Best Builder Hall Level 9 Trophy/Defense Base Layouts for COC Clash of Clans 2025

Upgrading to Builder Hall level 9 represents the pinnacle of strategic development in the "classic" Builder Base, unlocking the final core troop and a devastating new defense. More importantly, BH9 is the level where players can finally complete the series of challenges to unlock O.T.T.O, who becomes a permanent sixth builder in the Home Village—a monumental achievement. The upgrade costs 3,800,000 Builder Gold and takes 4 days to complete. The Builder Hall itself reaches its most formidable appearance, featuring a large, glowing forge and intricate gold trim.

Key Unlocks: A Volcanic Defense and a Master Builder's Hut

BH9 introduces a defense that reshapes the battlefield and the ultimate prize for your Builder Base efforts.

• Lava Launcher (x1): The signature defense of BH9. The Lava Launcher lobs molten projectiles over a very long range, leaving a patch of burning ground upon impact that continuously damages any ground troops that stand in it. While it cannot target air troops, it is incredibly effective at area denial and slowly roasting high-health ground armies and heroes. It costs 4,200,000 Builder Gold and takes 3 days to build.
• O.T.T.O Hut (x1): This building replaces the broken-down Master Builder's Hut. Once fully upgraded to level 5, and after completing a series of four specific challenges, you unlock O.T.T.O. He can then take over as the primary builder in the Builder Base, freeing up the Master Builder to travel to the Home Village as a permanent sixth builder.
• Additional Mega Tesla (x1): A second Mega Tesla becomes available, drastically increasing your base's burst damage potential against both ground and air threats.
• Additional Walls (x10 segments): The final set of walls for BH9, crucial for protecting your new Lava Launcher and optimizing defenses across both stages of your base.

New Offensive Potential: The High-Flying Hog

Your offensive arsenal is completed with a versatile troop that stuns defenses upon impact.

• Hog Glider: Unlocked by upgrading the Builder Barracks to level 9, the Hog Glider is a unique troop where a Hog Rider flies a glider directly towards the nearest defense. Upon reaching its target, the rider drops down, briefly stunning the defense, and then acts as a regular Hog Rider, attacking nearby defenses. The glider itself crashes, dealing minor area damage. This troop excels at disabling key single-target defenses like a Mega Tesla or Roaster.

The O.T.T.O Challenge

Unlocking the sixth builder is a major goal at BH9. It requires you to complete four specific tasks via the O.T.T.O Hut:

1. Gear-Up three specific buildings in the Home Village (Cannon, Archer Tower, Mortar).
2. Upgrade the Cannon Cart troop to level 18.
3. Upgrade the Mega Tesla to level 9.
4. Upgrade the Battle Machine to level 30.

Maximum Upgrade Levels at Builder Hall 9

BH9 is a long and rewarding level, with many upgrades required to max out the base.

• Defenses:
• All defenses (except X-Bow): Can be upgraded to Level 9. This includes the Cannon, Double Cannon, Archer Tower, Firecrackers, Crusher, Guard Post, Air Bombs, Multi-Mortar, Roaster, Giant Cannon, and Mega Tesla.
• Lava Launcher: Can be upgraded to Level 9.
• X-Bow: Can be upgraded to Level 4.
• Walls: Can be upgraded to Level 9.
• All Traps: Can be upgraded to Level 6.
• Resource & Support Buildings:
• Elixir Collector: Can be upgraded to Level 9.
• Gold Storage: Can be upgraded to Level 9.
• Elixir Storage: Can be upgraded to Level 9.
• Gem Mine: Can be upgraded to Level 9.
• Clock Tower: Can be upgraded to Level 9.
• O.T.T.O Hut: Can be upgraded to Level 5.
• Army & Hero Buildings:
• Builder Barracks: Can be upgraded to Level 9 (to unlock the Hog Glider).
• Star Laboratory: Can be upgraded to Level 9.
• Army Camp: A total of 5 can be built in the first stage.
• Reinforcement Camp: A total of 3 can be built.
• Battle Machine Altar: The Battle Machine can be upgraded to Level 30.
• Battle Copter Altar: The Battle Copter can be upgraded to Level 30.
• Troop Levels (in the Star Laboratory):
• All previously unlocked troops: Can be upgraded to Level 18.
• Hog Glider: Can be upgraded to Level 18.

Strategic Implications

Builder Hall 9 is the ultimate test of Builder Base strategy.

• On Offense: The Hog Glider provides a powerful tool for surgical strikes, allowing you to temporarily disable a critical defense like a Roaster or Multi-Mortar while the rest of your army moves in. With two heroes at level 30 and all troops at level 18, attacks are incredibly powerful, requiring precise deployment and ability timing to secure the 6-star victories needed for high trophy counts.
• On Defense: The Lava Launcher fundamentally changes base design. Its massive range and area-denial capability make it the centerpiece of most BH9 layouts. You must design your base to protect the Lava Launcher while forcing enemy ground troops to walk through its fiery patches. The addition of a second Mega Tesla creates an incredibly dangerous core that can vaporize even the toughest armies. Defending at BH9 requires a deep understanding of troop pathing and how to layer your most powerful defenses to counter dual-hero attacks. Completing the O.T.T.O quest is the primary goal for most, as the reward of a sixth builder is one of the most valuable long-term assets in all of Clash of Clans.