Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
Sliding glass doors
Impact garage doorsPGTCGI
Before
After
Before
After
Before
AfterFast, Reliable Window Installation Across Lennox
Window installation in Lennox means dealing with two things most contractors never think about: the LAX flight path overhead and sixty-year-old rough openings underneath the stucco. We’ve worked both. If your home sits under the arrival corridor and you’re replacing original single-pane aluminum sliders, the job is not just swapping glass. It’s matching or beating the STC rating your neighbors got through the Residential Sound Insulation Program, and it’s fixing the framing those old units were set into. Call (888) 635-0804 and we’ll walk the job with you, measure every opening twice, and put the quote on paper before you spend a dollar.
Why TruePane Windows & Doors Is Lennox’s Preferred Window Installation Company
We are not a franchise crew working Lennox from a map on a dashboard. Dale Kessler founded this company in 2008 on a rule that still governs every install: if the pane is not true, the job is not done. The people who show up at your door are background-checked, uniformed technicians who learned the trade as apprentices before earning their place as journeymen. They know what a 1950s wood-frame duplex on Inglewood Avenue looks like behind the stucco because they have opened those walls. When a Lennox homeowner calls with a fogged RSI window, the person answering the phone understands the question. We register both manufacturer warranty layers in writing before the truck leaves your driveway, and the Done Right Promise means if something is off, we come back and make it right. No paperwork fights. No arguing.
Our crews serve Lennox directly, dispatched from the Los Angeles office. We have replaced windows in homes west of Hawthorne Boulevard, up near Century Freeway, and through the side streets off Lennox Boulevard where the lots are tight and the stucco has been patched three times. Homeowners here have lived through enough contractor promises to ask hard questions. We answer them with a tape measure, a written quote, and a company that has been serving local communities since 2008.
Our Window Installation Services in Lennox
Every Lennox home is a little different once you get inside the wall, but the window types that hold up best here share one trait: they seal tight and stand up to salt air. These are the four we install most in this area.
Sliding Windows
Sliding windows are the most common original unit in Lennox’s post-WWII housing stock, and the most common source of air leaks and rattles under the flight path. When we set a new slider in a Lennox home, we check the rough opening with a level and a square before we do anything else. Many of those openings were never flashed properly, so we reframe where needed, add flashing tape, and set the new unit true. A properly installed Milgard or PGT slider with dual-pane glass will cut noticeably more jet noise than the original single-pane aluminum frame it replaces.
Single & Double Hung
Double-hung and single-hung windows show up a lot in the duplexes and rental homes that line Lennox’s side streets. The issue we see repeatedly is sash balances worn out from decades of coastal moisture, plus frames that have corroded at the bottom corners on west-facing elevations. Our Window Installation team sets these units with new balances, new flashing, and a clean interior return so the window opens and closes without binding. Double-hungs also give you controlled ventilation, which matters in a climate where you want airflow without opening a whole slider to the jet noise.
Casement Windows
Casement windows seal tighter than any other window type, which makes them a strong choice for Lennox homeowners who want to block sound and keep the marine layer outside. The crank mechanism compresses the sash against the weatherstripping all the way around, so there’s no gap for noise or air to slip through. We install casements from Ply Gem and Milgard, and we set them in reframed, flashed rough openings so that compression seal actually stays tight year after year.
Awning Windows
Awning windows work well in Lennox bathrooms and kitchens, where you want ventilation high on the wall without giving up privacy. They hinge at the top and open outward, so they vent even during a light drizzle. We use the same flashing and framing standards on a small awning window as we do on a big picture unit, because the seal is what matters. A small window that leaks is a big problem.
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.
Trusted Brands We Service in Lennox
We are an authorized installer for more than a dozen manufacturer lines, and for Lennox homes specifically we lean on brands that build good acoustic and corrosion-resistant units. PGT and CGI make impact-rated and high-STC windows that hold up under flight-path noise and salt air. Ply Gem offers strong mid-range double-hungs and sliders that fit the budget of a Lennox homeowner replacing multiple units at once. If you have a specific brand spec from the LAX RSI program or a management company requirement, we quote manufacturer lines side by side on paper so you see exactly what you are buying. We stock common replacement hardware for Lennox customers, which means less waiting on a sash or balance when a unit needs repair, not replacement.
Common Window Installation Problems We See in Lennox Homes
- Rotted or undersized framing around original single-pane openings. Many 1940s through 1960s Lennox homes had windows set into rough openings with no flashing tape and minimal shimming. We pull the old unit and often find dry rot in the jamb. Setting a new dual-pane window into that same rotted opening is a guaranteed seal failure in three to five years. We reframe to true dimension first.
- The original exterior stucco return reused without flashing. When a contractor skips the flashing tape and just butts the new window against the old stucco, marine-layer moisture wicks into the wall. On west-facing elevations a couple miles from the coast, that moisture corrodes the new window’s hardware faster than you would think possible. We flash every opening.
- RSI-installed windows replaced with code-minimum units that don’t match the STC rating. This is the one that makes homeowners call us after another contractor finishes. The new window looks fine, but the jet noise is suddenly worse than it was before. If your home went through the LAX sound-insulation program, the replacement needs to meet or beat the acoustic spec of the unit it replaces.
- Fogged dual-pane glass from broken seals. Coastal moisture and old aluminum frames are hard on insulated glass units. The fog means the seal failed and the inert gas has leaked out. Depending on the frame and the warranty, you may need a full replacement or just new glass. We diagnose it on site and tell you straight.
Pricing for Window Installation in Lennox, CA
A straightforward sliding window install in Lennox, where the rough opening is sound and the work is a direct replacement, typically runs $450 to $900 per window including labor. A double-hung in a standard Lennox bedroom runs $500 to $1,100 per unit. Casement windows cost more because of the hardware, typically $700 to $1,300 installed. When we need to reframe an opening, add flashing, and repair stucco, add $150 to $400 per opening depending on what we find. If the job involves matching an RSI-rated acoustic unit, the glass package itself may add $200 to $500 per window. We quote fixed pricing in writing. The number on the quote is the number on the bill. Call (888) 635-0804 for a free estimate and we’ll measure every opening in person.
We Also Serve Cities Near Lennox
While this page is written for Lennox homeowners, our crews also run regular routes through Parkway, Arden-Arcade, Ladera Heights, and Commerce. If you live just over the line in one of those communities, same standards apply: true openings, flashing on every install, and both warranty layers registered in writing.
Serving Lennox, CA - Our Local Coverage Area
We’re based in the Lennox 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 Lennox
Yes, if we modify or enlarge the rough opening, the work triggers a building permit and an inspection. Simple same-size replacements generally do not require a permit, but any structural change to framing or header work does. We pull permits when they are required and we schedule the inspection. We do not skip this step and we do not bury it in the contract as a surprise. Call (888) 635-0804 and we’ll tell you whether your specific job triggers a permit before we write the quote.
Look for a small rating sticker or manufacturer label on the window frame or sash. RSI-installed units in Lennox often carry an STC rating printed on a label from the original install, typically from the 1990s or early 2000s. If you do not see a label, check your home’s records, or ask the window company that did your last work. We can also identify the unit by measuring the glass thickness and frame construction during a free estimate. Knowing whether your home went through the program matters, because any replacement should match or beat that acoustic benchmark. Call (888) 635-0804 and we’ll check it on site.
For most Lennox homes, sound control matters more than extreme thermal performance. The coastal marine layer keeps temperatures mild year-round, so a high-performance U-factor fades in importance compared to an STC rating that cuts jet noise. A dual-pane unit with a solid STC in the mid-30s will do far more for your comfort than a triple-pane thermal window that fails the noise test. We quote the acoustic spec on paper next to the thermal spec for every Lennox job. Call (888) 635-0804 for a free estimate and we’ll walk you through both numbers.
That pitting is salt air corrosion, accelerated on west-facing elevations because the ocean is a couple miles away and the marine layer moves in most afternoons. Aluminum frames corrode from the outside in, and once the frame itself is pitted, replacing the sash alone does not solve the problem. The frame channels are compromised and the new sash will bind and leak. The fix is full window replacement with a frame that resists corrosion, and we can quote you a unit with a factory finish designed for coastal exposure. Call (888) 635-0804 and we’ll inspect the frame before you spend money on a sash.
It depends on the frame and the warranty. If the frame is sound and the window is a modern dual-pane unit, you can often replace just the insulated glass unit, which runs $200 to $450 per sash in Lennox depending on size and glass package. If the frame is corroded or the window is an older single-pane retrofit, a full replacement makes more sense than putting new glass in a failing frame. We diagnose it during the estimate and give you the cost for both paths. Call (888) 635-0804 and we’ll tell you which one applies to your window.
TruePane Windows & Doors installs, replaces, and services windows and doors in Lennox with fixed pricing, written warranties, and a Done Right Promise on every job. The phone is answered by a live person 24 hours a day, 7 days a week. Call (888) 635-0804 to schedule your free estimate.
Written by Dale Kessler, Owner at TruePane Windows & Doors, serving Lennox and surrounding communities since 2008.