"They're all good. They were down the bottom end of the shed.
"We contained the fire and with the owner, we ventilated the building and started all the fans up, and put all the smoke out."
Waikato fire safety were at the scene investigating the cause.
Mr Clark said while they were not sure of what caused the fire, it was possible it was an electrical fault.
It was common for fires to break out in chicken sheds, Mr Clark said.
"I think it is because of the saw dust, and they are heated up to such a level to make the birds grow. Chickens [also] give off natural ammonia, so there is actually a gas in the building.
"When you do get a fire it is basically like a big oven."