That size cage would be fine. It will take years for your boa to outgrow it assuming it ever did. A 10' boa is not common especially when you actually get a measuring tape next to it lol. And it would take 10 year or longer for it to reach that size assuming you arent power feeding or overfeeding it which 90% of people do anyways.
And not only are 10' boas rare, they are even more rare if they are BCI. The big boas are BCC and Peruvians to be specific. And BCC grow SLOW.
As for a caging general guideline, you want the minimum size of the cage to be length+width is equal to the length of the snake.
To give you an example, here are AP T25 cages next to T8 cages which are 4x2. The AP cages are technically 72x30x18 and I have them add a shelf which is 10" wide across the whole back of the cage which adds floor space so if you factor that in, you are looking at 72x40x18. A shelf is the cheapest, easiest way to add floor space to a cage plus snakes love the height. And you can see there is plenty of room. The first cage is my 7' retic, second is 5.5' sunglow bci and third is 6.5' Colombian bci.
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