due to their large size & active style, i'd go w/ no less than 4'x 4'x 2' as these snakes are superior display animals & the payoff will be well worth it. here are 2 cages i used, a converted china closet & then when they outgrew that i built them an ark. lol! it's 6'x 5'x 2', practically a flight cage for a macaw but they really enjoyed it & so did i. good luck!