People in nearby houses were evacuated after the alarm was raised at around 4.30, but there was no concern that the fire would spread as it was dealt with quickly.
No one was hurt during the incident.
Six firefighters wearing breathing apparatus tackled the fire and others worked from their aerial platform.
Station manager Robin King, who was supervising the operation, said they were quickly on the scene and had soon located the seat of the fire.
‘The damage was contained on the upper floor,’ he said.
Owner Sarah Maxey, who until recently had been living at the premises, was at the scene as firefighters removed slates from the roof to prevent them falling off.
Holidaymakers watched the operation from nearby al fresco dining areas and staff from Maxey’s appeared surprised to see the incident as they turned up for work.
Police officers kept part of the pier cordoned off during the operation and ambulance officers were in attendance but were not required.
Fire investigators who attended the scene were due to go back today to determine its cause.
Maxey’s chef Carl Perkins said that the restaurant appeared undamaged and he has already contacted electricians about work needing to be done to reinstate the supply.