IMPORTANT: Pre-hung doors are measured from outside of jamb to outside of jamb.
For example, a 38x96" door will include the frame in this measurement, so the door slab will measure less than 38".
To determine your rough opening, you may need to remove the trim/casing around your current door.
Recommended rough opening should be 1" wider/taller than door size ordered.
Please consult with your contractor or builder before purchasing in order to get accurate measurements!