On arrival officers found a number of cannabis plants in a purpose built room.
A 40-year-old local man was arrested a short time later on suspicion on growing a Class B drug. He is currently in police custody.
Police and fire officers are still working to establish the cause of the fire, initial indications are that it was an electrical fire. The fire caused damage to a section of the roof and smoke damage throughout the building.
Anyone who has information about the cannabis are asked to contact North Yorkshire Police on 101, select option 2 and ask for Harrogate CID.
Or call Crimestoppers anonymously on 0800 555 111 quoting reference number 12130086068.
Thanks to Johno Ellison for the images