5 fire engines sent to the village of Dolton.
Emergency services were called just after 1300 by the owner of the property to say it was on fire and the roof had already fallen in.
8 fire engines and numerous special appliances were sent to the property, which was under going renovation.
After the arrival of the first 5 fire engines (Hatherleigh, Torrington, North Tawton, OKehampton and Holsworthy), everything else except the water bowser from Barnstaple were sent back to stations.
Officers say it was a 2 storey building measuring 12m by 12m and the roof was completely destroyed.
Crews from Hatherleigh will return this evening to check on the hotspots.
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