Patio Door Installation Cost in LA (2026)

"Patio door" used to mean one thing in LA: a 6- or 8-foot aluminum two-panel slider in the back wall of a tract house. In 2026 it's a category, not a product. We treat patio door as the umbrella term for any door that opens to your outdoor space — sliding, French, bifold, multi-slide pocket, lift-and-slide. The configuration you pick changes the price by an order of magnitude, and the conversation has to start there before any number is real.

Every band in this guide is what we actually charge in 2026, validated against what our peer LA installers are quoting on the same scopes. All-in pricing: door, install labor, threshold pan flashing, permits, Title 24 documentation, sales tax, disposal of the old unit. Not included: structural header upsizing if the new opening exceeds the old (priced as a written change order after the engineer's calc), or rough-opening rot found on tear-out.

If you take one thing from this guide, take this: on patio doors the threshold detail and the header sizing are where the money goes wrong, not the door brand. A $4,000 Milgard slider installed correctly outlasts a $9,000 Andersen installed badly, and we tear out enough failed installs to mean it.

Opening size and structural work. Replace-in-kind into an existing 6-foot slider opening needs no header work — drop in the new unit, flash, trim, done. The moment you widen the opening (most multi-slide and bifold installs do this), you're into a structural permit, an engineer's stamped header calc, and an LVL or steel beam sized for the load above. On a single-story rear wall that's a $1,200–$2,500 add. On a two-story carrying wall it's $4,000–$9,000 and a separate framing day. We bid the structural work line-item separate from the door so the math is honest.

Threshold detail. Standard threshold sits about 1-1/2" proud of the slab, gives you generous water-management margin, and is what we recommend for any ground-level patio without a deep overhang. ADA-compliant low-profile threshold (1/2" max rise) is required for accessibility scopes and looks better on interior-grade transitions to a covered patio — but it leaves less dam height, so the pan flashing detail has to be flawless. The ADA threshold itself adds $200–$600 depending on door system; the precision install adds another $300–$500 in labor.

Screen system. Standard sliders ship with a built-in screen panel — included. French doors take a Phantom or Andersen retractable screen that hides in the jamb, $400–$900 per opening. Multi-slide and bifold systems need a separate retractable screen wall on its own track parallel to the door — $1,200–$2,800 depending on width. In Encino, Sherman Oaks, and any river-adjacent neighborhood with mosquito pressure, the screen isn't optional and we quote it in the base.

Smart locks and hardware. Multi-point locks are standard on French and multi-slide — included. Smart-lock upgrades (Yale, August, Schlage Encode integrated with the multi-point) add $400–$900 per opening and require a hardwired or battery setup the homeowner has to maintain. We install them when asked but rarely recommend them on the primary patio door — outdoor exposure is hard on the electronics and the failure mode is being locked out of your own backyard.

Glass package. Title 24 baseline (Low-E with argon, U-factor 0.30, SHGC 0.25) is included in every band above. Tempered glass is mandatory in patio doors by code — included. Laminated glass for sound abatement (LAX flight path, PCH frontage) or wildfire-zone Chapter 7A compliance adds $400–$1,200 per opening depending on door size. Triple-pane is rarely worth it in LA's mild climate; we install it about twice a year for studio-adjacent acoustic projects.