Any enclosed space that s at least 6 5 ft.
Mezuzah on doorway.
If there are several doorways leading into a room each doorway requires its own.
This is done to accommodate the variant opinions of rashi and of his grandson rabbeinu tam as to whether it should be placed vertically rashi or horizontally rabbeinu tam and also to imply that god and the torah which the mezuzah symbolizes are.
Where the doorway is wide enough many ashkenazi jews tilt the mezuzah so that the top slants toward the room into which the door opens.
A doorway that requires a mezuzah is only one that that has two doorposts and a lintel connecting the doorposts on top.
Any room that has two doorposts and an overhead lintel requires a mezuzah so one should check with a rabbi.
If these conditions do not exist a competent rabbi should be consulted to determine whether or not that entryway requires a mezuzah.
A mezuzah is affixed to every doorway in your home or office that leads into a proper room except for the bathroom.
Bathrooms closets laundry room boiler room and so forth however do not require a mezuzah.
Ashkenazim place the mezuzah at a slant toward the main room.
Place the mezuzah on the upper one third of the doorpost.
A mezuzah should be fixed to the doorpost of ever living space in the house not just the entrance door.
It should go about 2 3 of the way up the doorpost and be affixed diagonally with the top of the mezuzah slanting in towards the house or the entrance of.
This includes vestibules hallways large walk in closets etc.
Place the mezuzah on the right side of the doorpost as you enter the main room e g on the right side of the door as you enter your home on the right side of the door as you enter a bedroom etc.
As long as a door can be used as an entrance and exit a mezuzah should be affixed to the doorpost.