Install the last row of laminate flooring stopping 1 2 inch from the bottom edge of the patio doors.
Laminate under door trim.
I made a quick video on how to undercut door jambs for laminate flooring it is a diy job most people could undertake themselves if the have some basic tools.
You can deal with door jambs by trimming the molding that conceals the.
The 1 2 inch gap is for the doorway only.
Note that you will leave the standard 1 4 inch expansion gap on either side of the doors.
If there s a gap under your door casing and also a gap between two rooms under a door where two different installations of laminate flooring join you can install t molding to hide both gaps.
If your flooring runs parallel with the door you ll likely have only one piece of laminate to trim.