Croydon police are appealing for public assistance following a suspicious fire at a house in Croydon last week.
Emergency services responded to Newman Road after residents woke to their front door on fire about 7.02am on Wednesday 29 June.
Three adults and a child were home at the time and managed to get out of the house safely.
The front door was completely destroyed and partial damage sustained to the side of the house.
Police believe a small hatchback model vehicle with a black stripe on the side was seen leaving the scene at the time of the incident.
Investigators are keen to speak to any witnesses or anyone with dashcam footage that may have been in Newman Road or surrounding streets between 6.45am and 7.30am.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or online at www.crimestoppersvic.com.au