If the property has been clearly divided at the time of divorce and the transfer formalities have been handled, then the property belongs to one party's personal property. In this case, the sale of a house only needs the signature of the property owner, not the signature of the other party.
However, if the division of property is not clear at the time of divorce, or it has been divided but has not been transferred, then the property still belongs to the husband and wife. In this case, the sale of a house requires the signature of both husband and wife, because neither party has the right to dispose of the husband and wife's property alone.
In addition, if the seller disposes of the property jointly owned by the husband and wife without authorization, then the other party has the right to take back the housing rights and may require the other party to bear the liability for breach of contract and compensate for the losses.
Therefore, whether the sale of a house after divorce requires the signature of the other party depends on the specific situation. It is recommended to consult a professional lawyer before selling the house to ensure that your rights and interests are protected.