Barebowyer
Senior Member
Hole is typically 3"high by 4" wide for woodies. I just built three out of cedar and have four more in progress. There are lots of plans on the GON DNR site as well as the DU site and many others. Will post pics when I can and get them up....If you are going to put them on trees with no predator guards it is essential that you make the boxes long so predators cannot grab the hen off of the nest. Otherwise the depth is not needed as much, etc...