A 15-year-old boy has been charged with a raft of offences after he allegedly stole four cars and robbed a Perth home in which a 79-year-old man was found unconscious.

A 15-year-old boy has been charged over the alleged crime spree. Credit:The-age

The boy is due to face the Perth Children's Court on Saturday charged with eight counts of stealing, four counts of stealing motor vehicles, three counts of aggravated home burglary, one count of burglary and one count of trespass.

The elderly man remains in hospital.

- AAP