In a multi-cat home, floor space isn't the main constraint — vertical access is. Cats naturally organise territory by height as much as by area, and a single-level setup can quietly create tension that looks like unrelated behaviour problems.
Height is territory
Cats use elevation to signal status and claim space without direct confrontation — a cat on a higher perch generally feels more secure than one on the floor. In a one-cat household this barely matters. In a multi-cat household, if there's only one attractive high spot, cats end up competing for it, and the ones who lose out often show it as stress behaviour rather than obvious fighting.
What this looks like in practice
Signs worth watching for include one cat monopolising the only tall perch, another cat avoiding a room entirely, or increased spraying/scratching in cats that didn't do this before. These are often read as "personality" or "bad behaviour" issues when the real driver is a shortage of vertical options relative to the number of cats.
A rough guide
A commonly cited starting point is at least as many resting/perching spots as you have cats, spread across different heights and, ideally, different rooms — not all clustered on one tower. See managing a multi-cat household with large breeds and can two large cats share one cat tower for more detail, and browse multi-cat-suited towers in the Maine Coon Collection.
FAQ
How do I know if my cats need more vertical space?
Watch for one cat dominating the only high perch, another avoiding certain rooms, or new stress behaviours like spraying — these often point to a shortage of vertical options rather than a personality clash.
Does one large tower solve this for multiple cats?
Sometimes, if it has enough separate platforms — but spreading vertical options across more than one piece of furniture in different rooms often works better than one large shared structure.