The fire which tore through a Judea business early this morning is believed to have been accidental.

A total of six fire trucks were called to the blaze at All About Auto Electrics on Koromiko Street at 4.40am.

Flames could be seen leaping from the two storey building as people drove past on Takitimu Drive at about 5am.

It didn't take firefighters long to extinguish the fire and were dampening down hot spots at about 6am.

The last truck on site was preparing to leave about 11am.

Fire safety investigator John Rewi was called to All About Auto Electrics on Koromiko Street to investigate the cause of the blaze.

John Rewi says the fire probably was an accidental cause – and it probably started in the stairwell leading to the accommodation over the office entrance.

The accommodation was occupied when the fire broke. No injuries were reported.

John Rewi's investigation is continuing.