Three streets in Armadale were abuzz with lights and sirens late last week as three separate houses went up in flames.
The first incident occurred at the corner of Dower Court and Ringwood Road where crews were called to a fire at a single-storey home.
The fire, which started in the kitchen was deemed accidental and caused about $80,000 damage.
Crews from Armadale, Maddington and Murdoch attended the blaze and the resident was home at the time of the incident.
About an hour and a half later emergency crews were called to a property on the corner of Abbey and Forrest roads.
A total of seven crews from Armadale, Maddington and Murdoch attended the blaze, which has since been deemed as suspicious. The fire caused about $100,000 damage.
On Saturday a third blaze was reported to authorities with reports flames were coming from the roof of a property on Fifth Road.
A total of 11 crews from Armadale, Roleystone, Murdoch, Perth and Welshpool attended the fire, which was first reported about 2pm.
Police were called to close the surrounding roads and the blaze was deemed under control by 3.35pm.
The damage to the Fifth Road property was estimated about $200,000 with the cause of the fire suspicious.
Anyone with information was asked to call Crime Stoppers on 1800 333 000 or make a report online at crimestopperswa.com.au.
Rewards of up to $50,000 were available for information that leads to the identification and conviction of an arsonist.
