Ystradffin Farmhouse is an historic home, which was once the residence of Thomas Jones (Twm Sion Cati). Although it has its origins in the 17th century the current building dates the 18th-19th centuries. Built of rubble the farmhouse is 2 storeys high with a slate roof. The windows are sash with cambered heads and glazing bars.

RCAHMW, 11th February 2009.