When i got him 1 1/2 years ago he was 18 inches and i keep him in a 36x18x24 rabbit cage. He is around 22-23 inches now and i built a vertical cage that is 24x28x60 tall . He will be in another cage or 2 by the time he is grown at around 60-72 inches. I have seen people house these guys in a 24x24x72 as adults but they have to be let out each day, they love to roam around. Best setup would be a dog kennel , something around 10ftx20ftx6ft with a fenced in top. Depending on how cold it gets where you live, he will need a hot box where he can bask in 100-120 degrees ! UVB and UVA is a must !!