It took two of us 3 1/2 hours to construct this cattery. There are four holes that were not predrilled that should have been, and one piece that was mislabeled in the directions, otherwise we had no problems. An electric screwdriver would have been useful. Our two cats aren't crazy about it, as we used to let them roam freely until one of them got into a fenced in yard and the two huskies that live there mauled him.