Hey Mike;
What kind of studio are you building, how many rooms? I built a 3 room studio. It's relatively quiet from room to room. I used a noise level meter from radio shack to check actual room variance and from the next room to see how much noise was being filtered out. We built it on a budget, I think I would have done a few things differently now to help reduce even more bleed through noise. Searching on the internet and speaking with people who have built studios gave me plenty of good ideas.
~Ange
