What Rooms Require a Mezuzah?

The following room require a mezuzah with a berachah:

1. Entrance into a house
2. Bedroom
3. kitchen
4. dining room
5. living room / den / family room
6. playroom
7. porch
8. office / study
9. attached garage. This includes the large sliding garage door.

The following require a mezuzah without a berachah:

1. storage room
2. walk-in closet (36 sq. ft. or more)
3. doorway to staircase or hallway
4. office used exclusively for business
5. Bais Midrash
6. a room that is in between 36 sq. ft. and 64 sq. ft.
7. a room with out a door.
8. a room with a door post on the right side even if there is no doorpost on the left side.
9. detached garage

Rooms that do not require a mezuzah:

1. bathroom
2. sauna
3. doors that are used for exit only, like emergency exits or fire escapes
4. room without a roof
5. doorway less than 36″ high
6. garbage room
7. door sealed shut

This list was based in part on the list found in ‘The World of Tefillin & Mezuzos’ by Rabbi Zeev Rothschild

Special situtations:

If one is renting a motel room by the month they should put a mezuzah up. This was told to me by Reb Avraham Tzvi Wosner, Posek for the Vaad Mishmeres STaM.