Enclosure size for a juvenile

[Dev_Man]

Hey everyone, i'm thinking about buying myself a columbian boa and was wondering what size enclosure i could keep them in up to a year old? or maybe even 6 months...I bought my first snake a ball python a month ago now i'm hooked and i want something with a more impressive size. As he grows i'll be making him a custom enclosure so that is not a worry Thanks for the help!