Despite being one of the smallest rabbit breeds, Polish rabbits are surprisingly active and need more room than their compact size might suggest. The minimum enclosure size for a single Polish rabbit should be at least four times the rabbit's fully stretched length in each direction, which works out to roughly 24 by 36 inches as an absolute floor. However, that minimum assumes the rabbit also receives several hours of supervised free-roaming time outside the enclosure each day. Without regular exercise time, the enclosure should be significantly larger.
The trend in rabbit housing has moved decisively toward exercise pens and free-roaming setups over traditional cages, and for good reason. A Polish rabbit confined to a small cage for most of the day will develop behavioral problems — repetitive bar chewing, excessive thumping, aggression during handling — and is at higher risk for obesity, muscle atrophy, and skeletal issues like sore hocks. An exercise pen that provides eight to twelve square feet of floor space, combined with daily free-roaming time in a rabbit-proofed room, gives a Polish rabbit the movement it needs to stay physically and mentally healthy.
Vertical space matters as well. Polish rabbits are agile and enjoy hopping onto elevated platforms and perching on low shelves. The enclosure should be tall enough for the rabbit to stand fully upright on its hind legs without its ears touching the ceiling — at least 18 inches, though taller is better if you plan to include ramps or platforms. Wire-top cages that sit only 14 inches high are too cramped for anything beyond temporary transport.
If you are setting up a free-roaming arrangement where the rabbit has access to an entire room or a large section of a room, the enclosure serves as a home base — a place with food, water, litter box, and a hiding spot where the rabbit can retreat when it wants security. In this case, a smaller pen or open-topped habitat works well as long as the rabbit can enter and exit freely during supervised hours.