See also: Walls The chances that you will be able to find the perfect base will be slim to none, so when you find something suitable for the size of your group (if you have one), you will need to find materials to "fortify" the location. Major base modification, although necessary, can attract zombies and bandits so your modifications should be able to stop both. Remember modification should add-on to existing structures. Below is a brief description of some of the most basic and available of materials.