If a perm or any other hairdressing service has to be redone, it is still good etiquette to tip the hairdresser 15 to 20 percent of the usual charge for that service, according to PopSugar. If the redo is still not satisfactory, it is important to tell the salon manager.
The regular tipping rate for any hair service is also 15 to 20 percent of the service charge. Anyone who is very unhappy with a perm or other service at a hair salon can lower the tip to 10 percent. If the bad service resulted in actual damage to the hair, no tip is necessary.