We have a corner fireplace requiring a front and a side door.  The side door didn’t fit.  Our installer, Dave, checked the measurements and called the manufacturer.  They had the correct dimensions but cut the door incorrectly.  They made a new door, which was then installed.  Dave was very meticulous in his work, which we really appreciated.  It is very rare to find this kind of work ethic these days.  He also did a great job cleaning up after he finished the installs.