[header] How to build a cat condo [title] Find a cardboard box large enough to fit your cat. [step] If there is a large cardboard box that your cat already likes to sleep in, consider using that. [title] Lay the box down on its side. 
[step] If the box has a top part that folds down, cut it off using a box cutter. You can also fold the flaps inward and secure them with glue.