Homestudy Renew or Start over?

Hi Fellow Tennessean's. Does anyone know how to ressurrect their homestudy? Are they good for two years or one? I am not sure if we need to or not, but I don't feel comfortable calling our agency to get the scoop, so I thought I could ask Y'all :) We adopted last year, but our original home study started in December 02. I seem to remember it was several thousand dollars, so I'm wondering if we need to pay again if we wanted to adopt in the future. I was hoping there's an annual fee to keep it active ? Thanks in advance.