Arson Squad Detectives have charged a 42-year-old man in relation to a fire in Pinjarra this morning.
Emergency services were called to the fire on Uldina Place around 5.35am on Thursday.
All the occupants were safely evacuated, but the unit was entirely destroyed.
Police arrested a 42-year-old man at the scene.
He has since been charged with breach of duty of a person in control of an ignition source or fire.
He is due to appear in Mandurah Magistrates Court tomorrow.
Concerns for missing Bertram woman
Concept designs released of Safety Bay Foreshore development
McLaren driver clocked speeding at 259km/h on Forrest Highway
Man found dead inside Orelia home, one in custody
Nominations now open for Mandurah's 2027 Community Citizen of the Year Awards
Romanian national charged after police uncover ATM card skimming across Rockingham, Mandurah
Cooloongup man sentenced for poisoning dog before dumping body in rubbish bin
Bird flu vaccinations begin on little penguins at Penguin Island
Man fined $10k over shocking cruelty towards German Shepherd in Baldivis