Approximately 16 fire trucks responded to the fire, Ms Ruru said.
"At the moment they're still using multiple hoses - high pressure delivery and low pressure delivery.''
Emergency services were still at the property.
There are no reported injuries but several people were being treated for smoke inhalation.
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West Coast Road is cordoned off at Shaw Road, and motorists who normally travel along the road are advised to find an alternative route for the next few hours.
A rubbish fire was also discovered in Glen Eden early this morning - at 3.47am on Waikumete Rd.