A stump left behind after removal can sprout new shoots, attract insects and get in the way of mowing or replanting. Grinding takes the stump down below ground level with a machine that chips it away, leaving a pile of wood chips and soil that can be spread or hauled off.
Prices usually depend on the stump's diameter, how many there are and whether the grinder can reach them easily. A narrow side yard or a stump behind a fence may need a smaller machine. Before grinding, the company should arrange a utility markout through Pennsylvania One Call, since gas, water and electric lines can run close to old trees. Ask how deep they grind, whether they remove surface roots as well, and whether cleanup of the chips is included. If you plan to plant in the same spot, mention it so they can grind deeper.