Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
Fast, Reliable Window Installation Across Northridge
Window installation in Northridge carries a set of conditions you won’t find in Woodland Hills or Sherman Oaks. Homes here were rebuilt in waves after the 1994 earthquake, and the rough openings in those rebuilds don’t always measure square. A window ordered off standard spec will bind, rack, or leak. We measure every opening twice before we order anything, and we price the job from those measurements, not from a catalog guess. If you’re in the 91324 ZIP code and your windows are original to a 1990s rebuild, call (888) 635-0804. We’ll come out, lay eyes on the framing, and give you a written price.
Why TruePane Windows & Doors Is Northridge’s Preferred Window Installation Company
Dale Kessler founded TruePane in 2008 on a rule that still hangs in the shop: if the pane is not true, the job is not done. That rule matters more in Northridge than almost anywhere else in the San Fernando Valley. We’ve worked on enough post-quake rebuilds along Reseda Boulevard, through the neighborhoods north of CSUN, and down toward Northridge Fashion Center to know what’s behind the drywall before we cut into it. Our Window Installation team includes technicians who have done this work for two decades, and they know when a rough opening hides a sister-framed header instead of a full replacement.
We don’t run a regional call center. A live person answers the phone 24 hours a day, seven days a week. When a Northridge homeowner calls about a fogged slider or a window that won’t latch, they talk to someone who knows the difference between a 1950s ranch on a flat lot and a 1996 rebuild with a steel-plated header. Every technician is background-checked and uniformed. We register both manufacturer warranty layers in writing before the truck leaves the driveway. That’s The Keystone Standard, and it’s on every job we do in Northridge.
Our Window Installation Services in Northridge
The homes across Northridge split into two rough groups: pre-quake originals from the 1950s through the 1970s, and post-1994 rebuilds. Each demands different window choices and different installation care. Here are the four installs we do most often in 91324.
Sliding Windows
Sliding windows are everywhere in Northridge, especially in the ranch-style homes that run through the flat valley floor between Tampa and Corbin. The original aluminum sliders from the 1996 rebuild wave are now 25 to 30 years old, and many have failed seals. We replace them with modern vinyl or fiberglass sliders that carry low-E glass and argon fill, sized to the actual rough opening, not the nominal one. On a post-quake home, that often means a custom width off by three-eighths of an inch.

Double Hung Windows
Double hung installs give Northridge homeowners full top and bottom ventilation, which matters when summer afternoons push past 105°F. The inland heat here is a real factor. In July and August, the air inside a poorly glazed home on the west side of Reseda can be fifteen degrees hotter than a coastal house. We install double hungs with low Solar Heat Gain Coefficient glass on south- and west-facing walls, and we shim the frames to account for any racking in the opening before we set them.

Casement Windows
Casement windows seal tighter than sliders because the sash presses into the weatherstripping when it closes. That’s an advantage in Northridge, where summer heat and Santa Ana winds put constant stress on window seals. We’ve installed casements on split-level rebuilds off Devonshire Street where the original sliders had warped enough that you could see daylight through the closed seam. A properly set casement eliminates that gap and locks the conditioned air inside.

Awning Windows
Awning windows hinge at the top and open outward, which makes them useful above garden tubs, in basement hopper openings, and in rooms where a full casement would swing into a walkway. Northridge basements are less common than in the hills, but garden-level windows show up in split-levels and on additions. We hang awnings with the same shim-and-flash care as every other unit, because a window installed out of true will leak regardless of brand.

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 Northridge
TruePane is an authorized installer for more than a dozen manufacturer lines, including, PGT, CGI, and ES Windows. For Northridge rebuilds, we also quote Ply Gem and CWS when the homeowner wants a strong mid-range option without paying for coastal impact ratings they don’t need in the valley. We’ll put the quotes side by side on paper so you see exactly what you’re buying, and we keep common replacement parts for these lines in local stock so a follow-up doesn’t leave you waiting on a freight shipment. A live person answers the phone, and we’ll be there when we say.
Common Window Installation Problems We See in Northridge Homes
- Post-quake rough openings that aren’t square. After the 1994 Northridge Earthquake, many homeowners repaired window headers with sister-framing or steel plates instead of full header replacement. The opening looks fine on the outside, but the framing behind the drywall is off by a quarter to half an inch. A standard window jams or binds. We measure the actual opening before we order, and we shim and flash around the irregular framing so the new unit sits true.
- Failed seals in 1990s dual-pane sliders. The rebuild wave of 1995 through 1998 put a lot of basic dual-pane aluminum sliders into Northridge homes. Those insulated glass units were never built for 25 years of 105°F valley heat. Fog between the panes means the argon filler is gone and the window is acting like a single pane with a view. Replacement is the fix.
- Legacy aluminum frames that rack in summer heat. Aluminum expands a lot when the temperature climbs. An aluminum sash on a west-facing Northridge window can grow enough in July to stick, bind, and tear the weatherstripping. That’s a functional failure, not a cosmetic one. Modern vinyl and fiberglass frames move far less with thermal swings.
- County permitting and larger-lot setbacks. Parts of Northridge fall under Los Angeles County jurisdiction, not the city. That changes the window permitting picture, especially on larger single-family parcels. We help homeowners understand whether a window replacement needs a permit and we pull permits when the job calls for them. We don’t cut corners on the paperwork.
Pricing for Window Installation in Northridge, CA
A standard vinyl slider replacement in Northridge typically runs $450 to $900 per window installed, depending on size and framing condition. Double hung windows run $550 to $1,100 per unit. Casement windows run $650 to $1,200 each. If the rough opening needs corrective shimming because of post-quake framing, add $75 to $150 per opening for the extra flashing and labor. A full-house window replacement on a 1,800-square-foot Northridge ranch usually lands between $12,000 and $24,000 when you’re buying mid-range to premium lines. The quote changes based on what’s behind the drywall, and we find that out before we price. Call (888) 635-0804 for a free estimate. We give you a written line-item quote, and we register both warranty layers before the job starts. The Done Right Promise covers every install.
We Also Serve Cities Near Northridge
Our crews work throughout the central and western San Fernando Valley. If you’re in Chatsworth, Canoga Park, North Hills, or Encino, we bring the same approach: measure every opening twice, quote manufacturer lines side by side, and register the warranties in writing. The post-quake framing quirks don’t stop at the city line, but your home’s history does affect the install. Call (888) 635-0804 to schedule a free estimate anywhere in the area.
Serving Northridge, CA - Our Local Coverage Area
We’re based in the Northridge 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 Northridge
The rough openings in many 91324 rebuilds were repaired with sister-framing or steel plates rather than full header replacement, which means the openings look square but aren’t. A window ordered to nominal dimensions will bind or rack. We measure the actual opening, order custom sizes where needed, and shim and flash around the irregular framing. Call (888) 635-0804 for an assessment of your specific openings.
Two waves are converging. The original windows on 1950s and 1960s tract homes are sixty to seventy years old and well past their useful life. Meanwhile, the replacement windows installed during the post-1994 rebuild boom are hitting the 25 to 30 year mark, which is when dual-pane seals fail and aluminum frames begin to rack. Thousands of Northridge homes are in replacement territory right now. Call (888) 635-0804 and we’ll tell you honestly whether your windows have years left or need to go.
Yes. Portions of Northridge fall under Los Angeles County jurisdiction rather than city of Los Angeles. On larger single-family lots with septic systems, window replacement can trigger county review if the work changes the building envelope or if the structure sits near a septic setback line. We pull permits when required and coordinate with county inspectors. Ask us before you buy windows whether your parcel is city or county. A free call to (888) 635-0804 clears this up fast.
A modern low-E, argon-filled window in Northridge’s Climate Zone 9 will cut cooling costs measurably compared to a 1996 aluminum slider with a failed seal. In summer, when outdoor temperatures run 105°F or more, the difference in solar heat gain between a legacy dual-pane and a current Title 24-compliant unit is significant. The exact savings depend on window area, orientation, and your HVAC usage. We’ll quote the upgrade and you can run your own numbers before you commit. Estimates are free at (888) 635-0804.
Fog between the panes means the seal on the insulated glass unit has failed, the argon fill has escaped, and the window is functioning like a single pane with condensation trapped inside. It cannot be cleaned off from the outside because the moisture is between the layers. Replacement is the standard repair. Call (888) 635-0804 and we’ll measure for a new unit that fits your rough opening, including any post-quake framing correction.
Written by Dale Kessler, Owner at TruePane Windows & Doors, serving Northridge through a heritage of craft that stretches back many years.



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