These wren birdhouses are easy to make. Six pieces make this wren birdhouse. The two sides, roof, front and back, and bottom. I used a brad gun to tack the pieces together, but you could use screws. It has a 1’ hole, drilled with my drill press and spade bit.
Here’s a photo of them,
The wood is cedar, the wood will never go bad.
The hole has a screw in it, you stick your screwdriver in the hole, and screw the screw in the tree.