For that you need to subtract at least a 1 8th of an inch for clearance.
Extending the length of a door.
Remove the door by pulling out the hinge pins and lay it on a pair of padded sawhorses.
How to fix a too short door.
Draw vertical lines on one wall with a straightedge and pencil that are 6 inches or more from each outer edge of the door opening.
Years ago we removed all the carpeting in the house.
Measure the distance between the bottom of the door and the floor.
Carefully cut off the door at the pencil mark to get a clean square edge.
Now we have a big gap from door to floor.
If there is carpet flooring remove a 1 4 inch space from the total measurement for easement from the carpet to the door bottom.
To seal out weather insects and dirt it is important to properly size your door.
The lines should extend from the floor to the ceiling.
Place it in the center of the door at the bottom.
The filler piece will be 1 1 2 in.
Any way to extend the length of the door replacing all the doors in the house would be to expensive.
Check all the way across in case one area is uneven in measurement.
Clearance under the door.
Measure where the door meets the floor when it is closed.
Tall and you ll want at least 1 2 in.
When you can see daylight under your door it is not the right size and needs to be.
Make sure the door is closed and take out the measuring tape.