Arson Squad Detectives will fly to Margaret River today to investigate a fire which destroyed a house.
Firefighters were called to the Tunbridge Street property just after 6pm, but were unable to save the house.
A DFES spokesman said the fire caused around $400,000 and was deliberately lit.
No one was home at the time the fire started.
Anyone with information is urged to call Crime Stoppers on 1800 333 000.