Design the brick plan and make a blueprint plan. Decide how large to make the kiln and mark the dimensions on the blueprint. A kiln 2 feet tall and 2 feet wide will hold several pieces at once. The kiln should be at least 1 cubic foot. Place a metal sheet under the kiln.
Put on safety goggles. Wear old clothing that you won't mind getting stained or ruined.
Make a level base for the kiln by digging either a few inches into the ground or a few feet. Make the area the size of the base of the kiln. For example, for a 2-cubic-foot kiln, the base is 2 feet. All of the kiln can be placed underground, which gives more insulation. Use a level to make sure the base is level.
Put bricks in a perfect square covering the base. Do not mortar these bricks, but place them close together.
Build a brick wall on top of the base on one side by staggering the bricks. Mark with a pencil any bricks that need to be cut to fit. The length of the brick wall should be match the length of the base, which will also be the height of the wall. Use a miter saw to cut the bricks as needed. Use high-heat mortar in between the bricks to attach them. Repeat on the other three sides.
Place the control box on the outside. Drill holes for the coils to pass through into the kiln. Put the coils around the inside of the kiln. Cover the kiln with a metal sheet as the roof of the structure.