Disassembly and reassembly together typically run a few hundred dollars, depending on whether it's a one-piece or three-piece slate table and whether releveling is included. Three-piece tables generally cost more because reassembly requires precise seam alignment.
Two people can sometimes handle a one-piece non-slate table, but most slate tables need at least three or four people because the slate alone can weigh several hundred pounds. Attempting it with too few people is one of the most common causes of dropped slate and cracked frames.
No, felt does not always need replacing. If it's in good condition and removed carefully during disassembly, the same felt can often be reinstalled, though older or stained felt is a good opportunity to replace it.
It's often worth it because pool tables carry a higher risk of injury and expensive damage than most furniture, and specialty movers bring tools like slate clamps and levels that most households don't own. Many companies will handle a single specialty item without booking a full crew.
A standard slate pool table move usually takes two to four hours total between disassembly, transport, and reassembly, though stairs, long carries, or felt replacement can extend that timeline.