This catio is already assembled and ready for your cat to use to be outside in a safe environment. It has a back door that can be placed in front of a window for your cat to access the catio on their own. It is in perfect condition and all doors and perches work. You will need a pickup truck to move it due to the size. If you are brave, you can partially disassemble it to fit in something smaller - you can even borrow my drill!