ACT Fire and Rescue southside commander Craig Perks said the fire at Seven Miles Coffee Roasters had been contained to a roasting oven using an extinguisher.

"You could see the smoke billowing out when we got here, but they've done a good job containing it and there was no structural damage or injuries," he said.

Three pumpers, an aerial appliance, breathing apparatus vehicle, HAZMAT unit and commander attended the scene just after 8am.

Police blocked part of Whyalla Street in both directions while firefighters remained at the scene.