St John's church is located on the south-east side of Church Street, dating from 1858 and built at a location that was then the edge of the Penydarren settlement. The nave, of 1858, was designed by a Mr Brigden of Dowlais and is constructed of patterned stone rubble, north entrance under a stone gable. Before 1919 chancel and transepts were added, constructed of coursed, rock-faced rubble and with paired lancets enlivened with red Ruabon brick dressings.
By 2009 the church had become disused, boarded up and sold. Its current use is not recorded.
Sources:
J.Newman, Buildings of Wales: Glamorgan (1995), p.438.
Ordnance Survey County Series 25-inch maps: Glamorgan XII.1, editions of 1900 & 1919.
Google Street View, July 2009.

David Leighton, RCAHMW, 3 June 2015