See eggs laid, hatched and babies raised in this house. Has a built in camera (Hawk Eye Nature Cam mounted in the box) with 100 ft of cable. We put the camera in the best Bluebird House. Peek-A-Boo Ultimate Bluebird House. The outside dimension from the bottom of the house to the bottom of the entrance hole is 7 3/4 inches; however, the floor to the entrance hole from the inside of the house is 5 3/4 inches.