The farmhouse is a building that is already on a farm when a game is started. It is mainly used to check information on achievements a player has completed, or is trying to complete.
The evolution of the farmhouse as the player complete more achievements:
From mid-December to mid-February Christmas lights are strung all over the house.
Players may check achievements by tapping on the farmhouse from level 6 and up. This will bring up a menu that shows the progress towards completing an achievement, the rewards that will be given upon completing an achievement, and a player’s “Farm Score”. The Farm Score is the total number of experience points accumulated.