Monnow Mill or Queen's Mill stands on the site of the town corn mill of 1448. The present four-storey (attic, two storey and basement) house, of rubble with ashlar dressings under a slate roof, dates from the early nineteenth century and still has a weir in the Monnow, with a very short leat. After 1895 two undershot wheels, measuring 3.6m (12 ft) and 0.9m (3 ft), drove four pairs of millstones and rollers. The building is now used as a dwelling.
Sources: SD Coates & DG Tucker, Water-mills of the Monnow & Trothy & their tributaries, 1978, p.19; CADW Listed Building description; A Guide to the Industrial Archaeology of South East Wales, AIA, 2003.
RCAHMW, 29 July 2011.