Abstract: A seat fitting for seating furniture is provided, including a base frame, a sliding frame movably arranged relative to the base frame, and at least one linear drive which acts on a paired drive shaft in order to move a component or an assembly of the seat fitting, e.g., a foot part, a backrest part, or a stand-up aid, back and forth between an extended position and a retracted position relative to the base frame and/or the sliding frame. This allows a variable design and a retroactively simple adaptation on demand because the base frame, the sliding frame, the drive shaft, and the linear drive form a functional base unit which can be assembled in a modular manner to form a complete seat fitting with a foot part, a backrest part, a stand-up aid, and/or a seat frame provided for the sliding frame.