Four fire trucks, ambulance vehicles and several police vehicles were still at the scene, he said.
Fire and Emergency NZ said about six crews were at the scene working to extinguish the blaze almost an hour later.
It appears to have started in a bedroom.
A spokesman said everyone who was in the house at the time managed to get to safety. However, two people are being treated by St John for smoke inhalation.
Firefighters were also called to a house fire in Christchurch late last night.
Emergency services got reports of the blaze at Dickson Cres, in Hornby, at 11.30pm.
A Northern Fire Communications spokesman said smoke alarms alerted those inside the house. This time, the blaze looked to have started in the kitchen.
A fire investigator is due at the scene this morning.