Hi there Rav, I had a question. I recently rented a house that has an attic. I do not ever intend to use it. The only entrance to the attic is located in the bathroom, where through a small cabinet-like opening you climb upstairs. does it require a mezuzah ? thanks!
The fact that you do not plan to use the attic would not suffice as a reason NOT to put a mezzuzah, since its part of the house.
On the other hand from your subsequent description I would doubt the attic has a room size of 8 foot x 8 foot and therefore would be exempt.
If it is in fact 8x8 I would need more info on the doorway/cabinet size opening. Also when you say it opens to stairs, is there any type of door frame at the top of the stairs?
No it does not require a mezuzah.