Mark and Christina Rotondo want their son Michael to move out, get a job and take his broken-down Volkswagen with him.
The judge ruled in the parents' favor and ordered Michael Rotondo to leave after having a room for eight years.
"There are jobs available even for those with a poor work history like you. Get one - you have to work!" they said.
Mr and Mrs Rotondo filed their case with the Onondaga County Supreme Court, near Syracuse, New York, after months of unsuccessfully urging their son to leave.
Rotondo says he did not know why his parents have pushed for him to leave so quickly. Things became adversarial, he said, and their relationship has suffered.
