Described as an 'upside-down long-house', with cattle accommodation on the ground floor and living accommodation upstairs, the house was built in 1850. Of stone rubble construction with a central cross gabled wing, the structure is more or less intact as originally built, although there are replacement windows and the roof is tiled. The farm is annotated "Allt-cyn-Adda" on the first edition large-scale Ordnance Survey map of 1880, and "Allt-Cunedda" from the 1906 second edition onward.
(Information from Gerallt Nash, St Fagans: National History Museum)
B.A.Malaws, RCAHMW, 15 June 2007.