Design an artificial chimney — or shaft — that is at least 8 feet deep and closed off at the bottom. The inside diameter should be at least 11 inches.
An inside diameter closer to 2 feet will make your chimney swift habitat much easier to clean and maintain.
Cut 2-inch by 4-inch boards and trim pieces to match the height of the chimney swift tower. The width of the 5/8-inch siding should be cut to match the width of the inside walls of the chimney swift tower.
The width of the 5/8-inch plywood should match the width of the outside of the chimney. The length of the siding and the plywood should be trimmed to match the height of the chimney.
Screw together — using 2-1/2-inch screws — two vertical 2-inch by 4-inch boards placed perpendicularly to each other. Each pair of 2-inch by 4-inch boards will act as a corner bracket for the plywood and siding.
Attach 5/8-inch siding to the inside corner of the 2-inch by 4-inch boards with 1-1/4-inch screws. Be sure to use siding that has grooves cut at regular intervals so that the chimney swifts will have something to hold on to.
Attach the siding so that the grooves are facing the inside of the chimney and are horizontal to the ground.
Fasten the plywood to the outside of the corners created by the 2-inch by 4-inch boards with 1-1/4-inch screws. Attach the trim boards to the outside corners of the chimney swift habitat using finish nails.
Stabilize your chimney swift tower by attaching it to the north or east side of another structure. The top of your tower should extend approximately 5 feet above any adjacent structure.
Attach a shade — constructed from 5/8-inch plywood — to the top of the tower to prevent overheating. This is important for chimney swift towers that are less than 12 feet in height.
Finish the outside of your chimney swift tower with paint or varnish. Leave the inside unfinished.