A Wood Plane can only be built outside using the menu option Projects → Carpentry → Wood Plane.
A Wood plane can be used to plane 1 Wood into 1 Board. Wood Planes use Slate Blades to plane the wood. These blades occasionally break and the Wood Plane must be repaired before further planing can be performed. Repairing a Wood Plane requires 1 new Slate Blade.
Higher Focus lessens the chance that the Slate Blade goes dull.
The area near an active Wood Plane can cause "Poor Soil" pollution