New windows and doors improve comfort, cut energy bills and add long-term value to your home. Westlight Windows San Diego 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 San Diego Owner’s Guide
Westlight Windows San Diego stocks and installs Therma-Tru-compatible sliding and patio door parts, and most repairs in San Diego run $385 – $1,150 installed depending on the component, the door series, and what we find when we take the panel off. Same-week scheduling is standard for us, and we carry the common failure parts on the truck so a single visit usually gets it done. The way most San Diego homeowners discover a part has failed is subtle at first: the door starts dragging, or the handle feels loose, or you notice a whistle of air near the strike plate on a windy afternoon. By the time it’s obvious, the roller or the weatherstrip has usually been worn down for months.
Key Takeaways:
- Therma-Tru patio doors use brand-specific rollers and multipoint lock parts; generic big-box hardware often doesn’t fit
- Most sliding door repairs in San Diego run $385 – $1,150 installed with written pricing before we start
- Rollers and weatherstripping fail first in coastal air; multipoint locks fail most often from misalignment
- We stock common Therma-Tru-compatible parts on the truck for same-visit replacement
- We’re an independent service provider, not affiliated with Therma-Tru, but we install their parts lines every week
Which Therma-Tru Models This Applies To
Therma-Tru’s sliding patio door lineup breaks into a few distinct series, and the parts are not interchangeable across all of them. The Smooth-Star and Classic-Craft patio doors use a roller assembly sized for a 1-3/4 inch thick panel, while the newer Pulse and Slim-Line series use a slimmer profile roller that sits in a narrower bottom rail. If you don’t know which series you have, look for the factory label: it’s usually a white or silver sticker on the top edge of the sliding panel, or stamped into the hinge-side jamb on older units. The label will show a series name and a manufacturing code we can use to pull the exact spec.
One gotcha we see regularly in San Diego homes built in the 1990s and early 2000s: builders installed Therma-Tru entry doors but paired them with off-brand patio sliders, so the homeowner assumes the slider is Therma-Tru when it isn’t. Before you order a part online, send us a photo of the label and the hardware. OEM Therma-Tru parts carry a higher price tag than quality aftermarket equivalents, and for wear items like rollers and weatherstripping, a good aftermarket part often performs just as well for less money. For multipoint lock gearboxes and strike plates, we lean OEM because the tolerance is tighter and a slightly off aftermarket gearbox can bind up within a season.
Signs Your Therma-Tru Sliding & Patio Door Is Failing
- Door drags or takes real effort to slide. The rollers have worn flat or the bearings have seized. In coastal San Diego, fine salt air accelerates bearing corrosion, so Mission Beach and Point Loma doors tend to eat rollers faster than inland homes in Rancho Bernardo or Santee.
- Handle feels loose or the lock lever won’t fully throw. The multipoint lock gearbox has worn teeth or the door panel has sagged out of alignment. Forcing the lever when it resists is how you snap the gearbox internally, which doubles the repair cost.
- You can see daylight or feel a draft at the bottom corner. The weatherstrip has compressed or torn, and the panel may need a height adjustment. San Diego’s May Gray and June Gloom months put constant moisture against old weatherstrip, which shortens its life.
- Door rattles in the frame when it’s fully closed, especially in wind. The rollers are out of adjustment or the locking points aren’t engaging the strike plates. A rattling door is also a sign the frame may have shifted, which is common in older Mission Hills bungalows where foundation settling is routine.
- Condensation between the glass panes. The insulated glass unit has lost its seal. This is a sealed-unit replacement, not a drying job. In San Diego’s temperature swings, a failed seal will fog up every morning until it’s replaced.
Replacement Cost & What’s Included
| Repair Type | Typical Installed Price in San Diego | What’s Included |
|---|---|---|
| Roller replacement (both panels) | $385 – $640 | New rollers, panel removal and re-hang, track cleaning, height adjustment |
| Weatherstrip replacement (full perimeter) | $260 – $430 | New compression weatherstrip, threshold seal, alignment check |
| Multipoint lock gearbox + handle | $480 – $780 | New gearbox, handle set, strike plate adjustment, lock testing |
| Insulated glass unit (seal failure) | $650 – $1,150 | New dual-pane IGU, glazing replacement, disposal of old unit |
Price is driven by the door series, whether we need OEM or aftermarket parts, and how much adjustment the frame needs once the new part is in. Every quote is written before any work starts, line by line. If the frame is out of square, we’ll tell you what that costs separately, not bury it in a revised invoice at the door. Our workmanship warranty covers the parts we install, and the Kingswell Guarantee puts the return-visit terms in writing: if the repair fails within the guarantee period, we come back and fix it at no charge.
DIY or Call Us?
Roller, weatherstrip, and handle replacement on a Therma-Tru slider is not high-risk work, and if you’re handy with a screwdriver and have patience, you can probably do a roller swap on a smooth-running door over a weekend. The honest caveat: the sliding panel on a Therma-Tru patio door weighs anywhere from 90 to 150 pounds depending on glass package. Lifting it out and setting it back into the track by yourself is how people pinch fingers, strain backs, and crack glass. If you’re working alone, don’t pull the panel. That’s not a sales pitch, it’s just the reality of a heavy door.
Where DIY genuinely goes wrong is with multipoint locks and frame alignment. The gearbox and lock rods need to be timed correctly, and if the panel has settled even a quarter inch, the new lock will bind and wear out prematurely. We’ve replaced more than a few homeowner-installed gearboxes that seized within six months because the door was never properly adjusted. If you want to try the easy stuff, go for it. If the lock is involved or the door is dragging badly, call us at (619) 793-3829 and we’ll get it right the first visit.
FAQs
Rollers typically last 7 – 12 years in San Diego, but coastal homes within a mile of the water often need replacement in 5 – 8 years because salt air corrodes bearings faster. Multipoint lock gearboxes usually last 12 – 20 years if the door stays aligned, and insulated glass units typically fail between 10 and 18 years depending on sun exposure. Call (619) 793-3829 if your door is showing any of the failure signs and you want an honest read on what’s left in it.
No. Once a roller’s bearing has worn or seized, the roller needs to come out and a new one needs to go in. There’s no reliable way to rebuild a nylon door roller, and the cost of trying is time you won’t get back. The good news is roller replacement is one of the more affordable Therma-Tru repairs we do, and we stock common sizes on the truck. Call (619) 793-3829 for an exact quote with written pricing.
Most roller, weatherstrip, and handle replacements take 60 – 90 minutes once we’re on site. A multipoint lock replacement usually runs 90 minutes to two hours, and an insulated glass unit swap takes about two hours including clean-up and disposal. If you need parts we don’t have on the truck, we’ll give you a straight answer on ordering time before we leave.
We stock the most common Therma-Tru-compatible rollers, weatherstrips, and handle sets on the truck, and we carry parts for PGT, CGI, and CWS as well since those brands are common in San Diego coastal communities. If the specific part for your series isn’t on hand, we’ll have you a written price and an honest lead time before anything gets ordered, and you won’t pay until the part is in front of you and the work is scheduled. Call (619) 793-3829 and we’ll check stock while you’re on the phone.
Yes. Most of the Therma-Tru patio door repairs we do in San Diego are on doors other contractors installed, many of them builder-grade from the 1990s and 2000s. Westlight Windows San Diego is an independent service provider and not affiliated with Therma-Tru, but we install their parts and hardware every week. The only requirement is the same one Owen Satterfield has kept since he started in this trade: measure it right, say what it costs, show up when you said you would, the rest takes care of itself.
When you’re ready, call (619) 793-3829 and ask for Owen or one of the crew. We’ll set a time to look at the door, give you a written quote with real numbers, and fix it right the first time. Estimates are free, and nobody gets a revised invoice at the door.
Written by Owen Satterfield, Owner, Westlight Windows San Diego at Westlight Windows San Diego, serving San Diego and nearby areas.
Six Reasons Homeowners Choose Westlight Windows San Diego
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.