Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
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AfterFast, Reliable Patio Door Installation Across Altadena
Patio door installation in Altadena typically costs $1,800 to $4,600 for most sliding glass doors, including the unit, labor, and haul-away of the old door. Altadena’s mix of pre-war bungalows, mid-century ranches, and modern rebuilds means measurement is everything here: we don’t order a door until we’ve opened the wall and verified the actual rough opening, header condition, and sill drainage. That’s the only way to avoid the custom-sizing surprises this city throws at you. Meridian Windows & Doors has been handling this work since 2009 as part of the Garrison Partners family, and our Patio Door Installation team knows Altadena’s housing stock cold. Call (817) 686-2228 and we’ll send a background-checked tech to measure, scope, and write you a fixed price before you spend a dollar.
Why Meridian Windows & Doors Is Altadena’s Preferred Patio Door Installation Company
We operate under The Garrison Standard, which is a written code the crew follows on every job: show up on time, protect the floors, stage materials outside, and leave the site cleaner than they found it. No exceptions. Our techs wear uniforms, carry photo ID, and pass background checks, so the person at your door in Altadena is exactly who we said we’d send.
Phones are answered by a live person around the clock, including weekends and holidays. When you call the Meridian office at (817) 686-2228, a human picks up, not a prompts tree. That matters when you’re trying to coordinate a patio door replacement around a contractor who just found rot behind the old slider.
Every project gets a written price before any work starts, and that number does not move once you approve it. If the crew opens the wall and finds conditions that change the scope, we stop, explain the new numbers in writing, and get your sign-off before touching anything else. Most homeowners in Altadena tell us that’s the single biggest difference from the contractors who burned them before.
And every installation or repair is covered by our 365-Day Done Right Promise. If something fails within a year, we return at no charge. That guarantee is in writing, with no fine print about labor exclusions. Owner Elliot Vance signs it on every single job.
Sliding Door Installation in Altadena
Sliding Door Installation in Altadena is rarely as simple as pulling an old unit and dropping in a new one. The city’s older homes, particularly the 1920s bungalows and 1950s ranches in neighborhoods up against the San Gabriels, were often framed with non-standard openings. You can’t order a stock 72-inch slider and expect it to seat properly when the rough opening is two inches narrow, which we see regularly in the Rubio Canyon and Meadows areas. The job here usually involves measuring to the actual stud, then either framing a precise fit or sizing a custom unit to the existing wall, then installing a sill pan with proper weep channels before the new door is set.
A sliding door installation in Altadena typically runs $2,200 to $4,600 for a mid-grade vinyl or fiberglass unit with low-E glass, including labor, fasteners, sealant, insulation, and disposal of the old door. Custom widths and impact-rated glazing push the number higher.
Custom Sizing for Older Rough Openings
Many pre-1950 Altadena homes were built with single-pane wood doors or early aluminum sliders, so header heights and opening widths vary from house to house. We measure the actual stud opening, check the header bearing, and order or fabricate to that number. It takes longer than a swap-out, but it’s the difference between a door that glides for twenty years and one that binds after six months.
Rot and Drainage Repairs Before Setting
Altadena’s winter runoff and clay-heavy soil settle thresholds and rot sill pans faster than homeowners expect. On older homes, we frequently find the underlying sill plate is soft or gone under a failing patio door. We replace the pan, add a jamb extension where needed, and slope the threshold to shed water away from the house before the new unit goes in.
Patio Door Repair in Altadena
Patio Door Repair in Altadena usually falls into two buckets: doors that won’t slide or latch correctly, and doors where the frame or sill has begun to fail from moisture. Homes in the north end of town, near Rubio Canyon and the foothill drainages, see the second problem more often. Our techs start with the rollers and track, then inspect the sill pan, weep holes, and jamb for water intrusion. What looks like a simple roller replacement can be the first sign of a wet sill plate, especially on 1970s aluminum sliders that were never flashed properly.
Most patio door repairs in Altadena run $180 to $600 for roller replacement, track cleaning and alignment, or latch adjustment. If the frame is compromised or the glass is fogged between panes, repair stops making sense and replacement becomes the cheaper long-term fix. We’ll tell you which one applies to your door, with numbers on paper before we do anything.
Roller, Track, and Alignment Repairs
A sliding patio door that takes a shoulder to open has failed rollers or a bent track. We replace rollers and realign the track in place, then check the strike plate and latch. This is usually a one-visit fix under the $300 mark, and it comes with our one-year written repair guarantee.
Sill Pan and Threshold Replacement
When water has been sitting against the threshold for years, the aluminum or wood underneath eventually gives. We pull the door, remove the failed sill pan, replace it with a sloped pan and positive weep drainage, then reset the door and re-caulk the exterior with sealant rated for the UV load on south and west-facing Altadena exposures.
Trusted Brands We Service in Altadena
Meridian Windows & Doors is authorized to install and service patio doors from PGT, CGI, and Therma-Tru, among others. We stock the common replacement parts Altadena homeowners need most: PGT and CGI rollers, Therma-Tru threshold kits, and a range of stainless steel track hardware. That means when a PGT slider off Lake Avenue starts grinding, we don’t have to order parts from Florida and wait two weeks. We keep what we need for the brands we install, and we know the product lines’ quirks well enough to diagnose problems from a photo before we ever drive up the 210. When you call (817) 686-2228, tell us the brand stamped on your door’s glass corner, and we’ll tell you what we can bring with us.
Common Patio Door Installation Problems We See in Altadena Homes
- Non-standard rough openings in pre-1950 homes. The 1920s bungalows and original ranch houses in Altadena were framed before dimensional lumber was standardized the way it is now, so a “standard” 6-foot patio door may not fit. We order and size to the actual opening, not to a catalog number.
- Rotted sill plates from winter runoff and no weep drainage. Altadena’s foothill drainages move a lot of water through clay soils in January and February. Older sliding doors with flat thresholds and no weep system trap that water against the framing, and the sill rots from the inside out.
- Headers not sized for impact-rated glass. A laminated impact-rated patio door can weigh twice what the original single-pane door weighed. On older homes, the existing header may not be engineered for that load. We verify the header before quoting an impact upgrade, and we’ll add a header or upgrade the jamb if the math says it’s needed.
- Improperly flashed 1970s aluminum sliders. The aluminum slider era in Altadena didn’t flash doors the way modern code requires. We routinely find missing sill flashing and unsealed jamb gaps behind these units. The fix is pulling the door and doing it right, not caulking over the problem.
Pricing for Patio Door Installation in Altadena, CA
You should know the honest numbers before you call, so here’s what patio door work actually runs in Altadena. A straightforward vinyl sliding door replacement in a standard opening runs $1,800 to $2,800 installed. A mid-grade fiberglass or premium vinyl unit with low-E insulated glass runs $2,600 to $4,200. Impact-rated patio doors from PGT or CGI run $3,500 to $5,500 for a standard width, with laminated glazing and reinforced frames. If the opening is non-standard, add $200 to $600 for custom sizing and framing. If we find rot at the sill or header during the job, that repair is scoped and priced in writing before we continue, and the number doesn’t change without your sign-off. Every project includes haul-away of the old door and a one-year written warranty. The estimate is free.
Call (817) 686-2228 and we’ll schedule a measurement. The price goes on paper before any work starts, and it does not move at the door.
We Also Serve Cities Near Altadena
Our Altadena crews also handle patio door installation and repair in neighboring communities, including Pasadena, San Marino, Sierra Madre, and South Pasadena. The housing stock and local conditions are similar in these foothill towns, and we bring the same written pricing and one-year guarantee to every job. If you’re in one of those cities, call the same number: (817) 686-2228.
Serving Altadena, CA - Our Local Coverage Area
We’re based in the Altadena 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 About Patio Door Installation in Altadena
Replacing an existing patio door in the same rough opening, without changing the structural header or the wall framing, is generally classified as a like-for-like replacement and does not require a permit in Altadena. If we’re widening the opening, moving the door, adding an impact-rated header, or altering the structural wall, that work does require a permit and an inspection. We pull permits for jobs that need them, and we schedule and pass the final inspection with you. Call (817) 686-2228 and we’ll tell you up front whether your specific project triggers the permit requirement.
A standard sliding door replacement on a standard opening takes one day, start to finish, with the crew on site from morning until midafternoon. Custom sizing, rot repair, or impact-rated glazing adds a second day, and the final inspection for permitted work typically happens within a week after the install is complete. We’ll give you a written calendar when we quote the job, and we hold to it. If a delay ever happens, you’ll hear it from us before you have to call and ask.
A sliding door installation means we are removing an old door and setting a new unit, including the sill pan, jamb work, and any framing corrections the opening requires. A patio door repair means we are fixing the existing door: rollers, track, latch, weatherstripping, or a threshold that’s begun to fail. Repairs run $180 to $600 in most cases. An installation runs $1,800 to $4,600. The best way to know which one your door needs is to call (817) 686-2228 and describe what it’s doing; we’ll give you a straight answer and a written price either way.
Yes. We install impact-rated patio doors from PGT and CGI, and both manufacturers build sliding doors with laminated glass interlayers that hold the glass in place under impact. Altadena sits in a wind zone where impact-rated glazing adds real value, and we’ll verify your existing header and jamb can carry the heavier unit before we quote it. If the framing needs reinforcement, that work is priced in writing before we order the door. The upgrade typically adds $800 to $1,500 over a standard low-E unit.
If your job required a permit, the inspector will check that the door is properly flashed, that the sill is sloped for drainage, that the opening meets egress requirements, and that the nailing pattern and header brackets match the approved plans. We meet the inspector on site, walk the job with them, and correct anything they flag, usually on the same visit. You don’t need to prepare anything. The inspection is your independent confirmation that the work was done to code, and we stand behind it with our 365-Day Done Right Promise.
Call Meridian Windows & Doors for Patio Door Installation in Altadena
When you’re ready to get a real number for your patio door, call (817) 686-2228. We’ll send a background-checked, uniformed tech to measure, scope, and price the job. The number goes on paper before any work starts, and it does not move at the door. Every installation and repair is backed by our 365-Day Done Right Promise in writing. We serve all of Altadena, from the foothill drainages to Altadena Drive, and we’ve been doing this work under The Garrison Standard since 2009. The ask is simple: schedule your free estimate. Call (817) 686-2228 today.
Written by Elliot Vance, Owner at Meridian Windows & Doors, serving Altadena since 2009.