I just took a quick look at some of standards and regulations governing door undercut which is the distance between a door and finished floor as opposed to clearance which is door to sub floor.
Interior door clearance to floor.
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Most manufacturers leave a 1 3 8 1 1 2 air gap on prehung doors.
The space between the floor and interior doors is 3 4.
All the doors were dragging excessively on the newly carpeted floors.
There is an approximately 1 5 gap at the bottom of the doors.
Our existing floors are mainly tile but the doors swing easily over the bedroom carpet.
If you need more room for carpet under door trim the door.
Interior door height off floor.
If you decide to cut off an exterior door make sure you have a plan for sealing the bottom of the door against the threshold when the door is closed.
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Other interior doors i like to keep right around 1 2.
We are moving soon and are also replacing doors in our new remodel.
With this clearance in mind if you install a door lets say over concrete floor and sills are limited to 1 2 in height to comply with ada when you add 1 2 sill you still have 7 8 1 gap for air circulation.
If equal height of doors is not critical set the hinge side of doors 1 2 off floor to tuck in carpet.
Normally i cut the door bottom to leave about 1 of clearence and have never had anyone complain.
I definitely like to keep that as a minimum for closets maybe even going to 5 8 figuring they might get too stale inside otherwise.
Interior door height off floor.
The awi gives no minimum but a maximum of over 3 4 is unacceptable.
Interior door clearance to floor.
I keep bathroom doors 3 4 to 1 to help the airflow.
My contractor just hung our fancy dancy un painted solid wood door slabs in my 100 year old house with solid hardwood floors throughout.
I think it is too big and think a 1 4 1 2 gap would accommodate any unevenness in our floors and allow us to use area rugs.
Cutting off the door without raising the threshold may result in an improper seal.
However yesterday when my client arrived home he immediately called me to ask why i cut so much off the door bottoms.
If the door is not clearing interior flooring the better fix is often to raise the entire door jamb and threshold.