Surveyed by RCAHMW in 1974, with plans published in 'Glamorgan Farmhouses and Cottages' (1988), p. 465. Glyn Castle was among those sites recommended as 'most worthy of preservation' (p. xii). Glyn Castle is an excellent example of a small gentry house of 'renaissance' type of c. 1700 with a broadly symmetrical front dignified by a storeyed porch and moulded eaves' course. The principal architectural feature internally is the generous well-stair with twisted balusters in the purpose-built rear wing. Recent renovation work has exposed the masonry of a probable earlier core: a two-unit house with lateral chimney and mural stair. R. F. Suggett/RCAHMW/July 2008