You don't want a Burm pissing all over your floors!!! You'll have a very hard time keeping her husbandry right in a 12 x 12 room without spending a whole lot of money...
Just get a nice 8 foot Sentec cage and the Burm will be happier because you will be able to control her environment properly!
http://sentecreptilecages.com/features.php?id=1