This box is set at an angle with a letterbox opening and a astro turf perch on the top for the owl to land on. 

There is an access hole at the front allowing for cleaning.

The perch on the top can be used by the owls to hunt from.

The box is made of 9mm exterior plywood, the roof is felted and there is a astro turf perch on the apex.

The boxes are painted with a water based wood preservative on the outside only

A wooden fixing bracket comes with the box

The size of the Tawny Owl Box is 
610mm High
320mm Wide
Letter Box Opening