On-Site Measure and Spec
We measure every opening with a tape measure, check the rough opening and sill, and spec the frame color, glass package, and grid pattern. You approve the final drawing before we order anything.
Licensed
Licensed & Bonded
Fully Insured
Insured & Bonded
24/7 Emergency
Same-Day Response
Warranty Backed
16+ Years Trusted in Los Angeles
What Our Fiberglass Window Replacement Includes
Every job is priced as a complete installation, not a window dropped at your door. Here is what comes with the work when we replace your windows in Los Angeles.
Old Window Removal
We pull the old sashes and frames, protect your floors and furniture, and haul everything away. If we find rot or water damage in the opening, we show you and fix it before the new unit goes in.
Fiberglass Unit and Glass
Your new fiberglass frame arrives with insulated low-E glass, argon fill where specified, and fresh weatherstripping. We set it on window setting blocks and shim it level so it operates smoothly for years.
Flashing and Sealing
Flashing tape goes over the sill pan, and we insulate the perimeter gap with an insulation gun. Interior and exterior get sealed with silicone caulk. This is the step that keeps water out during winter rain.
Hardware and Screens
Locks, cranks, balances, and screens are installed and tested before we leave. You open, close, and lock every window yourself during the walkthrough. Anything that does not feel right gets adjusted on the spot.
Permits and Cleanup
When the job requires a permit, we handle the CSLB paperwork. We pull stickers, wipe glass, sweep the work area, and take the old windows with us. You are left with a clean house and working windows.
Fiberglass Window Replacement Los Angeles CA, Explained
Fiberglass Window Replacement Los Angeles CA is the removal of your old window units and the installation of pultruded fiberglass frames fitted with insulated glass, low-E coatings, and fresh weatherstripping. The frame is a glass-reinforced composite, so it expands and contracts far less than vinyl or aluminum. We pull the old sash, check the rough opening, set the new unit on window setting blocks, shim it level, insulate the gap, and seal it with flashing tape and silicone caulk.
Los Angeles homes take a beating that most window brands are not built for. Afternoon sun in the Valley pushes glass temperatures past 140 degrees, then coastal air in Santa Monica cools everything down by evening. That swing is what rots wood frames, breaks seals, and fogs double-pane glass. If you have been searching for fiberglass window replacement near me Los Angeles and getting thin answers, we walk you through frame options, glass packages, and NFRC ratings before you spend a dollar.
How Our Fiberglass Window Installation Runs
Five steps, no surprises. Here is exactly what happens from the first phone call to the final walkthrough.
01
Schedule
Call or book online — a real human picks up and confirms a 2-hour arrival window.
02
Diagnose
Licensed tech inspects on-site, then walks you through the cause and your options.
03
Fix
The job is completed to code and done right the first time — no shortcuts, no surprises.
04
Guarantee
Every job backed by a written workmanship warranty — and we stand behind it.
Tools and Methods We Use
Tools & Equipment
Tape measure and level
Every opening gets measured twice and checked for square before we order. A window that is out of level by an eighth of an inch will not operate right, so this is where the job is won.
Pry bar and utility knife
Used to pull old sashes, trim, and frames without damaging the surrounding wall. Careful tear-out saves you drywall and stucco repair later.
Window setting blocks and shims
The unit sits on setting blocks and gets shimmed at the sides so the frame stays true. This is what keeps sashes gliding instead of binding.
Flashing tape and silicone caulk
Flashing tape seals the sill pan before the unit goes in, and silicone caulk seals the interior and exterior perimeter. Together they keep wind-driven rain out.
Insulation gun and caulking gun
The insulation gun fills the perimeter gap evenly, and the caulking gun lays a clean bead without smearing. Both matter for energy performance and looks.
Drill and screwdriver set
Used to fasten the frame, install hardware, and set locks and cranks. We check torque on every fastener so nothing backs out over time.
Methods & Standards
AAMA installation standards
We follow AAMA guidance for setting, shimming, flashing, and sealing windows. That means the unit is anchored correctly and water is directed out of the wall, not into it. It is the difference between a window that lasts 20 years and one that leaks in three.
NFRC-rated glass selection
Every glass package we spec carries NFRC ratings for U-factor and solar heat gain. In Los Angeles we lean toward low-E coatings and argon fill to cut cooling load. You see the numbers before you buy.
ENERGY STAR climate-zone matching
We match the window to the climate zone your address falls in, so the performance claims are real for your house. A package that works in Pasadena may not be the best fit in Santa Monica. We spec per address.
Flashing tape over sill pan
Before the unit goes in, we lay flashing tape across the sill and up the sides. This is the detail most leak calls trace back to. We do it on every opening, every job.
When Fiberglass Window Replacement Makes Sense
01
A 1950s ranch in Woodland Hills with original single-pane windows facing west.
What we do: We replace the units with fiberglass frames and low-E glass that blocks solar heat gain, then flash and seal each opening. The west-facing rooms stop baking in the afternoon.
→ Cooler rooms, lower AC runtime, and windows that open smoothly instead of sticking in the track.
02
A Santa Monica condo with aluminum frames pitted from salt air and foggy glass.
What we do: We handle the HOA submittal, then install fiberglass units with the same profile and finish. New flashing and caulk protect the openings from coastal moisture.
→ Clear glass, tight seals, and frames that will not corrode the way aluminum did.
03
A Pasadena bungalow with rotted wood sills and paint failing every two years.
What we do: We cut out the rot, repair the rough openings, and set fiberglass units with proper sill flashing. No more scraping and repainting the frames.
→ A permanent fix for the rot, plus better insulation and a cleaner look from the street.
04
A North Hollywood duplex where street noise keeps tenants awake.
What we do: We install fiberglass windows with laminated glass on the street-facing walls and standard insulated glass on the back. Every unit is shimmed level and sealed tight.
→ Quieter bedrooms, happier tenants, and fewer turnover complaints about noise.
How Fiberglass Window Replacement Runs in Los Angeles
Los Angeles is a tough town on windows. Inland neighborhoods like Woodland Hills and Northridge see summer highs over 100 degrees, while Santa Monica and the Westside sit in cool marine air. That daily swing expands and contracts frame materials, and it is why vinyl sags and wood rots here faster than in milder markets. Fiberglass holds its shape through both extremes. We also deal with older housing stock: 1920s bungalows in Pasadena, mid-century ranches in the Valley, and stucco condos on the Westside. Each one needs a different flashing and trim approach, and we spec the glass package to the wall exposure, not a generic default. If you are comparing fiberglass window installation cost Los Angeles wide, the honest answer is that exposure, size, and glass package drive the number more than the brand name on the frame. We pull permits through the CSLB when required and handle HOA submittals for condo and historic-district jobs.
Neighborhoods We Serve
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Sherman Oaks
Mix of 1950s ranches and newer builds. Many homes have original wood frames that have dried and cracked from Valley heat, so we see a lot of full frame replacements here.
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Santa Monica
Salt air and coastal fog attack metal and wood frames. Fiberglass and composite units hold up better, and HOA rules often require matching the existing profile and finish.
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Pasadena
Historic districts may require specific trim and grid patterns. We spec fiberglass units that match the look while upgrading the glass and seals underneath.
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North Hollywood
Freeway and boulevard noise is a common complaint. Laminated glass on street-facing walls makes a real difference for bedrooms and home offices.
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Woodland Hills
West-facing walls take the worst afternoon sun in the Valley. Low-E glass with a higher solar heat gain rejection is the right call on those elevations.
Local Conditions We Plan For
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Summer glass temperatures over 140 degrees on west-facing walls
Heat stress is what breaks seals and fogs insulated glass. Fiberglass frames and low-E coatings reduce the load and extend the life of the unit.
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Coastal fog and salt air on the Westside
Metal frames corrode and wood frames absorb moisture. Fiberglass does neither, so the frame stays solid and the finish stays intact.
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Older stucco and wood-siding homes with out-of-square openings
We measure and shim carefully, and repair the opening when needed, so the new unit sits true and seals properly instead of getting forced into a crooked hole.
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Winter rain driven sideways by wind
Flashing tape over the sill pan and proper exterior caulk are what keep water out. We do this on every opening, not just the ones that look exposed.
Woodland Hills West-Facing Ranch
Window Problems We Fix Every Week in Los Angeles
Most calls start with one of these. Each one has a real cause, and each one has a fix that lasts longer than a tube of caulk.
Problem
Foggy glass and condensation between panes
A failed seal lets moisture into the insulated glass unit. The fog never clears, the view is gone, and the window stops insulating the way it should.
Our Fix
We replace the unit with new insulated low-E glass and check the frame for the cause. If the frame is warped or the seal failed because of heat stress, fiberglass replacement solves it at the source.
Problem
Drafty windows that whistle in winter
Air leaks around the sash and frame push your heating bill up and make rooms uncomfortable. They also let dust and pollen in all year.
Our Fix
We install fiberglass units with new weatherstripping and insulate the perimeter gap. The frame does not warp, so the seal stays tight season after season instead of opening up again in a year.
Problem
Rotted wood frames and soft sills
Water sitting on a wood sill breaks down the fibers until the frame is structural mush. Paint hides it for a while, then the window starts leaking into the wall.
Our Fix
We remove the rotted material, repair the opening, and set a fiberglass unit that will not absorb water. No repainting every few years, no rot coming back.
Problem
Sticking windows that will not open
Swollen wood or warped vinyl jams the sash in the frame. You stop opening the window, lose ventilation, and eventually the balance or hardware breaks.
Our Fix
Fiberglass frames hold their shape through heat and cool cycles, so sashes keep moving. We set every unit level with shims and test the operation before we caulk.
Problem
Street and freeway noise coming through
Single-pane glass and loose frames let traffic noise straight into bedrooms and living rooms. It affects sleep and makes the house feel less private.
Our Fix
We spec laminated or double-pane glass with fiberglass frames that seal tight. Customers near the 101 and major boulevards notice the drop the first night.
Why Fiberglass Frames Win in Los Angeles
Fiberglass costs more than basic vinyl, and it earns that back in a climate like ours. Here is what changes once the new units are set and sealed.
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Frames That Do Not Rot
Wood frames in older Los Angeles homes soak up moisture from morning fog and sprinkler overspray until the sill softens. Fiberglass does not absorb water, so no swelling, no rot, no repainting every few years. We have pulled 60-year-old wood sashes out of Pasadena bungalows that crumbled in our hands.
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Lower Cooling Bills
Low-E glass with argon gas blocks a large share of solar heat gain, which matters when your AC runs from May through October. Pair that with tight weatherstripping and you stop paying to cool the front yard. Most customers notice the difference on their first summer bill after fiberglass window replacement in Los Angeles, California.
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Quieter Rooms
Fiberglass frames plus laminated or double-pane glass cut traffic noise from boulevards and freeways. Bedrooms facing Ventura Boulevard or the 101 quiet down enough to sleep through a garbage truck at 5 a.m. That is the upgrade most people did not know they were buying.
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Straight, Smooth Operation
Composite frames hold their shape, so sashes do not stick in August or rattle in January. We set every unit level with shims and check the balance before we caulk. You get windows that open with two fingers for the next 20 years instead of fighting them every season.
Licensed, Insured, and Local
Licensed & Certified
- California Contractor License (CSLB) — issued by California Contractors State License Board
- ENERGY STAR Partner — issued by U.S. Environmental Protection Agency
- AAMA Member — issued by American Architectural Manufacturers Association
- NFRC Certified Ratings — issued by National Fenestration Rating Council
- OSHA-Compliant Job Sites — issued by Occupational Safety and Health Administration
Verified Reviews
Google ★★★★★4.9
Replaced 14 windows in our Encino house with fiberglass units. Crew was on time, cleaned up daily, and the price matched the quote exactly. The house is quieter and the west rooms are cooler. Would use them again without hesitation.
Yelp ★★★★★4.8
We had three companies bid our window job. American Reliable was the only one that measured carefully and explained the glass options. Fiberglass windows went in over two days and the difference in noise from the street is huge.
BBB A+
Fair pricing, clear communication, and they handled the HOA paperwork for our Santa Monica condo. The fiberglass frames look great and operate smoothly. One small adjustment needed after install and they came out the next day.
Google ★★★★★5.0
Called about foggy glass in our Northridge home and they gave us a straight answer about replacing the units rather than trying to sell us something we did not need. Fiberglass install was clean and the new windows seal tight.
16 Years Replacing Windows in Los Angeles
American Reliable Windows & Doors has been installing windows since 2010, which puts us at 16 years serving Los Angeles County. In that time we have worked on Spanish colonial homes in Hancock Park, mid-century ranches in Woodland Hills, and condos in Beverly Hills with strict HOA rules. Our installers are trained on AAMA installation standards and pull permits through the California Contractor License (CSLB) process when the job requires it. We know which fiberglass frames hold up to Valley heat and which glass packages actually earn the ENERGY STAR label in this climate zone.
- 16 years and thousands of window openings replaced across Los Angeles County.
- Installers trained to AAMA and WDMA installation standards, not day labor.
- We handle CSLB permit paperwork and HOA submittals for you.
- Every job spec'd with NFRC-rated glass so the numbers are verifiable.
- We stock Andersen, Pella, Marvin, Milgard, and Simonton fiberglass lines.
What Los Angeles Customers Say
Real experiences from customers who chose our Fiberglass Window Replacement services.
“We had 11 windows replaced with fiberglass double hung units and the crew finished in two days. The house is noticeably quieter from the 101 noise and the back bedrooms stay cooler in the afternoon. They found a rotted sill in the kitchen and fixed it instead of covering it up. Fair price, clean work.”
M
Marisol R.
Homeowner, Sherman Oaks
“Our old vinyl windows had warped from the Valley heat and two of them would not close. American Reliable swapped them for fiberglass and the difference is night and day. Sashes glide, no drafts, and the low-E glass cut the glare on the west side of the house. They showed up when they said they would.”
D
Danny K.
Homeowner, Woodland Hills
“HOA approval was the hard part and they handled the paperwork for us. Six fiberglass windows installed in one day, all sealed and flashed properly. The salt air had eaten the old frames, so this was overdue. Two years in, no fogging, no sticking, no issues.”
P
Priya S.
Condo Owner, Santa Monica
Frequently Asked Questions
Real answers to the questions we hear most often from local homeowners and property managers.
How much does Fiberglass Window Replacement cost in Los Angeles?
Most fiberglass window replacement in Los Angeles runs $900 to $2,200 per window installed in 2026, depending on size, glass package, and frame line. A basic double hung in a standard opening sits near the low end; large picture windows, bay units, and laminated glass push higher. Full-house jobs usually land between $12,000 and $35,000. We give you an itemized price on the first visit.
What is fiberglass window installation in Los Angeles CA?
It is the removal of your existing window and the installation of a pultruded fiberglass frame with insulated glass, set level on shims, insulated at the perimeter, and sealed with flashing tape and caulk. Fiberglass is a composite, so it does not rot, warp, or expand like wood and aluminum. In Los Angeles, that stability matters because of the daily heat swing between inland valleys and the coast.
Who offers Fiberglass Window Replacement near me in Los Angeles?
American Reliable Windows & Doors has served Los Angeles County since 2010 from our base in the San Fernando Valley. We cover Sherman Oaks, North Hollywood, Santa Monica, Pasadena, Beverly Hills, and everywhere between. Call +1 (747) 298-4287 and we will schedule an in-home measure, usually within a few days. You get a written price the same visit.
Are fiberglass windows good for Los Angeles homes?
Yes. Fiberglass handles the two things that kill windows here: intense UV and big temperature swings. The frames do not absorb moisture from coastal fog, and low-E glass with argon cuts solar heat gain during long Valley summers. They also hold up to seismic movement better than brittle vinyl. For most Los Angeles homes, fiberglass is the last window you will need to buy.
Related Services
Full Frame Window Replacement
When the existing frame is rotted or out of square, we tear out to the rough opening and build fresh. This is the right call for older Los Angeles homes where the original wood has softened. Fiberglass units drop into the new opening with proper flashing and insulation.
View Full Frame Window ReplacementRetrofit Window Replacement
Retrofit keeps your existing frame and fits a new fiberglass unit inside it. It costs less than a full frame job and takes less time, which suits stucco homes where the exterior is in good shape. We check the old frame first and tell you honestly if retrofit will work.
View Retrofit Window ReplacementInsert Window Replacement
Insert windows reuse the existing jamb and slide a new fiberglass sash and frame into place. It is the fastest option and the least invasive to your interior trim. Ideal for condos and rentals where you want better glass and tighter seals without touching the walls.
View Insert Window ReplacementWindow Sash Replacement
If your frame is solid but the sashes are shot, we replace just the moving parts. Foggy glass, broken balances, and failed locks get fixed without a full tear-out. Fiberglass sashes pair well with existing frames and cost a fraction of a full replacement.
View Window Sash ReplacementDouble Hung Window Replacement
Double hung is the most common window in Los Angeles homes, and fiberglass versions tilt in for easy cleaning. Both sashes move, so you get airflow control on hot afternoons. We install them with low-E glass and tight weatherstripping for real energy gains.
View Double Hung Window ReplacementSingle Hung Window Replacement
Single hung windows cost less than double hung and work well in bedrooms and hallways where only the bottom sash needs to open. Fiberglass frames keep them operating smoothly for decades. We match trim and grid patterns to the rest of your house.
View Single Hung Window ReplacementContact American Reliable Windows & Doors
Call +1 (747) 298-4287 or email us and we will get you on the schedule. We answer the phone seven days a week and can usually book a same-day estimate if you reach us before noon. Tell us how many windows, what material you are leaning toward, and whether anything is broken or leaking.
American Reliable Windows & Doors
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Phone
+1 (747) 298-4287 -
Address
6161 Van Nuys Blvd Van Nuys, CA 91401, Los Angeles, California
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Hours
Mon–Fri: 7AM – 7PM
Sat: 8AM – 4PM
Sun: Emergency Only
24/7 Emergency Available