To correctly determine the size of a rough opening for double or french doors measure the size of each door.
Typical size of french doors.
Standard french doors measure 80 tall by 36 wide per door especially for french doors that lead to an exterior area.
To get the total width multiply the width of each door by 2 and add 2 inches.
So if each door measures 30 inches wide the width of the rough opening should be 62 inches.
Many door manufacturers produce stock doors that measure up to 8 in height and can be anywhere from 24 to 42 wide.
The frame is leveled squared and checked for plumb.
The jamb with or without doors attached is positioned in the opening.
The sizes that your french doors come in will be set by the manufacturer but they are generally between 30 and 72 inches wide per door.
Design options for french doors include window types glass types material of door color and size.
And generally are available in 2 inch increments.
Installation of french doors is similar to standard passage doors.
Interior french doors indoor french doors 60 x 80 in.
Many companies will only sell french doors as pairs.
The standard thickness measures at 1 for interior french double doors.