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.