The extent of the damage to a Mandurah bar after a fire tore through the heritage-listed building has been revealed.
The fire broke out at Bar Therapy on Mandurah Terrace around 5.20am on Tuesday.
It took firefighters about an hour to extinguish the blaze.
Video of the damage has since emerged showing the bar area completely destroyed along with part of the roof.
A WA Police spokesperson said the they are continuing to investigate the cause.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000.