Minecraft wiki entry for Witch_farming, associated text: The basic design starts as most Witch farms do, marking out the spawning platforms. Start 1 block below the lowest Witch hut blocks, which will be log blocks that mark the corners of the hut, and place 1 of your building blocks of choice on each corner exactly 1 block diagonally away from the log blocks towards the outside of the hut. Space the next spawn platform two blocks above the first and put permanent corner blocks there. Do the same thing for the third spawn platform. Due to the spawning mechanics of Witch huts you cannot place any more spawning platforms. Now that you have the basic corners of each spawn platform, carefully take down the witch hut proper with your axe and pickaxe. If you knock out any of the spawning area corner blocks by mistake, as long as the bottom-most one is there, you can measure and replace them easily. Once the Witch hut is taken down you are left with the markers for the Witch hut spawnable area for Witches. Remove 4 blocks around the hut's original area down to the level of the first level of the farm to make space for the farm's circuitry. This will make things easier to work with later.