How many cats are too many?
I would like to get an opinion as to how many cats are too many to have in a house, as indoor only cats.
My house is two story with 4 bedrooms upstairs and 2 bathrooms upstairs, plus the hallway. They would have access to all of those rooms. Downstairs I have 3 fairly large rooms (living, dining and family room), a bathroom, the kitchen and two hallways. There is a bedroom downstairs, but that's my elderly father's room and it's rather messy so I'm not sure the cats would even want to go in there. The basement is completely off limits.
I have and am trying to make the rooms more cat friendly. I have some sort of perch in most of the windows. In one bedroom there is a bunk bed and the cats like to get on the top. In another bedroom I have it setup so that the bookcases go around the room so the cats can walk on the tops of the bookcases. Basically, I try to make everything suitable and enjoyable for the cats even if it means inconveniencing myself.
Unfortunately, I don't have many places for litterboxes. I currently have 6 of them. I don't think I could squeeze another one in anywhere. I know the litterbox rule (one for each cat, plus one extra) but don't know if that's really necessary if they're kept clean.
I have found that my current cats each seem to have their own room. They spend most of their time in that room but they do go to other rooms or areas of the house at certain times of the day.
I think the key thing is to make sure that all the cats get along with each other. So how many cats would be too many for my house? Any opinions? I'm sure there are at least a few people who have or had more than 10 cats in the house, so I'd like to hear from you.