What NOT to Put Inside Your Walls and Why? | Clash Of Clans | TEC Clashzz

• Army Camps, Barracks, Spell Factory and Laboratory. Why? Because these buildings have no real purpose when you're being raided (other than a percentage to gain Trophies/3 stars) to keep them within your valuable wall space.

• Upgrading-Defensive Buildings. When Defensive Buildings are being upgraded, they cannot function or assist in defending your base. Instead, (especially in the core of your base) they may just prove to be detrimental, attracting troops, particularly those that target Defensive Buildings. Switching these with other buildings (I would use Barracks instead of Gold Mines or Elixir Collectors, for reasons on below posts) may distract these defense-targeting troops, such as Golem/Golemites, Hog Riders, Lava Hound/Lava Pups, or Giants! Letting these upgrading-Defensive Buildings occupy the interior of your base does not help you at all. Though many consider this trivial, you have to remember that every little thing counts; It could be the difference between a devastating raid or a successful defense!

• Gold Mines, Elixir Collectors (and potentially Dark Elixir Drills, though see previous section). Why? If you normally play every day, there shouldn't be all that many resources in your collectors. Therefore there's not really a need to keep them inside your walls, even if you don't play very often. In addition, Goblins will be attracted to interior Gold Mines and Elixir Collectors, making it easier for the raider to access your inner Gold Storages or Elixir Storages. If you are a hardcore farmer you may want to consider keeping these within your walls, but it is strongly advised to use your walls for more important buildings such as Cannons or other defenses. Perhaps the only time you should consider keeping collectors inside your walls is if you are using a boost on them.

• Put your Gold Mines and Elixir Collectors at a slight distance from the wall and have either a Mortar or Archer Tower inside the wall. Put a small Bomb at a slight distance from where you put your Gold Mines and Elixir Collectors. This will distract any opponent that usually deploys an Archer in order to lure your Clan Castle troops towards attacking troops in order to kill them. The key is to have as little areas as possible on your base from which the opponent can lure your Clan Castle troops far enough from your defenses. Experienced attackers will deploy their troops slowly in selective parts of your base.

• Builder's Huts: Why? Builder's Huts are basically just a hut your Builder sleeps in when he's not working on something. It has no defensive capability whatsoever, so there's no reason to put it inside your walls. One exception would be to place one temporarily inside your walls to take space of at least 3x3 that you're saving for another building. Another exception is to protect these buildings making a 1 star 50% win more difficult for your opponents.

• Decorations: Why? Because they just waste space you could have used for something important, and could actually create a back door for enemies to place troops behind your defenses if the area they are in is at least 3x3 (see paragraph below).

Other Wall Info
Obstacles (trees, bushes, stones, etc.) cannot be used as walls or barriers! Troops can be placed directly on top of them, in front of them, or behind them! The same goes for Decorations (flags, torches, etc.) and Traps (Bombs, Spring Traps, etc.) and even Hidden Teslas. None of these (with the exception of Hidden Teslas, which are hidden buildings) actually have hit points like your buildings do either. Neither do they count as building space when you're under attack (even the Hidden Teslas, until they are revealed). For example, if you have a large area of at least 3x3 with only decorations or traps within that area, enemy troops can be placed directly into the area where those Decorations, Traps or Obstacles are during an attack on your village.