Things You'll Need
Instructions
Lay one piece of solid wood or exterior-grade plywood, minimum of 15 mm thick and 4 inches by 4 inches, down on your work surface, and hold a second board against one side.
Attach the side board into the bottom board with galvanized nails and a hammer. Hammer one nail on each end of the side board, and three in the middle, spaced out evenly across the board.
Nail the other three boards on the side of the bottom board in the same manner. Nail the side boards to each other.
Locate a tree in your yard away from bird feeders and where people congregate. Nail the nesting box against the trunk, preferably resting on one branch, as if it were a nest.