Hello how may I help you? I need some advice I would be happy to help! What do you need to know? How much space do I need in my apartment for my cat? You need roughly 1000 square feet for your cat. What if I get a second cat? For a second time, you would need roughly 1500 square feet or more, depending on how well the cats get along with each other. Great, thans You are very welcome. Have a good day You too! :)