The barn (more like a shed) is 16 ft in length and 8 ft in width. There are 2 windows on each side and a AC in the back. We keep the climate at 70 degrees during the summer and 55 degrees in the winter to help with their reproduction system. I have 23 cages, which is probably all that will fit in the shed. The cages are 18" by 18" and there are 2 that are 24" by 36" which I use for breeding. We are still in the process of finishing the electricity and putting in the instilation.