The Waihi Volunteer Fire Brigade rushed to the scene and doused the fire.
They used a thermal imaging camera to see if there was any more hot spots.
Fire chief Moe Stevens said they were satisfied they could not see any sign of heat and left the farm house.
But Mr and Mrs Whare decided they would be cautious and collected all precious items, photos, jewellery and family precious pieces and took them to a nearby neighbour.
"We could still see smoke coming out of the roof," said Mr Whare, "So Cindy went next door and I was going to sleep in the sleepout.
"The inside of the house was badly water damaged anyway; it would have been impossible to sleep in it."
The fire re-ignited in the ceiling areas and firefighters were called back at 3.30am to find the property well alight.
Firefighters spent several hours putting out the fire.