How much does it cost to deal with my tree is hollow inside?

The diagnostic is the spend that saves money here. An hour of sounding and resistance drilling routinely converts a removal quote into a pruning ticket, and on this list it is the highest-return dollar available. If removal is warranted, the hollow itself is the cost driver: a compromised stem may be unsafe to climb and unusable as a rigging anchor, forcing a bucket or crane, and the decayed section has to come down in more and smaller pieces. There is no firewood value to offset the bill, and stump grinding often runs wider than estimated because the decay carries into the flare.