Report on a programme of historic building recording, conducted to inform proposed alterations and change of use of an outbuilding at Grimblethorpe Hall, Gayton le Wold. The surveyed building is a two-storey, former threshing barn, built of uncoursed limestone rubble. The structure forms one of the few surviving parts of what had been a complex of mid 19th century farm outbuildings, typical of the established 'High Farming' movement, but now largely demolished or replaced by more recent structures.