I let my one Burm go around my house when i am with her but not to many of my other large snake do that. To leave them out when you are not there is not to SMART. They could get into something that could harm them or even kill them. I have Water Dragons and i know that they lick and taste everything so you might want to think about that.
There is so many things around the house that would not be good for your water dragon to get into.
NEW LINE REPTILE
Specializing in Large Pythons
Home of the "GIANTS"