Mid to later 19th century range of outbuildings, part of an extensive Victorian farm group. This range consists of a lofted cart-shed with a stable at each end and a near-detached lofted stable at right angles. Buildings are not marked on the 1845 Prysg and Carfan Tithe Map. In 1791 Nant-y-Dderwen was part of the Johnes of Hafod estate.
Whitewashed rubble stone with slate roof. Two-storey, eight-window range facing the road and small two-storey one-window range at right angles at S end.
Source: Cadw listing description of 30.09.1997
