The owners were extremely upset, Mr Robinson said. "They didn't have any insurance so it's a double blow for them."
There had been no power connected to the shed where the fire started, so it seemed most likely a case of arson, he said.
"We've got Fire Safety and police investigating."
Three fire trucks took over an hour to bring the fire under control.
The volunteer brigade were also called to assist with a house fire in Masterton and downed power lines caused by a falling tree in Longbush yesterday.
More than 140 properties were affected by the power outage, which was scheduled to be repaired yesterday evening.
A falling tree also downed power lines in Waite St, Featherston, just before midnight on Saturday.