Spiritfarer Wiki

The Windmill is a building for Stella's boat used to grind grains into flour for cooking.


Stella is not instructed to build a Windmill by any Passenger, so it can be built at any time.

As a Production Building, constructing additional Windmills will increase the cost by the base cost up to the fourth copy, after which all buildings will cost the same.


Oak Plank


Aluminium Ingot

First (Base Cost) 16 8 5
Second 32 16 10
Third 48 24 15
Fourth & up 64 32 20


Stella can interact with the bin on the third floor of the building to input up to five of the same grain which are processed one at a time. Stella can add or remove these items at any time during milling. The Windmill will run automatically, as long as the wind indicator on the top floor is within the milling window for that grain.

Wind speed changes with location, time of day, and weather, and correlates with how fast the grains are processed. The Windmill with turn faster in storms and while the boat is travelling long distances, and will turn slower when the boat is stopped. Stella can interact with the window to move it up or down at any time to accommodate these changes.

When the milling of one item is complete, Stella will receive a notification with the icon of a wheat stalk. This notification will follow Stella around the boat. When all items are complete, the Windmill will stop turning. Stella can retrieve the finished items as they are processed by interacting with the bin on the bottom floor.

Each input will produce one output, unless the Windmill has been improved.

Input Output
Corn Corn Flour
Rice Rice Flour
Wheat Wheat Flour


"Really teach that grain who's boss."


The windmill improvement is awarded to Stella after completing "Hummingberg Preservation Society", which is given at Alt Harbor after obtaining the windmill blueprint.


Doubles windmill output.