So I have a two year old male pet-only boa that I adopted as an adult from another keeper. He's very slender like a bullsnake (as opposed to my fatty fat ball pythons) and four....maybe four and a half feet long. I'm making the blueprints for caging and I'm trying to guess his "final" cage size. Right now he's in a 3x2x1 Boaphile Plastics cage for quarantine.

So here are my issues: 1) I have no idea how much more I should expect him to grow. 4-4.5 and 1.5 pounds at two. I figure he'll have two years to put on a lot of growth, but having never owned a boa I don't know if I should expect him to put on a lot more length. Ideas?

2) I keep hearing conflicting info regarding how to judge cage size. I'm striking a balance between the needs of my animals and my space needs, so while I have no interested in a minimum I also can't afford to give them excessively large cages. When it comes to a BCI I've been told: square footage should equal the length of the snake. I've also been told I should build an 18" or even a 24" high cage. Mine spends almost all his time in his hides and is most outgoing out of this cage, but I don't know if that's his personality or if he really would use a taller cage.

Help? I don't want to cramp anyone, but I also don't want to build space they don't use.