New windows and doors improve comfort, cut energy bills and add long-term value to your home. Westlight Windows Los Angeles pairs proven product lines with our own installing crews for lasting performance - and a price we put in writing.
Choose your installer
The unit is half the job - the install is the other half. Our own background-checked crews measure, set, seal and insulate every opening, and they know the lines we quote inside and out because they install them every week.
Select the right products
Compare styles, materials and glass packages side by side until the fit is right for your rooms, your budget and your goals. The product-line comparison below is the place to start.
Prepare your home for install
Before install day we walk you through a short checklist - furniture pulled back, treatments down, a clear path to each opening - so install day is watch-it-happen, not scramble.
Compare the Lines We Quote
Every project is priced on the same lines, side by side - the price indicators below are relative, and your consultant shows exact numbers on your actual openings.
PGTThe line Florida homeowners arrive naming - the most Miami-Dade certifications in the industry$$$
- More Miami-Dade NOA certifications than any other line we quote
- WinGuard, EnergyVue and ClassicVue Max systems built for every wind zone
- 99% on-time delivery keeps your install date on the calendar
CGIThe heavyweight impact line$$$$$
- Large-missile impact ratings for the strictest wind zones
- Architectural-grade aluminum with commercial-depth frames
- The line we quote when protection is the whole point
CWSThe Florida value pick$$
- Vinyl systems built in Florida for Florida codes
- Strong energy packages at the friendliest price point
- The smart start for whole-home replacements on a budget
ESWSlim lines, big glass$$$$
- Narrow-sightline aluminum for modern elevations
- Oversized openings and floor-to-ceiling glass
- Impact-rated without the bunker look
ECOThe aluminum impact workhorse$$$
- Miami-built aluminum impact systems
- A strong price-to-protection ratio for coastal homes
- Proven inventory lines with short lead times
Therma-Tru Window Replacement: The Los Angeles Owner’s Guide
Therma-Tru window replacement in Los Angeles typically runs $450 – $1,400 per window installed, depending on the glass package and frame condition. We stock compatibility hardware for most Therma-Tru series on our trucks, so a failed window usually gets replaced same-week, not same-month. Most owners discover the problem when a window that used to close tight suddenly lets in a draft, or when the sash no longer stays up without a fight. Here’s how to know what you’re dealing with and what it will actually cost to fix.
Which Therma-Tru Models This Applies To
Therma-Tru built its name on entry doors, but the window lines that came through their catalog in the past two decades include the SlimLine, Classic-Craft-adjacent, and Tru-Defense series, and a decent number of them were installed in Los Angeles homes built between 1995 and 2015. The compatibility gotcha worth knowing: two Therma-Tru windows can look identical from the inside and take completely different balance hardware. The model sticker lives on the top or side edge of the sash, and it includes a manufacturing code that tells us the exact spring or block-and-tackle system the window was built with. If the sticker is gone, we measure the sash thickness and balance shoe profile and match from there. Therma-Tru no longer manufactures replacement windows under their own label, so when we say “Therma-Tru replacement,” we mean one of two honest paths: rebuilding the existing sash with matched hardware and a new insulated glass unit, or replacing the full window with a current-manufacturer unit sized to the existing rough opening. We’re an independent provider and not affiliated with Therma-Tru, which matters because it means we can tell you straight when rebuilding beats replacing, without a brand agenda behind the answer.
Signs Your Therma-Tru Window Replacement Is Failing
- The sash drops when you let go. In most Therma-Tru double-hungs, that’s a tired block-and-tackle or spiral balance. The part is replaceable, but after roughly 15 to 20 years of Los Angeles heat cycling, the nylon housing often cracks and the whole assembly needs to go.
- Fog or haze between the glass panes. The insulated glass unit’s edge seal has failed. In coastal Los Angeles zones, salt air accelerates this on west-facing windows; we see units fail five to seven years earlier near the beach than in the Valley.
- The lock won’t engage or the sash sits crooked. Warped frame or a stripped lock bore, usually from years of forcing a sagging sash shut. Forcing it further bends the lock keeper and sometimes cracks the sash corner joint.
- You can feel air moving around the window edges. The weatherstripping has compressed past usefulness, or the frame has settled out of square. Los Angeles homes on expansive soil see this often, especially in places like Mid-City and Baldwin Hills where minor foundation shift is common.
- Visible rot or soft wood under the sill. Once water gets behind the exterior trim, it sits there. Therma-Tru frames with wood substrates don’t recover from that; the rot keeps spreading until the sill is opened up and rebuilt.
Replacement Cost & What’s Included
Full window replacement in Los Angeles with a mid-range vinyl or fiberglass unit runs $850 – $1,400 per window installed. A hardware-and-glass rebuild, where we retain the existing sound frame and swap in a fresh sash, balance system, and insulated glass, lands between $450 and $750 per window. The higher end of the range accounts for stucco interiors, second-story access, and lead-safe containment on pre-1978 Los Angeles homes, all of which add real labor hours. Every quote from Westlight Windows Los Angeles is a written, line-item price with the labor and materials separated, and it’s the price that holds. No revised invoice at the door. The install is covered by our workmanship warranty, and if a balance or seal fails within the guarantee period, we return and correct it at no charge. That return visit is automatic, not something you have to negotiate for. The Kingswell Guarantee puts all of this in writing before the first screw turns.
DIY or Call Us?
What’s safe to check yourself: whether the sash is square in the frame, whether the latches engage, and whether you can see a model label on the sash edge. What we’d stop you from doing: prying out a balance cover without releasing the tension, cutting out an old insulated glass unit with a utility knife at eye level, or working on a second-story sash without scaffolding. A falling double-hung sash carries real weight, and a razor-sharp glass edge under pressure is not the place to learn a new skill. Most failed Therma-Tru parts in Los Angeles homes are replaceable, and identifying the exact part before opening the wall is ninety percent of the job. Call us at (213) 810-3461 and describe what the window is doing. A live person answers, and we can usually tell you over the phone whether you’re looking at a rebuild or a replacement.
FAQs
Plan on 15 to 25 years for the frame and 10 to 15 years for the insulated glass seal, with coastal Los Angeles zones taking the bottom of both ranges and inland cities like Woodland Hills and Pasadena taking the top. We see most hardware failures between years 12 and 18. A window that’s fogging or dropping at year 10 is early; at year 20 it’s on schedule. Call (213) 810-3461 for us to take a look and tell you which timeline your window is on.
Yes, in a lot of cases. If the frame is square and dry, a sash rebuild with new balances, weatherstripping, and a fresh insulated glass unit brings the window back to near-new for roughly half the cost of full replacement. If the frame shows rot, sag, or water damage, rebuilding it usually costs more than replacing the whole unit. Call (213) 810-3461 and we’ll give you a straight answer on which applies to yours.
A single-window sash rebuild or hardware swap typically takes a technician about 90 minutes on site, from setup to cleanup. A full frame replacement takes about three to four hours per window, including stucco or drywall repair around the opening. We leave the site with the old material hauled off and the floor swept. Call (213) 810-3461 to schedule a free estimate and we’ll give you a written arrival window and a written price.
We stock the most common Therma-Tru balance systems, lock sets, and weatherstripping profiles on our trucks, along with PGT, CGI, and CWS hardware for the other lines we service. If your window needs a less common part, we order it same-week through our supply accounts. We’ll confirm before you pay anything whether the part is on the truck or coming from a warehouse.
Owen Satterfield grew up in the Palms neighborhood of Los Angeles, close enough to the 405 that he still jokes he can tune his sleep to freeway noise. He learned the trade hands-on through the construction technology program at Los Angeles Trade-Technical College, where an instructor drilled into him that a window is only as good as the install around it. Owen has been measuring, framing, and hanging windows and doors across the Los Angeles basin for going on two decades, and he’s built a reputation for being the guy who actually shows up when he says he will and leaves a job site cleaner than he found it. A window should work as hard as the house it’s in. If your Therma-Tru window isn’t holding up its end, we’ll tell you exactly what it needs and what it costs. Call (213) 810-3461 for a free estimate.
Written by Owen Satterfield, Owner, Westlight Windows Los Angeles at Westlight Windows Los Angeles, serving Los Angeles and nearby areas.
Six Reasons Homeowners Choose Westlight Windows Los Angeles
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.