Mid to later 19th century extensive group of farm buildings, these ranges consist of a cow-house, barn and cart-shed. The stables and cart-shed facing the road are listed separately (NPRN 404706 - W range). Not marked on the 1845 Tithe Map for Prysg and Carfan township. In 1791 Nant-y-Dderwen was part of the Johnes of Hafod estate.
Whitewashed rubble stone with slate roofs. Three ranges, all attached, but not all built at the same time. On the N side of the yard is a cow-shed with sloping roof-line, the lower pine end to the road and the upper against the pine-end of a much taller barn with level ridge. A lean-to at the east end protects a water-wheel of about 12' diameter, the iron parts cast by Ellis Bros, Eagle Foundry, Aberystwyth.
Source: Extract from Cadw listing description of 30.09.1997
