French, sliding, multi-slide configs. The opening that turns your backyard into a room. Andersen, Marvin, Pella, Milgard certified. Lifetime install warranty across 30 LA cities.
The aluminum slider your house was built with isn't what your contractor will quote you today. The category has split three ways and the structural assumptions have changed with it.
Ten years ago a patio door was a 6-foot or 8-foot aluminum two-panel slider, set in a 2x4 wall, framed with a single 4x6 header. That was the standard from the 1960s through roughly 2015 and most LA tract homes still have it. The frame conducts heat, the rollers seize after a decade of stucco dust, and the single-pane glass is the leakiest 50 sq ft of your envelope.
What replaced it isn't one product — it's three. Sliders went vinyl and fiberglass with thermally broken frames and tandem rollers that actually last. French doors (hinged, with an active and inactive panel) became the mid-market answer for anyone who wanted the indoor-outdoor look without committing to a pocket. And multi-slide systems — three, four, or six panels that stack or pocket into the wall — went from $40,000 architectural specials to a $9,000–$25,000 line item on every Encino and Studio City backyard remodel.
The structural piece is what most homeowners don't see. A 16-foot multi-slide opening needs an LVL or steel header sized by a structural engineer, not a contractor's guess. CRC R602.7 and LA's amended seismic detailing both apply, and the threshold has to be detailed as a water-management assembly — pan flashing, end dams, weeps to daylight — because that opening is now the lowest point on your wall. Half the multi-slide warranty failures we get called to repair are threshold problems, not the door itself.
All-in pricing per door (labor, permits, threshold pan, disposal). Multi-slide pricing scales with panel count and pocket vs stack configuration.
Sliders win on three metrics: cost, footprint, and weather. A two-panel slider needs zero floor clearance for a swing arc, seals tighter than a hinged door against the marine layer, and runs about half the price of a comparable French door. The trade-off is that you only ever get half the opening — one panel is fixed. If your indoor-outdoor moment is moving a tray of food to a dining table on the patio, that's plenty. If it's hosting twenty people with the door wide open, it isn't.
French doors are the right call when you want the look of a pre-1960 LA home (Spanish Colonial, Mediterranean, Craftsman) or when the opening is narrow enough that a multi-slide doesn't pencil. Active-and-inactive configuration gives you a full panel of clear opening on the regular-use side, and the inactive panel unlatches for moving furniture. Andersen 400 Frenchwood is the workhorse here — wood interior, fiberglass exterior, and a multi-point lock that doesn't sag.
Multi-slide is for backyard remodels where the wall is coming out anyway. Three panels stacking covers 12 feet, four panels pocket to 16, six panels pocket to 24. Once you're past 16 feet you're in stamped-engineering territory and the price climbs fast — but for a properly designed great-room-to-patio opening, nothing else does what it does. Marvin Ultimate is our default; Andersen Big Doors is the alternative if the budget is there.
We've torn out enough failed installs to map the patterns. Each of these is a callback we get from another contractor's customer.
Every step has a deliverable, a name, and a fixed date. If we miss a date, we credit you $250 — written into your contract.
"We ripped the back wall out for a great room remodel and had three contractors quote the multi-slide. Red Stag was the only one who brought a structural calc to the bid meeting. Marvin 16-footer, four panels, pockets clean. Came in at $22,400 against an $18k–$31k spread."
"Original 1962 aluminum slider replaced with an Andersen Frenchwood. Theo flagged that the existing header was a 4x6 and we were swapping for a heavier door — pulled a permit, sistered an LVL, did it right. Old contractor would have just dropped it in."
"Brentwood beach-side, salt air kills hardware. They specced stainless track on the Marvin and used 316 fasteners on the threshold. Two years in, zero corrosion. Other contractors quoted standard galvanized."
Same crew, same trucks, same 45-minute drive if a roller binds in 2031.
The patio door market in Los Angeles has diversified significantly over the last decade. Where it was once almost entirely 2-panel sliding glass doors (SGDs), we now install roughly equal numbers of traditional sliders, multi-slide systems, and French/swing patio doors. The right choice depends on the opening width, the view, the budget, and how the space is used.
Traditional sliding glass doors (2-panel, 6'–12' wide). The baseline. One panel slides behind the other — simple operation, proven weather-sealing, wide product availability from Milgard, Anlin, Marvin, and Andersen. Appropriate for most single-story patio connections. Weakness: the fixed panel blocks roughly half the opening, and the track requires regular cleaning to operate smoothly. We use Milgard Tuscany or Marvin Elevate as our primary slider specs.
Multi-slide and pocket-slide systems (12'–30'+ wide). Three or more panels that stack behind each other or pocket into the wall, achieving 70–90% clear opening. The dominant product in California indoor-outdoor living rooms. Andersen 100 Series multi-slide, Marvin Signature Multi-Slide, and Milgard Thermally Improved Aluminum are our most-specified multi-slide systems. Requires structural assessment of the opening width — headers typically need upgrading on spans over 16 feet.
French/swing patio doors. Two hinged panels that swing in or out. Better weather performance than sliders in coastal locations, more architecturally appropriate for traditional-style homes (Craftsman, Spanish Colonial, Tudor). Limited to about 10 feet of combined width before the swing arc becomes impractical. Always paired with a proper threshold and drain detail at the sill.
Threshold and drainage. The single most common patio door failure mode is water infiltration at the sill. We install a sloped sill pan with drain legs as standard on all patio door projects — it's not optional regardless of the product specification. The pan intercepts any water that gets past the threshold and drains it to the exterior before it contacts the subfloor.
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