Nant Mill appears to be an early nineteenth-century building on a site where there was a mill by the sixteenth century. The buildings, of dressed stone under a pitched slate roof, form a long line with a wheelpit approximately in the centre. On the west side of the wheelpit is the earliest part of the complex, the two-storeys and attic former corn mill, with the miller's house at its west end. East of the wheelpit was a three-storey brewery, with a late nineteenth-century, two-storey domestic building further east again; the eaves level of the last is continuous with the brewery building, but the domestic builg is narrower back-to-front, and the roof ridge is therefore lower. The whole range is built into the bank of the large millpond, which lies immediately to the north of Gronant Road.

The overshot waterwheel has been removed, but the corn mill still contains three pairs of stones, unusual in being overdriven from a large spur wheel. A further pair of stones remains in the brewery section.

Information from Cadw Listed Buildings database.
W J Crompton, RCAHMW, 16 April 2014.