Hello how may I help you? I live in apartment and have a cat. How much space does my cat need? A cat should be fine in an apartment as long as it has vertical space to climb How high should the ceiling be? at least ten feet That's tall. It's a big cat, weighs about 30 pounds. What should he climb? You can install carpeted shelves on your wall for him. Good idea. Does he need floor space to run around? some, but if he has enough vertical space he will be fine in a smaller apartment Awesome, thank you sure thing, good luck!