Clash of Clans Hammer Jam Guide: How to Get 80% Upgrade Discounts

To reach up to an 80% discount during the Hammer Jam event in Clash of Clans, you must stack the event's flat 50% Home Village cost reduction with an active Town Hall upgrade boost and the Gold Pass Builder Boost perk. Combining these reductions allows you to upgrade defenses, traps, and walls at a fraction of their standard cost.

How Hammer Jam Discounts Stack

Hammer Jam applies a baseline 50% reduction to all Home Village construction and wall upgrade costs. Reaching the maximum 80% discount requires layering two additional active modifiers on top of the event:

1. The Gold Pass Builder Boost: Unlocking perks along the Gold Pass track reduces building costs by up to 20%.
2. The Town Hall Boost: Completing a Town Hall upgrade triggers a temporary boost that further discounts upgrade costs and accelerates village features.

Because these reductions apply against building costs concurrently, high-cost signature defenses and wall pieces become significantly cheaper to initiate.

Best Practices for Upgrades and Builder Management

Taking full advantage of the discount window requires managing your builders and resource flow so construction never stalls.

Prioritize Walls Between Upgrades

Walls provide the highest immediate value during Hammer Jam because they complete instantly without requiring an upgrade timer. By contrast, defensive structures tie up builders for days. Keep one builder unassigned to act as a dedicated wall worker. Whenever your Gold or Elixir storages approach their capacity, dump the excess into wall segments before committing resources to a multi-day building project.

Stagger Builder Schedules

Locking all builders into long defensive upgrades on the first day stops you from spending newly farmed loot. Follow these scheduling rules:

• Maintain a 24- to 48-Hour Release Cadence: Space out your upgrade start times so that a builder becomes available every day or two.
• Alternate Project Durations: Mix long projects like Eagle Artillery or Scattershots with shorter upgrades like Traps and Bombs to keep builders cycling.
• Queue Heavy Upgrades Before the Event Ends: Start your longest, most expensive upgrades during the final hours of Hammer Jam. Any upgrade initiated before the event concludes retains its discounted price, even if the timer finishes days later.

Farming Resources Efficiently

To sustain rapid spending, run low-cost, fast-cycling armies. Standard war compositions cost too much Dark Elixir and take too long to train.

Sneaky Goblins are the most effective farming unit for this event. Pair them with Jump Spells, Earthquake Spells, and Invisibility Spells to target Town Halls, Clan Castles, and exterior resource collectors without using a full army. Activating a Training Potion during active play sessions accelerates army production, letting you fill storages quickly and spend the surplus directly on walls.

Upgrades Excluded from Hammer Jam

Hammer Jam applies strictly to Home Village construction costs. Avoid misallocating resources on categories that do not receive the discount:

• Hammers of Building: Using a Hammer of Building on a structure that is already discounted by 50% to 80% wastes the League Medal value. Save Hammers for full-price upgrades after the event ends.
• Laboratory Research: Troop, spell, and siege machine research timers and costs are not discounted by Hammer Jam.
• Hero Equipment: Upgrades that require ores do not receive event price reductions.
• Builder Base: The event discount does not apply to structures or walls in the Builder Base. Focus active farming and builder time exclusively on your Home Village.