My kitty is becoming too lazy

Hey,
I am worried now, my kitty (9 months old) is always sleeping for the whole day. She is becoming lazy and I want to change her. She was not like that before, she used to play balls and climb down the stairs and was restless. We had changed our home recently (it is a small house compared to the old one). Our new home had no stairs and a little bit congested. I am in doubt whether the inactiveness found in the kitty is due to sudden change. It is difficult for me to get back to the old home (some personal issues had occurred). So I planned to design a staircase (similar to the one I had in my old house ), I meant something like circular stairs for my pet. I heard from my friend that she had designed and developed some kitchenwares from the Spark Innovations, Ontario (http://www.sparkinnovations.com/) but I am not sure whether they develop a toy staircase for my pet. It will be good if someone suggests me a custom design centres. Also, suggest me some tricks to get back my kitty. I am looking forward to your replies.