According to international code standards interior doors the ones that allow passage from one room to another are required to be at least 80 in height and 32 wide.
How to hinge one door to another.
You just get a bag of shims place the door in its closed position and then use the shims to hold it in place.
Ask this old house carpenter nathan gilbert helps general contractor tom silva change the swing of an entry door subscribe to this old house.
You will need to place a thin piece of similar wood in the side of the door for each unused hinge slot for a good appearance.
Likewise you should place wood in the old door frame to fill in the hinge slots.
If you re hanging new doors onto old frames you will need to cut or mortise new hinges onto the door.
To make your doorway accessible a 36 door is ideal.
Slide the hinge pins into place and remove the blocks from the door.
This will let you check the the new hinge plates will be in just the right spot.
Closet doors on the other hand do not have the same code requirements and come in a range of sizes.
Hold the door in place using blocks under the bottom to support it if necessary.
Now it was time to mortise out the hinges.
Line up the two hinge plates so that the ones on the door match the ones in the jamb.