Mr Stubbs said the aerial unit was due to leave shortly and only one fire crew would remain on scene.
The building was all but destroyed, he said.
"There's quite a bit of devastation here."
However, firefighters had been able to prevent the fire spreading to two adjacent buildings.
"So based on what they found on arrival - which was a well-involved, large property fire - to contain it to just the one building has been an excellent job," Mr Stubbs said.
"The prevailing wind was quite strong so it was certainly hampering our efforts, particularly when the wind was blowing towards one of the big risks we had next door, which was an LPG storage area."
Mr Stubbs said the wind made it difficult for firefighters, but had helped to dissipate the smoke.
"There was quite a lot of smoke drifting across Gore, and it was quite intense around the building itself," he said.
"We put out some precautionary advice to people across Gore to stay inside and to just keep out of smoke, because we didn't want it to cause any irritation."
People suffering smoke irritation should consult their GP or, if it was more serious, call an ambulance.
More than 90 firefighters from seven brigades across Otago and Southland battled the blaze at its height. A fire investigator would try to establish the cause of the blaze this morning.