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 Sliding & Patio Doors: The Los Angeles Owner’s Guide
If your Therma-Tru sliding or patio door is sticking, dragging, or letting a draft through, you’re in the right place. We stock and install Therma-Tru-compatible sliding and patio door parts across Los Angeles, and most roller, track, and weatherstripping replacements run between $180 and $650 installed depending on the door series and what’s worn. Most owners discover the problem the hard way: the door grinds against the track, the lock no longer lines up, or the panel suddenly feels twice as heavy as it did last spring.
Which Therma-Tru Models This Applies To
Therma-Tru builds sliding patio doors across a few distinct series, and the part you need depends on which one you have. The Smooth-Star series uses a fiberglass skin over a wood frame and takes a different roller housing than the lower-profile Slim-Line sliders. The Tru-Defense series, designed for impact zones, has a reinforced multi-point lock that is not interchangeable with the standard single-point lock on older models. If you can find the label, look for it on the vertical edge of the sliding panel near the lock bore. The label gives you the series name and, often, the manufacturing date. No label? We can identify the door by measuring the stile width and the roller housing depth at your free estimate. For Therma-Tru doors specifically, we always recommend OEM rollers over aftermarket when they’re available. The factory rollers are matched to the track profile and panel weight, and a generic roller from a big-box store often sits a few millimeters too tall or too shallow, which turns a $40 fix into a track replacement. Aftermarket weatherstripping is a different story: several quality manufacturers make Therma-Tru-compatible bulb seals and fin sweeps that perform as well as the original at a better price, and we stock both.
Signs Your Therma-Tru Sliding & Patio Doors Is Failing
- The door hesitates or jumps when you slide it. That’s almost always a flat-spotted roller or debris scored into the track. The roller bearing wears unevenly in Los Angeles because fine dust from dry summers works its way into the housing, and once one roller seizes, the panel’s weight shifts onto the remaining rollers and wears them faster.
- You can see daylight at the corner where the panels meet. The interlock weatherstripping has compressed or torn. This piece sees the most friction on every open-and-close cycle, and after five to eight years of daily use in a busy L.A. household, it stops sealing.
- The lock no longer lines up. On Therma-Tru multi-point systems, the panel has settled a few millimeters as a roller wore down. Forcing the lock is how the gearbox strips, and a stripped multi-point lock is a $350+ replacement instead of a $30 roller swap.
- The door is harder to open in the afternoon than in the morning. This is a classic Southern California signature: the aluminum track expands in direct sun on a west-facing door and bows slightly. When the track bows, a panel that glided in the cool morning binds by 3 p.m. A replacement track with proper thermal breaks fixes it.
- You feel air moving around the frame even when the door is closed and locked. The sill gasket or the header seal has failed, or the panel dropped enough to leave a hairline gap at the top. It’s not just comfort: that gap is how the June marine layer and August dust both get inside.
Replacement Cost & What’s Included
In Los Angeles, expect to pay $180 to $310 for a roller replacement on a Therma-Tru slider, including the parts and labor for both panels. A full weatherstripping refresh – interlock seal, sill gasket, header seal, and fin sweep – typically runs $240 to $420. A new multi-point lock assembly is the big one: $380 to $650 installed, because the lock has to be matched to the door’s hand and the keeper positions adjusted so the deadbolts throw without resistance. Here’s how it breaks down:
- Roller replacement (both panels): $180 – $310 installed
- Track repair or replacement: $220 – $480 installed
- Full weatherstripping kit: $240 – $420 installed
- Multi-point lock replacement: $380 – $650 installed
- Panel realignment (labor only): $150 – $250
Every one of those numbers is the price you’d get in writing before we begin, per the Kingswell Guarantee. No revised invoice at the door, no “we found something else while we were in there” surprise. The parts are warrantied by the manufacturer, and our labor carries the 365-Day Done Right Promise: if the repair fails within a year, we return and make it right at no charge.
DIY or Call Us?
Sliding door rollers and weatherstripping are not dangerous to work on the way a torsion spring is, but there are two honest cautions. First, a loaded Therma-Tru panel with tempered glass can weigh 150 to 200 pounds, and lifting it out of the track alone is how people strain backs and chip frames. Second, the side jamb screws on Therma-Tru sliders are often covered by trim caps that crack if pried wrong. If you want to do anything yourself, start by vacuuming the track and cleaning the rollers with a dry cloth: half the “roller failures” we see in Los Angeles are just dust packed into the bearing. If the door still grinds after a clean track, call us at (213) 810-3461. We’ll measure, match, and install in one visit.
FAQs
In Los Angeles, most Therma-Tru rollers last 6 to 10 years depending on sun exposure and how often the door cycles. Rollers on south- and west-facing doors wear faster because the heat dries the bearing grease and the dust works in behind it. If your door is older than six years and starting to drag, it’s usually time. Call (213) 810-3461 and we’ll tell you over the phone whether it sounds like rollers or something simpler.
In our experience, roughly 8 out of 10 Therma-Tru patio doors can be repaired with a new roller, seal, or lock at a fraction of replacement cost. The door only needs replacing when the panel frame itself is rotted, severely warped, or the glass seal has failed and fogging is permanent. We’ll tell you straight which camp you’re in at the estimate.
Most Therma-Tru roller and weatherstripping work takes one to two hours, including realignment and a full cycle test. Multi-point lock replacements run closer to two hours because the keeper positions need to be dialed in. You’ll get a committed arrival window before we show up.
We stock Therma-Tru-compatible rollers, weatherstripping, and lock hardware for the most common series on our trucks, and we also carry parts for PGT, CGI, and CWS doors. If your door is an uncommon series, we order the part and schedule the install once it arrives, usually within a few days. Call (213) 810-3461 for a free estimate and we’ll confirm availability for your specific door.
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.