Police believe they have dismantled a car re-birthing operation in Perth's southern suburbs.

Detectives raided a Wattelup property yesterday morning and say they found up to a dozen stolen vehicles.

Investigators believe the stolen vehicles have been stripped of parts and re-assembled into other vehicles.

Detective Senior Sergeant Ron Adams says the vehicles have been stolen from suburbs across the metropolitan area.

"It is part of an ongoing investigation," he said.

"However it will be alleged that is part of a motor vehicle rebirthing operation.

"The estimated value of the property that we've located is quarter of a million dollars.

"We'll allege that the vehicles have been stolen between July 2011 and May 2012."