Numerous designs dictate a six or seven inch hole.
Plans for a barn owl box. All cavity nesting birds including barn owls prefer an entrance hole that is just large enough for them to squeeze through but too small for larger animals that might prey on the eggs or chicks. Cavity nesters recovery program cnrp build a barn owl box. Owl nest box placement. Ideal buildings for barn owl nestboxes are.
Consider placement when creating owl boxes so that you can include whatever attachments are necessary. To construct and install a fully functioning barn owl nest box that can be used for nesting broods why build a barn owl box. Take the time to install your owl box appropriately. With an opening or hole at least 3 metres above ground level which overlooks open countryside.
Barn owls have been the subjects of wonder wisdom magical accoutrements and folklore for ages. Where the nestbox access hole is visible to an owl from the most likely. At least 4 metres high. This is far too large and may cause barn owls to shun such a nest box.
The barn owl trust a leading authority on barn owls recommends increasing their nest box dimensions by 50 for the american barn owl equating to a floor dimension of 30 x 24 5 ft2 and a minimum of 10 ft3 for a box that is 24 deep. How to build a barn owl box. Where the nestbox can be positioned 3 metres above the ground. A divider inside the entrance allows the adult barn owls inside but restricts larger predators such as raccoons and opossums from entering the nesting box the nesting box is designed for placement inside of a building or against the side of a tree or pole.
In the ideal owl nest box placement the box will be located near an open field so that the owls can glide directly into the box from hunting.