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Clash of Clans has officially kicked off the Builder Base Bonanza event, giving players a perfect reason to revisit the Builder Base. The limited-time event dramatically boosts progression speed through major upgrade discounts and reduced timers, making it one of the most rewarding Builder Base events released so far.

Many players are already comparing it to the classic Hammer Jam event — but this time focused entirely on Builder Base progression.

Builder Base Bonanza Event Explained

The event runs from May 17 to May 31, 2026, and introduces a huge 50% reduction to:

• Upgrade costs
• Upgrade times
• Building upgrades
• Defenses
• Heroes
• Star Laboratory research
• Walls

On top of that, players also receive a 4x Builder Base Star Bonus, allowing resources to be farmed much faster than usual.

Supercell has additionally added rotating event challenges every five days, rewarding progression-focused items such as:

• Builder Star Jars
• Clock Tower Potions
• Rune of Builder Elixir

The event significantly accelerates overall Builder Base development, especially for players who previously delayed upgrades because of long timers or expensive resource requirements.

Best Opportunity Yet to Unlock the 6th Builder

One of the biggest highlights of Builder Base Bonanza is how much easier it makes unlocking B.O.B., the highly valuable 6th Builder.

Because hero upgrades, troop research, and building progression are all heavily discounted, the grind toward completing B.O.B.’s requirements has become far more manageable than normal.

For players already close to Builder Hall 9 — or those who have casually progressed Builder Base over time — this event may represent the easiest opportunity yet to fully complete the unlock requirements.

The event does not alter the official objectives themselves, but the reduced upgrade costs and shorter timers dramatically lower the overall time investment needed.

How to Make the Most of Builder Base Bonanza

Planning upgrades carefully becomes extremely important during the event due to how quickly builders become available.

Recommended priorities include:

• Focusing on B.O.B. requirements first
• Prioritizing hero upgrades
• Completing shorter upgrades early
• Saving longer upgrades for later during the event

Efficient resource management is also crucial, since upgrades finish much faster than usual. The boosted 4x Star Bonus helps maintain a steady flow of Builder Gold and Builder Elixir throughout the event period.

Quick farming strategies, especially fast two-star attacks, can significantly speed up resource collection.

Hero Upgrades Become Far More Valuable

The event also creates one of the best opportunities in recent memory to aggressively level up:

• Battle Machine
• Battle Copter

With both upgrade prices and timers reduced by half, even a handful of additional hero levels during Builder Base Bonanza could save players weeks of grinding in the future.

For many Clash of Clans players, this event may end up being one of the most impactful Builder Base progression boosts ever released.