Owl Boxes. This site is from England. In Michigan we have the screech owl, which requires a 3 inch hole. Box should be 10 to 30 feet off ground. Box must be water tight. We need owls to keep those little pesky chipmunks and such in check. Think owl! in your backyard.
Northern Barred Owl box Dimensions: 14 in x 14 in x 28 in. Materials & constrn: cedar shingles over pine plank, plywood roof, screwed. Instructions here (48 lb!) Tree attachment: screwed through inside back panel.