A family of five had no idea their wooden Canterbury house was well ablaze until a passing friend ran in to alert them.
The Rees - dad, mum and children aged 13, 10 and nine - were oblivious to the fire in the roof cavity of their home on Mackie St, Methven on Saturday night because their two working smoke alarms failed to go off.
Methven Volunteer Fire Brigade chief fire officer Selwyn Allred said by the time firefighters arrived, shortly after 10pm, the heat build-up was intense.
"When we opened the doors to the house it really went up," he said.
The family had been in the house only six weeks.