Each Builder's Hut comes with one builder. Builders are very important in the game to upgrade, build and rebuild structures.

The price of a builder increases with additional purchase. Here is a breakdown of the costs:

• First builder: Free when you start the game
  
• Second builder: 250 gems (acquired during the tutorial)
  
• Third builder: 500 gems
  
• Fourth builder: 1000 gems
  
• Fifth builder: 2000 gems
  

Having bought more builders in the game is a cumulative advantage, and this is why the prices of the builders increases.