How To Measure For A Barn Door Size. (in this example the total width is 41″). The width of your opening, the height of your opening from the floor to the top of the opening, the space between the top of the opening to the ceiling, and the width of the right and left walls of your opening.
The start of the tape should be at the opening. Add 1″ to 2″ per door for overlap depending on privacy needs. Measure the inside of the opening across for width.
Add 1″ to 2″ per door for overlap depending on privacy needs.
Another choice for sliding doors are barn doors, which have been growing in popularity. Then, measure the height by running your tape measure along your door from. Most barn door sizes fall anywhere between 36” wide (on the shorter side) by 96” tall (on the longer side). In instances where casing is present we recommend building the door to the same size as the opening + casing + 3.