Mrs Gardiner sent her husband outside while she called the police, who in turn alerted St John and the local fire brigade.
"It was a bit of a mess out there. The driver seemed a bit dazed.
"He didn't know what had happened," she said.
Hotel guests rushed downstairs while Mrs Gardiner made sure people kept off the verandah.
"It was a bit of a shock, but now it's an inconvenience more than anything. And it affects the look of a historic building," she added. Cracks had also appeared in upstairs ceilings.
Sergeant Nathan Davis (Kawakawa) said the driver and sole occupant of the vehicle, believed to be a man in his 50s who had been checked by St John medics but had not been hurt, had been processed for drink driving. Police were now awaiting the results of tests before deciding on charges. The manner of his driving was also being investigated.
Meanwhile, a Kawakawa resident who was woken by the crash said he saw the driver walking, nonchalantly if unsteadily, away from the wreckage.
It was obvious he was the driver because no one else was on the street at the time.
Kawakawa Chief Fire Officer Wayne Martin said the brigade found a local builder to erect temporary supports and kept people away until the building was stabilised. The concrete planter box probably stopped the car taking down all the pillars, and possibly the verandah itself, he added.