The old Raupunga store burnt to the ground on Thursday morning.
Wairoa chief fire officer Grant Duley said they were called to property at seven minutes past midnight but by the time they arrived the house was completely gone.
"I arrived 10 minutes after the first crew and the house, which use to be the old dairy, no longer existed."
He said the fire appeared to have started in one of the bedrooms but everyone got out safely.
"The young fella who was in the house woke to smoke and got his grandmother out."