Create a design for your letter box on paper. A basic design is a wooden box with a slit in the top, mounted on a post or attached to a wall.
Add the dimensions of the letter box on the diagram. The standard letter box slot in the U.S measures 12 inches by 2 inches. The box itself needs to be big enough to hold all your mail.
Cut the pieces of wood for the box to size. It needs four equal rectangular sides, plus two rectangular pieces of wood -- one for each end.
Saw the letter box slot into one of the sides.
Paint the wooden pieces in a color of your choice. Personalize your letter box to fit your requirements. Include your house name or number on the front.
Leave the pieces of wood to dry and then nail them together, but do not use nails to attach the top rectangle.
Attach the lid of the letter box with a hinge.
Dig a 2-foot deep hole in the ground where you want to position the letterbox. Place the post in the hole and fill it with cement so that it is secure.
Nail the letter box on top of the post.