Clash of Clans Wiki

O.T.T.O Hut5.png
"Home and charging dock for Master Builder's latest invention! Once fully upgraded, O.T.T.O becomes an additional builder in Builder Base and enables the Master Builder to freely travel between the two villages!"

O.T.T.O Hut1.png O.T.T.O Hut2.png O.T.T.O Hut3.png O.T.T.O Hut4.png O.T.T.O Hut5.png
Level 1 Level 2 Level 3 Level 4 Level 5


  • The O.T.T.O Hut is a building unlocked at Builder Hall level 9. The O.T.T.O Hut does nothing when initially built, and will only serve as a distraction defensive-wise then. However, it houses the O.T.T.O which can only become active when the O.T.T.O Hut is upgraded to level 5.
  • Upgrading the O.T.T.O Hut does not take time or resources, but instead, a certain prerequisite must be completed (and the Master Builder must also be available to upgrade the building). To upgrade the O.T.T.O Hut to level 5, four such prerequisites must be satisfied.
    • To upgrade to level 2, you need to gear up a Cannon, Archer Tower and a Mortar in the Home Village. This requires a level 7 Cannon, a level 10 Archer Tower and a level 8 Mortar respectively in the Home Village, and a level 4 Double Cannon, a level 6 Archer Tower, and a level 8 Multi Mortar in the Builder Base.
    • To upgrade to level 3, you need to upgrade the Cannon Cart to level 18 (which requires Star Laboratory level 9).
    • To upgrade to level 4, you need to upgrade the Mega Tesla to level 9.
    • To upgrade to level 5, you need to upgrade the Battle Machine to level 30.
  • Once the O.T.T.O Hut is upgraded to level 5, O.T.T.O is activated and functions as an additional builder in the Builder Base. The Master Builder can then freely travel between the Home Village and Builder Base as the player so chooses, whenever he is not working on a building and can function as an extra Builder in either base as long as you have the Master Builder's Hut built in the Home Village.

Upgrade Differences

  • The O.T.TO Hut undergoes significant visual changes at all levels.
  • When initially constructed, the O.T.TO Hut is a stone platform with wood planks hammered on as a base. There is a loose ramp made out of wooden planks. There is a hammer and some nails, along with a pipe.
  • At level 2, a stone table is added and the pipe was now attached to the table. O.T.T.O's wheel is placed on the side of the table
  • At level 3, the table gains a wooden extension which covers the pipe away. O.T.T.O's eye, arm and wind-up screw are placed on the table while the wheel is moved to the floor
  • At level 4, a structure resembling a builder hut is added on the platform, concealing everything inside. There is a slot resembling an electric outlet with a spanner next to it
  • At level 5, a coil with an orb is added to the top of the hut, which resembles the coil on O.T.T.O's hat.


Patch Description
June 18, 2019 Added the O.T.T.O Hut, with 5 levels.
O.T.T.O Hut1.png O.T.T.O Hut2.png O.T.T.O Hut3.png O.T.T.O Hut4.png O.T.T.O Hut5.png
March 30, 2020 The visual boost effect for an O.T.T.O Hut can now be seen when the Clock Tower is active.
April 12, 2021 Fixed a bug where progress can wrongly be credited towards O.T.T.O tasks.


  • Since the level 2 O.T.T.O Hut requires gearing up all 3 buildings currently available to be geared up, the upgrade effectively requires players to have Town Hall level 10 or above, since the Mortar gear up requires the Mortar to be level 8 (which requires TH10).
  • The O.T.T.O Hut has the same amount of hitpoints and Build Time as a Builder's Hut from the Home Village.
  • A question was posted on the Supercell forum about what O.T.T.O stand for and Darian the Supercell community manager replied with Organizatonal [sic] Tidying Trimmer Organizer, Orbital Tedium Tending Orderly, and Outstanding Tolerable Tributary Oscillator. The post can be found here.
  • The O.T.T.O Hut is the only building that requires other buildings to be upgraded to a certain level or modified to be upgraded, unlike all the other buildings, which take time and cost resources.
  • The O.T.T.O Hut and the Battle Machine Altar are the buildings in Builder Base that have the least amount of hitpoints.
  • The O.T.T.O Hut is the only building in Builder Base to have the fewest levels, which is 5.
  • The O.T.T.O Hut is the second extra Builder Hut that doesn’t cost gems (the other is the Master Builder's Hut on the main Home Village).

Icon Descriptions

Icon Info.pngTapping this icon displays information about the O.T.T.O Hut, such as Hitpoints and information regarding the tasks needed to upgrade the Hut.
Icon Upgrade.pngTapping this icon also opens up the information screen, and allows the O.T.T.O Hut to be upgraded to the next level, if you have completed the relevant task and if the Master Builder is free. When the O.T.T.O Hut is at maximum level, this icon is not shown.
Icon Travel.pngTapping this icon moves the Master Builder to the Home Village. This icon is only shown when the O.T.T.O Hut is at maximum level and the Master Builder's Hut has been placed in the Home Village.
Icon NoTravel.pngTapping this icon informs you that the Master Builder is already in the Home Village, or that the Master Builder's Hut has not been placed. This icon is only shown when the O.T.T.O Hut is at maximum level.
Builder Hall Level 1 2 3 4 5 6 7 8 9
Number Available 0 0 0 0 0 0 0 0 1
Size Size
Hitpoints Hitpoints Build Cost Builder Gold Build Time Time
250 100,000 None
Upgrade Requirements
Level 2 Gear Up all 3 buildings: Cannon, Archer Tower, Mortar
Level 3 Upgrade Cannon Cart to level 18
Level 4 Upgrade Mega Tesla to level 9
Level 5 Upgrade Battle Machine to level 30
Builder Base Buildings
Defensive Buildings CannonDouble CannonArcher TowerHidden TeslaFirecrackersCrusherGuard PostAir BombsMulti MortarRoasterGiant CannonMega TeslaLava LauncherWalls
Traps: Push TrapSpring TrapMineMega Mine
Resource Buildings Builder Hall (Magic Items) • Gold MineElixir CollectorGold StorageElixir StorageGem MineO.T.T.O Hut
Army Buildings Builder BarracksArmy CampStar LaboratoryBattle Machine Altar
Other Buildings BoatDecorationsObstaclesClock Tower