Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
Before
After
Before
After
Before
AfterWindows & Doors in Northridge, CA
Window installation in Northridge, CA means working with a housing stock that was either built in the 1950s-1970s or rebuilt during the 1994-1996 post-earthquake wave. Most homes on any given block carry either original aluminum single-pane sliders or mid-1990s vinyl replacements that are now past their service life. Add summer highs of 105-110°F and you get a market where dual-pane Low-E glass isn’t an upgrade, it’s the baseline. Call Sightline Windows & Doors at (509) 265-6387 for a written, line-item price before any work begins.
Key takeaways:
- Northridge sits at the epicenter of the 1994 earthquake; many rough openings are still out of square by half an inch or more.
- Two aging window cohorts coexist here: pre-1994 originals and post-quake vinyl replacements, both now due.
- Summer thermal cycling warps vinyl frames and threshold seals specified for milder coastal conditions.
- Every Sightline job starts with a measured survey you keep, and the written quote cannot differ from that document.
Why Northridge Homes Are Different
Northridge is the literal epicenter of the 1994 Northridge earthquake, a 6.7 Mw event that damaged or destroyed tens of thousands of homes and triggered an insurance-funded rebuilding wave in 1994-1996. Those post-quake replacement windows and doors are now 28-30 years old and aging out simultaneously, which is why so many streets in Northridge are seeing a concentrated replacement cycle right now. Homes that were structurally patched rather than fully rebuilt still carry racked or out-of-plumb frames, and that makes proper window and door fitting more technically demanding here than in undisturbed neighboring communities like Reseda or Granada Hills.
The housing stock is dominated by post-WWII single-family stucco tract homes from the 1950s through the 1970s, many of which still have original aluminum single-pane sliding windows. The 1994 earthquake triggered so many insurance-funded renovations that a large share of the housing stock was partially or fully re-windowed in the mid-1990s. That means two distinct aging cohorts exist on the same block: pre-1994 originals and post-quake vinyl replacements, each failing in different ways.
Climate adds another layer. Northridge sits deep in the San Fernando Valley’s inland heat bowl, regularly recording summer highs of 105-110°F. Low-SHGC, dual-pane Low-E glass is not a luxury here, it’s the minimum spec that keeps a west-facing living room habitable in August. Extreme thermal cycling also causes vinyl frames and threshold seals installed to milder coastal specifications to warp, and doors on west- and south-facing elevations routinely bind mid-summer as frames expand. Along Reseda Boulevard and the Devonshire corridor, technicians frequently find door rough openings visibly out of square by half an inch or more, earthquake damage that was drywalled over in 1994-1995 but never re-plumbed. Standard replacement work in a non-epicenter neighborhood would never encounter this, but in Northridge it’s routine.
Our Main Northridge Services
Northridge homeowners call us most often about two things: doors that no longer close square after years of thermal cycling and earthquake-racked frames, and windows that are past their useful life from either the pre-1994 or post-quake era. Here’s what each involves in Northridge.
Door Installation in Northridge
Door installation in Northridge frequently means fitting a new pre-hung unit into an opening that hasn’t been square since January 17, 1994. We shim, re-plumb, and rebuild jambs as needed rather than forcing a door into a racked frame. Summer heat expansion on south-facing entries makes proper clearance critical, and we cut hinge and strike tolerances accordingly. Every install begins with a measured survey the homeowner keeps, and the written price follows that document exactly. Door Installation in Northridge covers the full scope, from entry doors to interior replacements.
Window Replacement in Northridge
Window replacement in Northridge means addressing two distinct failure patterns: original 1950s-1970s aluminum sliders with failed seals and pitted tracks, and mid-1990s vinyl units whose Low-E coatings and weatherstripping are now spent. Because the 1994 quake left so many rough openings out of square, we measure every opening in three places, crown and diagonal, before ordering a single unit. That documentation is yours to keep. Window Replacement in Northridge details the full process for homes across the community.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
BeforeAfterWindow Installation in Northridge
Window installation in Northridge means fitting new units into openings that have been through a 6.7-magnitude earthquake and 28-30 years of 105°F thermal cycling. The work is more demanding here than in most of the Valley because we’re regularly correcting out-of-plumb rough openings, not just swapping sashes. Window Installation under the Haven Standard means a measured survey you keep, a written price before anything is ordered, and a documented photo record when the job is done.
Single & Double Hung Windows
Signs you need it
Sashes that won’t stay up, visible gaps at the meeting rail, or condensation between panes on original hung windows.
What it costs in Northridge
Single and double hung window installation in Northridge typically runs $380-$890 per window depending on size, frame material, and whether the opening needs re-plumbing.
How we do it
We measure crown and diagonal on the rough opening, re-plumb and shim as needed, set the new unit, insulate the cavity, and trim out with a tight interior and exterior seal.
Horizontal Roller Windows
Signs you need it
Sticking or groaning tracks, corroded aluminum rollers, or drafts along the sill on the original horizontal sliders common in 1950s-1970s Northridge tract homes.
What it costs in Northridge
Expect $340-$780 per horizontal roller window in Northridge, with the higher end covering custom sizes and earthquake-racked openings that need extra shim work.
How we do it
We pull the old sash, inspect the rough opening for racking, build the opening back to square with shims, and set the new roller window on fresh track.
What Window Installation Costs in Northridge
| Item | Typical range in Northridge |
|---|---|
| Single & double hung window | $380 - $890 per window |
| Horizontal roller window | $340 - $780 per window |
| Full-home window installation (10-15 openings) | $7,000 - $22,000 |
How long does window installation take in Northridge?
A typical single-story Northridge home with 10-12 windows takes two to three working days. Out-of-square openings requiring re-plumbing and custom jamb work add roughly half a day per window. Call (509) 265-6387 for a written schedule with your estimate.
Will the price change once work starts?
No. The measured survey is the quote, and the quote is the invoice. If hidden frame damage is found, we document it and agree on a written change order before proceeding. Estimates are free.
Impact Windows & Doors in Northridge
Impact windows and doors in Northridge are not just about hurricanes. Northridge sits at the epicenter of a 6.7-magnitude earthquake and its post-quake homes have openings that are often out of square, so an impact-rated unit here has to combine structural glass with a frame that tolerates racking. Impact Windows & Doors under the Haven Standard are specified by opening, not by margin, from lines like PGT and CGI.
Impact-Resistant Windows
Signs you need it
Cracked or crazed glazing, failed seals on older heat-strengthened glass, or single-pane originals on a home that has already survived one major seismic event.
What it costs in Northridge
Impact-resistant windows in Northridge typically run $850-$1,800 per opening, with the higher end covering large fixed panels and laminated glass in non-standard sizes.
How we do it
We survey the opening, confirm design pressure requirements, order impact-rated laminated glass from PGT or CGI, and set the unit with a full perimeter seal.
Single Hung Impact Windows
Signs you need it
Original single-pane hung windows on a home built before 1994, especially on street-facing elevations where flying debris risk is highest.
What it costs in Northridge
Single hung impact windows in Northridge run $650-$1,200 per window, with custom sizing and low-SHGC coatings at the upper end.
How we do it
We measure each opening in three places, correct any earthquake racking, and install the impact-rated hung unit with interlocking meeting rails.
What Impact Windows & Doors Costs in Northridge
| Item | Typical range in Northridge |
|---|---|
| Impact-resistant window | $850 - $1,800 per opening |
| Single hung impact window | $650 - $1,200 per window |
| Impact French door | $4,500 - $9,500 per door |
Are impact windows worth it in Northridge if we’re not in a flood zone?
Yes, for two reasons. They meet the Los Angeles wind-load code for the Valley, and they protect against debris in any high-wind event. They also cut noise and heat gain. Call (509) 265-6387 for a written quote.
Do impact windows block summer heat in Northridge?
Impact-rated laminated glass with a Low-E coating cuts solar heat gain significantly, which matters when Northridge hits 105°F in July. The SHGC rating on each unit tells you exactly how much. Estimates include full spec sheets.
Energy-Efficient Windows in Northridge
Energy-efficient windows in Northridge are the difference between a July cooling bill you accept and one you dread. This community sits deep in the Valley’s inland heat bowl at 105-110°F in summer, so low-SHGC dual-pane Low-E glass is the floor, not the ceiling. Energy-Efficient Windows in Northridge are specified by U-factor and SHGC first, then by manufacturer, because the spec sheet is the promise.
Low-E & Argon Gas Glass
Signs you need it
Rooms on the west and south sides that spike 10-15°F above the rest of the house by 4 p.m. in summer, or single-pane originals still carrying 1970s-era glazing.
What it costs in Northridge
Low-E argon gas glass replacement in Northridge typically runs $500-$1,100 per window, with the higher end covering triple-pane and low-SHGC coatings.
How we do it
We take frame readings, specify the correct U-factor and SHGC for each elevation, and install dual-pane Low-E units with argon fill and warm-edge spacers.
ENERGY STAR Replacement Windows
Signs you need it
Utility bills in July and August that run noticeably higher than neighbors’ with similar square footage, or visible drafts at window perimeters in winter.
What it costs in Northridge
ENERGY STAR replacement windows for Northridge homes typically cost $550-$1,300 per window installed, depending on frame material and glass package.
How we do it
We confirm the Southern California ENERGY STAR zone, select the glass package that meets or exceeds it, and document the U-factor and SHGC on your written quote.
What Energy-Efficient Windows Costs in Northridge
| Item | Typical range in Northridge |
|---|---|
| Low-E & argon gas window | $500 - $1,100 per window |
| ENERGY STAR replacement window | $550 - $1,300 per window |
| UV-blocking window film package (per room) | $180 - $450 per room |
Which is more important in Northridge, U-factor or SHGC?
SHGC. Northridge runs 105°F regularly in summer, so solar heat gain through glass matters more than conductive heat loss. We spec low-SHGC on west- and south-facing elevations and balance U-factor for winter mornings. Call (509) 265-6387 for a written glass recommendation.
Will new windows actually lower my cooling bill in Northridge?
Yes, measurably. Replacing single-pane aluminum with dual-pane Low-E typically cuts heat gain through glass by 40-60% in a Valley summer. Your written quote includes the glass specs to verify that. Estimates are free.
Sliding & Patio Doors in Northridge
Sliding and patio doors in Northridge fail in a predictable pattern: summer heat expansion binds the panel, and earthquake-racked jambs make the binding permanent. Doors on west- and south-facing elevations are most vulnerable, and the 1994 quake left enough drywalled-over racking that we routinely rebuild rough openings rather than swap in a new door. Sliding & Patio Doors in Northridge are fitted to the opening as it actually is, not as the original builder assumed.
Patio Doors
Signs you need it
A door that scrapes the track in summer but not winter, daylight visible at the corners, or a handle that requires two hands to operate.
What it costs in Northridge
Patio door installation in Northridge typically runs $2,600-$6,800, with the higher end covering French-style configurations and torsion correction on racked openings.
How we do it
We pull the old unit, measure the rough opening crown and diagonal, rebuild the opening square with kiln-dried shims, and set the new door on a level, sealed threshold.
Sliding Glass Door Replacement
Signs you need it
Failed rollers, worn tracks with visible grooves, or glass that fogs between panes on an original aluminum slider from the 1960s or 1970s.
What it costs in Northridge
Sliding glass door replacement in Northridge runs $1,800-$4,500 per door, with impact-rated glass and low-SHGC packages at the upper end.
How we do it
We replace the frame and panel together, set the new track dead level, and adjust rollers so the door moves with one finger even in August heat.
What Sliding & Patio Doors Costs in Northridge
| Item | Typical range in Northridge |
|---|---|
| Patio door (standard 6 ft slider) | $2,600 - $6,800 |
| Sliding glass door replacement | $1,800 - $4,500 |
| Screen door installation | $280 - $650 |
Why does my patio door only stick in summer?
Thermal expansion. Northridge summer heat expands the frame and panel, and if the door was set with tight clearances, the panel binds. We set doors with clearances calculated for Valley temperature swings. Call (509) 265-6387 for an assessment.
How long does a sliding door replacement take in Northridge?
Most sliding door replacements in Northridge finish in one day. If the rough opening is heavily racked from 1994 and needs rebuilding, expect a second day. Your written quote includes the timeline.
Impact Garage Doors in Northridge
Impact garage doors in Northridge serve a garage that often doubles as storage, a workshop, or the main entry point on post-war tract homes. The 1994 quake collapsed or jammed thousands of garage doors across Northridge, and many that were repaired still carry bent tracks and misaligned panels. Impact Garage Doors in Northridge are specified to current wind-load code, not the 1970s standard the original door met.
Hurricane-Rated Garage Doors
Signs you need it
A door that flexes visibly in high wind, tracks with bent sections from 1994 repairs, or a single-skin steel panel that transfers every degree of Valley heat into the garage.
What it costs in Northridge
Hurricane-rated garage doors in Northridge run $2,900-$6,200, with insulated cores and reinforced track systems at the upper end.
How we do it
We verify the opening dimensions and existing track condition, replace tracks and springs together, and install a wind-load-rated door with a reinforced bottom bracket.
Energy-Efficient Garage Doors
Signs you need it
A west-facing garage that becomes an oven by mid-afternoon, or a door with no insulation and no thermal break between the outer and inner skins.
What it costs in Northridge
Energy-efficient garage doors in Northridge typically cost $2,300-$5,500 installed, depending on R-value and panel construction.
How we do it
We install a polyurethane-core door with a thermal break, replace the perimeter weatherstripping, and verify the door seals against the floor evenly.
What Impact Garage Doors Costs in Northridge
| Item | Typical range in Northridge |
|---|---|
| Hurricane-rated garage door | $2,900 - $6,200 |
| Energy-efficient garage door | $2,300 - $5,500 |
| Garage door replacement (standard) | $2,000 - $4,800 |
Does the city of Northridge require permits for garage door replacement?
Permit requirements vary by scope and whether structural work is involved. When a permit is required, we pull it and schedule the inspection. Your written quote states whether a permit applies. Call (509) 265-6387.
Can you replace just the garage door track and keep the existing door?
Yes, when the door is in good condition and the track is the problem. But after 30 years of Valley heat and 1994 quake damage, most Northridge doors need full replacement. A measured survey tells you for certain.
Custom & Geometric Windows in Northridge
Custom and geometric windows in Northridge often go into homes that were re-windowed in 1994-1996 with standard rectangles over openings that were never re-framed. Arched, radius, and shaped openings remain from original 1950s and 1960s construction, and fitting them properly means building the glass to the actual opening, not forcing the opening to fit a stock unit. Custom & Geometric Windows in Northridge are always measured to the opening as it exists after 30 years of settling and seismic movement.
Geometric & Shaped Windows
Signs you need it
Leaks at the peak of an arched or angled window, visible caulk lines that have cracked from thermal cycling, or glass that has pulled away from the frame on a radius unit.
What it costs in Northridge
Geometric and shaped windows in Northridge run $1,500-$4,200, with complex radius work and impact-rated glazing at the high end.
How we do it
We template the exact opening shape, order a custom unit from CWS or ES Windows, and set it with a perimeter seal that tolerates Valley temperature swings.
Arched & Curved Windows
Signs you need it
Failed seals in an arch-top unit, cracks radiating from the bottom corners of a radius window, or an original 1960s arch that was drywalled off but is now reverting to use.
What it costs in Northridge
Arched and curved windows in Northridge typically cost $2,000-$5,500 per unit, with true-radius glass and custom framing at the upper end.
How we do it
We take a physical template, confirm the radius in three places, and order a unit manufactured to that exact curve, not approximated to a stock arc.
What Custom & Geometric Windows Costs in Northridge
| Item | Typical range in Northridge |
|---|---|
| Geometric & shaped window | $1,500 - $4,200 |
| Arched & curved window | $2,000 - $5,500 |
| Oversized opening replacement | $3,500 - $9,000 |
Can you match a custom window shape to the original 1960s design in my Northridge home?
Yes. We template the existing opening or reconstruct it from the original framing and order a unit matched to that shape. We do not approximate arched openings with stock rectangles. Call (509) 265-6387 for a written template survey.
How long do custom windows take in Northridge?
Custom and geometric windows take three to five weeks from template to delivery, then one to two days to install. Your written quote states the production timeline for the specific shape.
Brands We Service in Northridge
We specify and install from PGT, CGI, and CWS lines in Northridge, chosen by performance tier and what the opening requires. Parts availability for these lines in the Valley is consistent, and most replacement hardware arrives within five to seven business days. See our brands for the full line card.
Pricing for Windows & Doors in Northridge, CA
| Service | Typical range in Northridge |
|---|---|
| Single & double hung window installation | $380 - $890 per window |
| Horizontal roller window installation | $340 - $780 per window |
| Full-home window installation (10-15 openings) | $7,000 - $22,000 |
| Impact window | $850 - $1,800 per opening |
| Low-E & argon gas window | $500 - $1,100 per window |
| Patio door | $2,600 - $6,800 |
| Sliding glass door replacement | $1,800 - $4,500 |
| Hurricane-rated garage door | $2,900 - $6,200 |
| Geometric & shaped window | $1,500 - $4,200 |
| Arched & curved window | $2,000 - $5,500 |
Prices in Northridge push upward when rough openings are out of square from 1994 earthquake damage and need re-plumbing, when custom sizing is required, and when low-SHGC or impact-rated glass packages are specified for west-facing elevations. Every Sightline quote is written before work starts, and the measured survey is the same document as the final invoice.
Neighborhoods We Serve in Northridge
We work across Northridge, including the post-war tract streets around Cal State Northridge, the Devonshire corridor, and the residential blocks off Reseda Boulevard. We measure and quote throughout the community, and scheduling is coordinated from our Los Angeles office for local dispatch.
- Devonshire corridor
- Reseda Boulevard residential district
- Near Cal State Northridge
- Northridge West
- Tampa Avenue corridor
Service Area - Cities Near Northridge
Sightline serves the communities around Northridge, including Chatsworth, CA, Canoga Park, CA, North Hills, CA, and Encino, CA. Scheduling and dispatch are coordinated from our Los Angeles office, and crews work Northridge locally.
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 About Windows & Doors in Northridge
We answer calls live, 24/7, and schedule measured surveys in Northridge based on crew availability. Most surveys happen within a few business days. Call (509) 265-6387 to confirm the next openings.
It depends on scope. Most like-for-like replacements don’t require a permit, but structural changes to openings or garage door track systems often do. Your written quote states whether a permit applies.
Yes. Bring us a competitor’s written estimate and we will review it at no charge. We’ll confirm the glass packages, installation scope, and whether the price matches the measured document. Call (509) 265-6387.
What happens when you call
- 1A real person answersNo phone trees - talk to a local windows & doors pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Northridge Customers Say
"Patio door had dropped and would not lock. They adjusted it rather than selling me a new one, and charged accordingly."
- Simone T."The survey measurements and the quote were the same piece of paper. Nothing changed on install day, which is not what happened with the two other companies we had out."
- Annette R."Replaced eight windows. They showed me the U-factor on the units they were actually fitting rather than the brochure numbers."
- Kofi B.