Build a tall trio of birdhouses for indoor decorating. Or, insert them over 4"x4" posts outdoors as homes for the birds.
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These instructions are for the 4' birdhouse. To make the others, add 12" or 24" to the lengths of the front, back, and sides.
Cut the front, back, and sides about 1" longer than shown so you can trim them to length after cutting the miters and bevels on top (Tall Birdhouse Project Diagram and Cutting List). Rip (cut with the grain) the front and back to 4" wide. Then cut the roof to length and 6-7/8" wide. Sand the roof with 120-grit sandpaper and set it aside.
You can square and straighten the edges by cutting a little off each edge.
Stack the front and back with the bottom ends flush, and miter-cut the top ends to length at a 45-degree angle. Separate the boards and determine which way the roof will slant to find the front.
On the front, draw a centerline about 8" down from the slanted top end, then mark the line at 4" and 6-1/2" from the top end. Drill a 1-1/2" hole for the opening and a 1/2" hole to insert a twig for a perch.
Cut 45-degree bevels on the top ends of both sides (A, B). Then stack the front and back (C) and cut 45-degree miters on the top ends. Dry-assemble the parts so the bevels of the sides align with the miters on the front and back. Mark the length of the longer side (B) and mark the other three parts so the ends are flush. Then cut all the parts to length.
Glue, clamp, and nail first one side and then the other to the front and back -- insetting the front and back 1/8" from the edges of the sides -- and let dry. Press wood filler into the nail holes, let dry, and sand smooth.
If your boards aren't perfectly straight, fill small gaps with paintable caulk and remove any extra from the surfaces.
On the underside of the roof, mask off where it will join with the front, back, and sides. Prime and paint the roof and the rest of the birdhouse, then remove the tape.
If you're planning to keep these birdhouses indoors, now is a good opportunity to use some of the leftover paint from earlier projects. Otherwise, choose three complementary colors that provide an accent for the room where they'll be displayed.
Glue and nail the roof to the birdhouse. Fill the holes and touch up the paint as needed. Insert a twig (or dowel) in the 1/2" hole.
Optional: To make your birdhouse functional for outdoor use, check for buried utilities and dig holes to accept 4"x4" posts. Cut each post so the top end stops about 4" from the 1-1/2" hole. Slip the birdhouse over the post and drive screws into two adjoining faces to hold it in place.