Police are appealing for information following three suspicious fires in the Te Kaha and Waihau Bay area.
Detective Sergeant Darren Thomas of Eastern Bay of Plenty Police said the fires burnt the residential properties to the ground.
"Thankfully no-one was injured but a significant amount of valuable property was destroyed. Police are investigating the fires and at this stage, two men have been arrested."
A 71-year-old man and his 30-year-old son have been charged with arson in relation to a fire in Hakota near Te Kaha on April 23.
Police are following other lines of enquiry in relation to two other fires on State Highway 35.