Blue Tit Nest Boxes
For blue tits, a nest box with a small circular hole of 28mm is best. You should mount the box between 2 and 4 metres off of the ground - preferably on a wall or tree.
Nest Boxes for Blue Tits
Ideally, face the box between North and East to avoid the wet and sun. Tilt the box forward slightly when you hang it so that the roof can keep the rain out.