Sliding glass doors
Single hung
Double hung
Horizontal roller
Casement
Bay & bow
Entry doors
Impact garage doors
PGT
CGIFree in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
Get your free estimateWhy San Francisco Homeowners Choose CGI Windows & Doors
We provide independent CGI in San Francisco for windows and doors repair, service, and installation, handling everything from fogged insulated glass on Estate Collection double hungs to salt-corroded roller tracks on 950 Series sliders. Our crews have worked on CGI products in nearly every San Francisco neighborhood, which means we know which series fail from marine-layer moisture, which warp under direct southern sun, and which hold up fine for decades. We are not authorized by or affiliated with CGI, but that independence lets us recommend the repair that actually fits your home rather than the replacement that fits a manufacturer’s sales target. Call (831) 480-4124 for a free estimate on any CGI window or door.
Why Trust Lightwell Windows San Francisco for Your CGI Windows & Doors?
CGI products are specific. A Sentinel Series impact casement has different hardware, balance systems, and glazing tolerances than an Estate Collection double hung, and a 950 Series slider is a different animal entirely. Our technicians know these differences because we have taken apart and rebuilt all of them. Keith Yamada, owner of Lightwell Windows San Francisco, spent years reading existing frames before a single panel comes off the wall, so a repair starts with understanding what CGI intended when the unit left the factory. That matters when a homeowner asks whether we can save a fogged sash or whether the whole frame needs to go. We carry genuine CGI hardware and balances for direct-match repairs, and we source high-quality aftermarket weatherstripping and glazing beads where the original spec does not call for a proprietary part. Warranty-safe practice is the rule: we never modify a frame in a way that would void a remaining CGI warranty, and we tell you before we touch anything whether a repair or a replacement is the honest answer.
Styles & brands we work with
Common CGI Windows & Doors Problems We Fix in San Francisco
- Fogged or hazed glass on Estate Collection and Sentinel Series units. Thermal cycling near the bay stresses insulated glass seals until they fail, letting moisture in between the panes. The glass looks streaked from inside no matter how much you clean it. This is almost always a failed seal, not a dirty window, and the fix is a matching insulated glass unit rather than a whole new frame.
- Stiff or jammed roller tracks on 950 Series sliding glass doors. Salt air from the ocean and bay corrodes the aluminum track inserts and the roller wheels themselves. The door starts to grind, then sticks, then refuses to move without real force. We pull the panel, clean or replace the track inserts, and install new rollers matched to the 950 Series spec so the door glides like it did when it was installed.
- Warped or misaligned sashes on Classic Series horizontal roller windows. Direct sun on south-facing San Francisco exposures, especially in neighborhoods like Bernal Heights or the Mission, heats vinyl sashes unevenly. Over years the sash bows slightly and stops closing flush against the frame. Sometimes we can re-align the sash and replace the weatherstripping; if the vinyl itself has warped beyond tolerance, a replacement sash or full unit is the better call.
- Cracked or brittle vinyl glazing beads on older Estate windows. UV exposure makes the vinyl glazing bead brittle over time. When a glass unit needs re-glazing, the old bead often snaps instead of releasing cleanly. We keep replacement beads in stock and route out the old material carefully so the frame itself stays intact. It is tedious work, but it spares the frame and keeps the repair cost down.
- Fogged Sentinel Series picture windows with intact frames. Fixed picture windows rarely fail at the frame, but the large glass area puts more stress on the insulated seal, especially on foggy western exposures in the Sunset and Richmond. If the frame is sound, we replace the glass unit only, which costs far less than a full window replacement and keeps your original sightlines.
CGI Parts & Our Repair-vs-Replace Approach
CGI hardware has specific tolerances, so when a lock, roller, or balance on a Sentinel or 950 Series unit needs a direct match, we use genuine CGI parts. For non-proprietary items like weatherstripping, glazing beads, and window screens, we stock high-quality aftermarket components that meet or exceed the original specification and often cost less without cutting corners. The decision between repair and replacement comes down to structure. A failed insulated glass seal in an otherwise sound CGI frame is a straightforward glass replacement. A cracked frame, a warped sash, or a door with a compromised rail is a replacement job, and we will tell you that before we order anything. If you are unsure which camp your window falls into, call (831) 480-4124 and we will look at it during a free estimate.
Our CGI Service Process – Step by Step
- 1
Diagnosis. We inspect the window or door, often removing the sash or panel to check the glazing, balances, and track condition. We note the specific CGI series and the exact failure, photograph everything, and explain the cause in plain language.
- 2
Repair or install. We order the correct CGI or aftermarket part, schedule the work at a time that suits your household, and arrive with shoe covers and drop cloths on. Quiet tools during nap time, pet-safe sealants wherever alternatives exist, and respect for every room we walk through. C.A.R.E. values on every visit: Clean up, Ask before moving anything, Respect your time, Explain the price before the work.
- 3
Test. After the repair or install, we open and close every sash, run the slider full travel, check the locks, and confirm the seals are seated. If it does not move the way a CGI product should move, we correct it before we pack up.
- 4
Warranty. Every job carries our 365-Day Done Right Promise. If the finished work is not right, we make it right. No debate, no countdown. The price in writing before the work, the cleanup photo before the crew leaves, and a live person answers the phone 24/7 if something does not feel right after we are gone.
See the difference
Before
After
Before
After
Before
AfterCGI Products We Service & Install in San Francisco
We work on the CGI Estate Collection, including vinyl single and double hung windows; the Sentinel Series, with impact casement and picture windows; the 950 Series hurricane-rated sliding glass doors; and the Classic Series, covering horizontal roller and awning windows. We stock common glazing beads, weatherstripping, screen frames, and roller hardware for these lines at our local shop, which shortens lead times on most San Francisco repairs. Many customers upgrade from older acrylic or single-pane units to energy-efficient CGI models when replacing, and we handle the full install as part of our Window Replacement services. Hurricane impact windows and horizontal roller or sliding impact windows are some of the most common CGI service requests we book.
We Also Service These Brands
We are multi-brand by design. Alongside CGI, we service and install PGT, CWS, ES Windows, and ECO Window Systems. If you have one window that needs repair but you are unsure of the manufacturer, call us. We will identify the brand on site and quote the right fix, not the brand we happen to prefer. Lightwell Windows San Francisco carries eight manufacturer lines, so the recommendation fits your home, not our inventory.
FAQs – CGI Windows & Doors Service in San Francisco
No. We are an independent CGI service provider, not an authorized or affiliated CGI dealer. That means we answer to you, not to a manufacturer rep. We use genuine CGI parts where a direct match is required and aftermarket parts where the original spec allows, and we tell you which is which before we order anything.
Yes, for locks, rollers, balances, and other hardware where a direct match matters. For weatherstripping, glazing beads, and screens, we source high-quality aftermarket parts that meet or exceed the original specification and cost less. If your CGI warranty is still active, we only use parts and methods that won’t void it.
Most single-window repairs are done in one visit. A fogged glass replacement on an Estate or Sentinel unit typically takes a few hours once the glass unit is in hand. Full window replacements take longer and depend on the number of openings; we will give you a written timeline with the quote. Call (831) 480-4124 and we will give you a realistic schedule for your specific repair.
We service and install the CGI Estate Collection, Sentinel Series, 950 Series sliding glass doors, and Classic Series horizontal roller and awning windows. We also handle older or discontinued CGI lines when parts are still available through our supplier network.
No. We work warranty-safe. We never modify a frame, sash, or hardware in a way that would invalidate a remaining CGI warranty, and we document the work so you have a record. If a repair is still under manufacturer coverage, we will tell you that too, so you can pursue the claim before paying out of pocket.
Most CGI glass replacements on a single sash run between $350 and $600 per opening in San Francisco, including the insulated unit and labor. Hardware repairs like rollers or locks typically run $150 to $300, and full CGI window replacements run $900 to $1,800 per opening depending on the series, the size, and whether the opening conditions are prepped. Exact pricing depends on what we find during the inspection. Call (831) 480-4124 for an exact quote; estimates are free and the price is in writing before anything starts.
Book Your CGI Service in San Francisco, CA
If you have a fogged CGI Estate sash, a jammed 950 Series slider, or a Classic Series window that will not close flush, we will look at it, name the cause, and quote the fix in writing before we touch anything. Call (831) 480-4124 to schedule your free CGI service estimate in San Francisco.
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.