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Get your free estimateCGI Windows & Doors in San Francisco, CA | Lightwell Windows San Francisco
We provide independent CGI windows and doors service across San Francisco, from the Sunset to Russian Hill and everywhere between. What makes our CGI work different here is simple: we know how fog and salt air work on aluminum and vinyl frames, and we read the building before touching a single panel. CGI sales & service is a core part of what we do, and we have been doing it in this city long enough to know which balances seize in the Richmond District and which tracks collect silt in the Mission. If you have a CGI window that will not open, a door that drags, or hardware that feels rough after a marine-layer season, call us at (831) 480-4124 and we will tell you what we are seeing. We are independent, which means our recommendation is based on the frame in front of us, not a factory script.
Why San Francisco Residents Choose Us for CGI Service
Most window companies in San Francisco will sell you a replacement. We will show you whether the window actually needs one. Keith Yamada, owner of Lightwell Windows San Francisco, grew up helping his father weatherstrip a 1960s ranch house in the San Gabriel Valley, and he still checks every corner twice before calling a frame done. His crew has worked on Victorians in Noe Valley, Edwardians in the Marina, and a lot of 1930s stucco in the Sunset. That range matters because CGI products fail differently in each of those buildings. We stock common CGI OEM balances, rollers, hinges, and weatherstripping when available, and when a part is discontinued or backordered, we source aftermarket equivalents that match the original profile and finish. The result is a repair that looks original and works like it should.
We are not manufacturer-affiliated or factory-authorized. Some homeowners hear that and wonder if we are the right call. We would rather you know it upfront, because it is the reason our repair-versus-replace advice stays honest. We repair first when the frame and glass are sound, especially on historic buildings where original millwork is part of the home’s value. And every job comes with a written price before any work starts, so you know what the number is before we unload the truck.
Styles & brands we work with
Common CGI Windows & Doors Problems We Solve in San Francisco
- Corroded CGI Estate Collection aluminum frames near the coast. In the Sunset and Richmond districts, the marine layer does not just fog your view; it leaves a fine salt film on exterior aluminum. Over years, that becomes pitting and corrosion at the corners, and windows start to bind when you operate them. We clean, treat, and reseal those frames, and replace corner keys and gaskets when they have failed.
- Hard-to-raise or sudden-dropping single-hung and double-hung vinyl sashes. CGI’s vinyl single-hung windows use block-and-tackle balance assemblies that do not love persistent moisture. We see rusted or seized balances all over San Francisco, from Outer Sunset to Bernal Heights. The sash gets harder to lift, then one day it drops or refuses to stay open. We replace those balances with OEM or exact-fit aftermarket units and set the tension correctly.
- Binding horizontal roller windows and 3-panel sliders in older stucco homes. Salt grit works its way into the bottom track, and the original nylon rollers flatten or corrode. The panel drags, grinds, or comes off track entirely. We clean the track, replace the rollers, and realign the panel so it glides without dragging.
- Worn casement hardware on original CGI windows in Edwardian homes. Hinge arms loosen, gaskets crack, and the sash starts letting in drafts and condensation. On a wood-framed Edwardian, that condensation sits against the sill and accelerates rot. We replace hinge arms, install fresh weatherstripping, and address any sill damage before it spreads.
- Failed exterior seals and moisture intrusion on impact-rated windows. San Francisco’s cool, wet winters test exterior seals constantly. When a seal fails on a Sentinel Series impact window, you see fogging between panes or water staining below the frame. We deglaze, clean, and reseal the unit, or swap the insulated glass when the seal has failed inside the glazing pocket.
CGI Service in San Francisco: What Local Conditions Mean for Your Equipment
Here is something you will not read on a national CGI page. In San Francisco’s Sunset and Richmond districts, many 1930s stucco homes still have original steel casement windows. They get mistaken for CGI products constantly, because the narrow frames and squared profiles look similar. But when we handle our Window Replacement in San Francisco for those homes with actual CGI replacement windows, the real work is in matching the narrow frame depth and custom sill profile to preserve the Art Deco setback while meeting current egress rules. That spec is not something you find in Oakland or Daly City, and it is why a CGI install in a Sunset home is not a drop-in job. The exterior stucco has to stay undisturbed, the interior trim needs to meet the new frame without awkward gaps, and the sill profile has to echo what was there in 1938. We have done enough of these to know what the plans department wants to see, and what the house needs.
One job comes to mind from 42nd Avenue in the Sunset. The owner could no longer open her CGI Estate Collection horizontal roller window because salt corrosion had seized the original steel-clad track and flattened the nylon rollers. The sash sat a full eighth of an inch proud of the frame. We removed the window, braced the opening, replaced the roller carts with stainless aftermarket units, and milled a new marine-grade aluminum track to match the CGI extrusion. Then we reset the sash and sealed the exterior with a neutral-cure silicone. That window now passes a blower-door test at the rough opening, which is a better outcome than a quick parts swap would have given her.
CGI Models & Products We Service in San Francisco
We work on the CGI Estate Collection Aluminum Windows, Estate Collection Vinyl Windows, Sentinel Series Impact Windows, and Commercial Grade Aluminum Storefront and Window Wall systems. If your building has a CGI product from a line that has since been renamed or discontinued, we can usually identify it and source parts that fit. For discontinued or hard-to-source pieces, we use quality aftermarket equivalents matched to the original profile and finish, which keeps repair timelines reasonable in San Francisco instead of waiting on a backorder. We stock common balances, rollers, hinges, and weatherstripping for the most common CGI configurations in this city.
See the difference
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AfterCGI Service Pricing in San Francisco
CGI window service in San Francisco typically runs between $180 and $680 per opening depending on the repair. A single balance replacement on a vinyl double-hung might be $190 to $260. A full roller and track replacement on a horizontal roller window might run $320 to $480. A full-frame replacement for a historic CGI retrofit, with custom millwork to match the original profile, often lands between $1,400 and $2,800 per opening. What moves the number is access, condition of the frame, whether custom millwork is required, and whether the building sits in a historic review district. A written estimate is always free, and the price we quote is the price you see on the invoice. Call (831) 480-4124 and we will come out and put it in writing.
Serving San Francisco, CA - Our Local Coverage Area
We’re based in the San Francisco 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 – CGI Windows & Doors in San Francisco
In many cases, yes. If the frame extrusion itself is structurally sound, we can replace the balances, hinges, rollers, and weatherstripping while keeping the original frame in place. This matters in historic San Francisco buildings where preserving original millwork and sightlines is part of the home’s value. If the frame is corroded to the point of pitting or the corner seals have failed, replacement is the honest choice.
Yes, and we stock marine-grade and high-compression weatherstripping for exactly that reason. Traditional foam or felt weatherstripping breaks down faster in San Francisco’s persistent moisture and salt air, especially on west-facing elevations. We use materials that hold their shape and seal under repeated moisture cycles, which reduces drafts and condensation at the sill.
Yes, we can, and this is one of the more delicate jobs we do in this part of San Francisco. The approach depends on the existing opening dimensions and condition. We often handle our Window Installation in San Francisco with a narrow-profile CGI replacement window that matches the original frame depth and sill profile, so the exterior stucco stays intact and the Art Deco setback remains. Call (831) 480-4124 to have us measure and give you a straight answer on your specific building.
The block-and-tackle balance assemblies inside the side jambs have failed, usually from corrosion caused by San Francisco’s persistent marine moisture. The sash loses tension and drops or stays hard to lift. We replace the balances and set the tension for the actual sash weight, which restores smooth operation and prevents the drop.
It depends on whether your building is a designated landmark or sits within a historic district, and whether the facade change is visible from the street. Same-size replacements that preserve sightlines and profiles often qualify as in-kind work, but every project is different. We can advise you on the review path and, when necessary, prepare detailed drawings that show the preservation office what we are keeping and why. Call (831) 480-4124 for a free consultation on your building’s specific situation.
Service Areas Near San Francisco
We serve San Francisco and nearby communities across the Bay. If you own a CGI-equipped home in San Francisco service area neighborhoods like the Sunset, Richmond, Noe Valley, or the Marina, we are nearby. We also CGI service in Castro Valley and CGI service in Danville for homeowners east of the hills who need the same careful repair work. Berkeley, San Leandro, and Walnut Creek are within our regular range as well.
Book Your CGI Service in San Francisco Today
If you have a CGI window or door that is binding, leaking, or refusing to open, call (831) 480-4124. We will schedule a free estimate, put the price in writing before any work begins, and treat your home the way we treat our own. “Measure it until it’s boring, then cut once.”
Written by Keith Yamada, Owner at Lightwell Windows San Francisco, serving San Francisco since 2010.
Six Reasons Homeowners Choose Lightwell Windows San Francisco
Laminated glass and reinforced frames hold up to wind-driven rain, hail and flying debris, so your openings stay sealed when the weather turns.
Low-E insulated impact glass from our manufacturer lines commonly cuts monthly cooling bills 20-30%.
Laminated impact glass shuts out up to 40% of outside noise - traffic, neighbors, weather.
Monitoring services run $30-90 a month. Laminated impact glass resists forced entry around the clock, with no subscription.
Tighter seals and insulated glass even out hot and cold rooms and stop the drafts at the frame.
A full impact package upgrades curb appeal, buyer confidence and appraised value in one project.