfax Homes
Fairfax homes lose heat through single-pane wood sashes all winter, then trap damp air all summer. A dual-pane tempered low-E unit solves both. We pair the glass with proper sill slope and pan flashing so the new window does not become another moisture problem on the north elevation.
Window Glass Replacement in Fairfax
Window Glass Replacement in Fairfax swaps the damaged pane rather than the whole frame or sash. A fogged or cracked dual-pane unit on a Fairfax home runs $350 to $800 per pane when the frame is sound and the sash can be reglazed. If the glass is on a fire-rated assembly, the replacement pane must be tempered and the vent screening must stay at 1/16 inch to remain CAL FIRE compliant, which is a detail big-box installers miss.
We handle glass replacement as its own job, not a discounted add-on. The work involves removing the failed insulated glass unit, resetting it in new glazing bead, and re-sealing the sash with a pet-safe silicone sealant. On north- and west-facing elevations that see months of fog, we also inspect the sill slope and weep system while the glass is out.
Fogged Double-Pane Glass on Older Fairfax Homes
When a dual-pane unit fails, moisture gets between the panes and the glass fogs permanently. On older Fairfax sashes, the failure often starts at the bottom seal, where trapped condensation sits for months. Replacing just the glass unit, not the whole window, makes sense when the frame and sash are still square and dry.
Glass for Fire-Rated Fairfax Assemblies
If your home sits inside a mapped Very High Fire Hazard Severity Zone, which includes most of Fairfax, replacement glass must carry the tempering and ember-screen requirements written into the zone’s assembly standards. We verify the designation before ordering any pane so you are not paying twice for non-compliant glass.
Trusted Brands We Service in Fairfax
We stock and service windows and doors from PGT, CGI, and ES Windows, along with five other manufacturers, so Fairfax homeowners are not shoehorned into whatever one installer prefers. PGT’s impact-rated units work well for fire-zone and hillside applications. CGI’s casements hold up on the damp north elevations. ES Windows gives us the architectural glass and specialty finish options that designer-driven Fairfax remodels ask for. Because we draw from eight brands, we can match an existing sightline on a 1940s craftsman or spec a full custom unit for a new build above Cascade Canyon without waiting on a single vendor’s lead time.
For Window Replacement in Fairfax, brand selection comes after we see the opening and the elevation, never before.
Common Window Replacement Problems We See in Fairfax Homes
- Rotted king studs and rough sills behind failed sashes. The fog-trapped moisture on shaded canyon lots wicks into framing for decades. We sister in new lumber, set the opening square, and only then order the glass.
- Off-the-shelf units that never fit the opening. Hillside foundations settle and twist frames out of square. A stock unit from a home center leaves gaps we have to hide with trim. Custom or trimmed-to-fit orders solve it.
- Non-compliant ember-resistant assemblies. Skipping the 1/16-inch screened vents, dual-pane tempered glass, or fire-rated frames makes the window illegal for the zone. We and anyone else working in Fairfax must build to that standard.
- Under-detailed flashing on north and west walls. Fairfax gets more than 40 inches of rain in a normal year, and the north elevations stay damp for months. Without proper pan flashing, sill slope, and vapor-barrier detailing, a new window rots just like the old one.
Pricing for Window Replacement in Fairfax, CA
A straightforward insert replacement in Fairfax runs $850 to $1,400 per opening. Full frame replacement runs $1,800 to $2,900 per opening, and that higher number is normal here because the framing behind old sashes is usually wet. Glass-only replacement runs $350 to $800 per pane. Custom architectural work with specialty finishes from ES Windows or impact-rated PGT units pushes above $3,000 per opening, and the schedule is set by manufacturer lead times, not labor.
What changes the price in Fairfax: whether the rough opening is square, whether the framing behind the sash is structurally sound, whether the elevation faces the fog, and whether the assembly must meet fire-zone glass standards. We put the number in writing before ordering anything, and that number does not change unless you change the scope. Call (562) 478-8017 for an exact figure. Estimates are free.
We Also Serve Cities Near Fairfax
Beyond Fairfax, our crews work in San Anselmo, Kentfield, San Rafael, and Larkspur. Each town has its own moisture and fire-zone patterns, so we never copy a Fairfax spec onto a San Anselmo hillside without walking the elevation first. If you are in a neighboring town, call (562) 478-8017 and we will bring the same written-price rule with us.
Serving Fairfax, CA - Our Local Coverage Area
We’re based in the Fairfax 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 Replacement in Fairfax
Fairfax sits inside CAL FIRE’s Very High Fire Hazard Severity Zone, so replacement assemblies must be ember-resistant, with dual-pane tempered glass, 1/16-inch screened vents, and fire-rated frames. That constraint applies in Fairfax and does not apply uniformly in San Anselmo or in the sunny flats of San Rafael. The town’s bowl-shaped valley also traps fog against north and west elevations, which accelerates rot in original wood sashes far more than in open, windier Marin communities. Call (562) 478-8017 and we will check your zone and your elevation before quoting.
Off-the-shelf units fail on Fairfax hillside cottages because the rough openings were framed by hand in the 1920s through 1950s and have settled out of square on steep foundations. A stock unit leaves gaps that get hidden with trim, and the gap becomes a moisture path. We measure every opening, check for square, and order trimmed-to-fit or custom units when the frame is off. The written quote reflects that before you pay anything.
Our crew typically finds king studs and rough sills that have wicked moisture for decades and are no longer structural. On a shaded canyon-side street off Bolinas Road, we once pulled a failed double-hung from a 1940s craftsman and found exactly that, so we sistered in new framing and set a custom-trimmed PGT casement with dual-pane tempered low-E glass and a 1/16-inch screened vent before the new jamb could go in. We fixed that same-day framing repair in writing before ordering. Call (562) 478-8017 for an inspection and a fixed number.
Fairfax’s north and west elevations sit in trapped fog for months, and the town gets more than 40 inches of rain a year. Pan flashing, sill slope, and vapor-barrier detailing must be installed to drain water away from the framing, or the new window rots like the old one. We detail every north- and west-facing install to that standard and document the flashing before the trim goes on.
We fix the price in writing before any long-lead custom units are ordered. On a high-end Fairfax job with architectural glass or specialty finishes from ES Windows, the calendar is set by manufacturer lead times, not labor, and that is exactly why the number is locked early. You will not get a larger invoice at the end because a supplier moved a date. Call (562) 478-8017 to get your written figure.
Get Your Written Fairfax Window Replacement Estimate
You should not have to guess what a Fairfax window replacement will cost, and you should not have to watch a crew leave dust and scraps behind. We put every price in writing before ordering glass, we show up with shoe covers and drop cloths, and we leave with a photo of the cleanup. Call (562) 478-8017 to schedule your free estimate with Keith Yamada and the Lightwell Windows & Doors team serving Fairfax.
Written by Keith Yamada, Owner at Lightwell Windows & Doors, serving Fairfax since 2010.