Two storey, double-fronted, semi-detached house with single storey extensions to rear and east gable. Originally constructed before 1868 (present on Ordnance Survey 1:2500 1st edition map of that date).


The house was originally a single-storey structure with a thatched roof, until an additional, slate-roofed storey was added in the 1930s.


Old photographs suggest that Cummel Beg is older than its neighbour Creg y Shee: prior to the addition of the extra storey and rendering, a straight joint and trapped quoinstones on the west gable of Cummel Beg were apparent. It would also appear that only the left hand, or westerly, of the rooms in the original cottage had a hearth.


The property was acquired by the Manx Museum and National Trust in 1973.