There is no longer a reason to have a "Dolby Certified Room:.
That was for Film Print Masters. Film is dead.
Now that DCP's are what are being delivered you do not need to have a certified room. That is not to say that you don't need a well designed room that is built around well know sound acoustical principles.
Villagesound, you don't state where you are located.
Here is the best person for you to contact:
Bruce Black of MediaRooms Technology:
Here is a link:
http://www.mediaroomstech.com/
Tell him I sent you. He can consult for you. The money you save from doing it right is well worth it. He is very reasonable!