Mr Kitchen said it appeared building paper laid as part of the renovation had caught fire, and had been burning in the ceiling for a while before crews arrived.
Kaitaia senior station officer Ross Beddows said the first appliance was on the scene, some 15 kilometres north of Kaitaia, in "10 minutes flat", but even so had arrived only in the nick of time.
A second appliance and the water tanker were close behind the first crew, Mr Beddows said adding that the old villa had been minutes away from being totally involved by the time the first hoses were in action.
The house suffered smoke and water damage, but was insured. Mr Kitchen praised the efforts of the volunteer crews in bringing the fire under control, minimising the potential damage to the property.
He urged people undertaking such renovations to take extra care, and have a hose or other water source on hand as a precaution.