Choose your wood: Choose a 6in x 1in plank of suitable untreated wood for the bird box. As seen in the picture, the Men’s Shed use white deal because of its availability, but there are other timbers suitable for the job, such as larch. The wood should not be treated so as not to interfere with the welfare of the animal when it is inside the box. The bird boxes should be made similar to the design set out by the Department.