Flames from an Otahuhu house fire were so intense they spread to a neighbouring property.
The unoccupied Hutton St house was well ablaze when firefighters arrived, Northern fire communications shift manager Scott Osmond said.
It was one of two house fires in Auckland overnight, while Christchurch fire safety will be investigating a suspicious car fire which spread to a garage early this morning.
Although there was no one living in the Otahuhu house, the occupants of the property next door had to be evacuated as flames spread and the heat causing damage to their home, he said.
"It was well ablaze and obviously the heat caused some damage to a house next door relatively close to it. They were quite close."