Firefighters attended a blaze at a single-storey building, used as an office near Thame, on December 10.
Crews had to cut away part of a pitched roof on fire at Village Farm, off the Thame to Chinnor road.
Firefighters from Thame and Wheatley were called out at 5.20am.
The cause of the fire, which affected about a third of the 20m by 6m roof, was believed to be an electrical fault.
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