The woman was shocked to hear news of the fire and said she heard the sirens go past her house about 6.45am today.
Two fire crews from Silverdale and East Coast Bays were called to the fire at 6.27am.
Fire and Emergency NZ communications shift manager Daniel Nicholson said the fire service was now providing support to police and St John.
"When we arrived it didn't take us long to extinguish the fire," Nicholson said.
St John treated and assessed one patient in a minor condition, a St John spokesperson said. No one required transport to hospital and the ambulance has left.