Not shown on the 1839 Tithe Map, the cottage is likely to have been built c1860 as a quarryman's cottage with its own small parcel of land forming a smallholding, coinciding with a period of expansion at the Penrhyn Slate Quarry. The size and standard of the accommodation in the cottage itself is very similar to that provided by the Estate for its workers in the terraced cottages at Mynydd Llandygai. In addition to Pen-y-llyn there are several other smallholdings of similar type, although now much altered, on the road between Mynydd Llandygai and Bryn Eglwys.

Source: Cadw Listed Buildings. ALH 06/08/2012