I'm not a hundred percent sure what you are saying but if you can make the walls the same wall to reduce the number of brushes. Otherwise it can be left as is.
hm i was makin something n i got a few weird shaped rooms now i got all kinds of empty spaces in between them, gonna have to fill em up i guess, would it cause much of a problem if i left em as they are? like how much of an effect on the vis would it cause.