Jim wrote:
Hello all,

I hope someone can help me solve my problem with my front entry door.
It is a double entry door 30 inch doors and standard height. The house
is a masonary block home. The problem is I need to replace the door
but the current door was modified to fit the rough in that is 1/4
inch to small in the vertical when the house was built. I would like
to install a prehung door, the current doors are made out of particle
board and the bottoms were cut down to allow them to fit. The frame
is also made out of wood. Both frame and doors are rotting so I need
to replace both. Any help would nice.
Thanks,

Pre-hung doors can be disassembled. Do so.

Remove 1/4" where necessary (saw, plane, whatever). Re-assemble and install.