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.
I keep bathroom doors 3 4 to 1 to help the airflow.
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.
All the doors were dragging excessively on the newly carpeted floors.
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.
If the door is not clearing interior flooring the better fix is often to raise the entire door jamb and threshold.
Most manufacturers leave a 1 3 8 1 1 2 air gap on prehung doors.
He was looking for about 1 8 to 1 4 maximum.
Cutting off the door without raising the threshold may result in an improper seal.
We are moving soon and are also replacing doors in our new remodel.
If you need more room for carpet under door trim the door.
The awi gives no minimum but a maximum of over 3 4 is unacceptable.
Interior door height off floor.
Normally i cut the door bottom to leave about 1 of clearence and have never had anyone complain.
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.
Our existing floors are mainly tile but the doors swing easily over the bedroom carpet.
The space between the floor and interior doors is 3 4.
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Interior door height off floor.
Other interior doors i like to keep right around 1 2.
If equal height of doors is not critical set the hinge side of doors 1 2 off floor to tuck in carpet.
This is a good topic that will surely lead to some nice debate.
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.
Adjust the gap around the door and let the other side jam fall where it may.
There is an approximately 1 5 gap at the bottom of the doors.