The son of the WA Police commissioner has pleaded guilty in a Perth court to attempting to manufacture drugs.

Russell O'Callaghan, the 29-year-old son of Commissioner Karl O'Callaghan, was charged after an explosion at a house in the Perth suburb of Carlisle in March.

He did not appear at his first court date because he was in hospital being treated for burns.

Today, during a brief court appearance, he admitted to a charge of attempting to manufacture methylamphetamine.

The court was told the amount being manufactured was up to 1.2 grams of the drug.

He has been released on bail until he is sentenced in June.

A written pre-sentence report will be prepared for the Magistrate.