It depends on how big he is and how you feel about it.
He could certainly move now, but he'd probably be okay for another 2 to 3 months in his current set-up as well.
I moved Kitty into a 2x2x4 enclosure at 4 months old and he did well.
Make sure you establish permanent stations for dripper, feed cup and basking light, so he can learn where to find food and water and heat at all times.
I had the big enclosure set-up and running for a couple months before the move. This allowed me to get the dripper right and moniter temps/ adjust lights, etc.
basically get everything as perfect as possible before the move. This is a luxury afforded to owners of one cham and I highly recommend it.
-Brad