well mine is a 3 x 2 with an upstairs and a divided area (if tha makes sense I must get sorted with a photo!) I also used one as a sort of step to rest the ramp on and i covered it in vet bed that can be removed. I always covered the top level with them so it has a roof so really like I say it does depend on how many piggies are going in it and jusy what design you fancy, hope this has sort of helped I know its hard without seeing a photo, but I really enjoyed making mine ;D