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A house fire in Perth's southern suburbs early this morning caused $400,000 damage.

Firefighters attended the blaze on King Road in Oldbury about 1.50am after a passerby alerted authorities.

The fire was quickly extinguished and no-one was inside at the time.

A police spokesman said the Department of Fire and Emergency Services were still trying to contact the property's owner.

A fire investigation officer will be at the house later today, but police believe the blaze was not suspicious.