Plas Llysfaen is a large church hall complex designed by S Colwyn Foulkes, architect of Colwyn Bay. It is of roughcast brick construction on a rubble plinth; with slate roofs. The plan essentially consists of a main twin-gabled, double-pile section with irregular L-shaped flanking pavilions. The facade is near-symmetrical with a reflected pair of central gables, their outer pitches shallower and longer than their inner. These each have a pair of tall, recessed 12-pane windows, with shallow triangular heads and splayed slate cills. Dividing the gables centrally is a downpipe with cast iron hopper; this bears the raised lettering 'St. C' (for St. Cynfran's) and the date 1930. Adjoining to the left-hand gable, and stepped down from it, is a hipped-roofed extension, returned at a lower level to the front where it terminates in an apsidal projection. This has a hipped apsidal roof and four vertical, rectangular windows to the front, each an 8-pane casement. Extruded in the angle between the main block and this projecting one, there is a gabled entrance porch having a wide chamfered and stopped entrance arch with segmental head and 'in-and-out' type boarded double doors. Above the entrance there is an inset mosaic cross. To the right of the main block, there is a similar low L-shaped arm, terminating in an advanced gable to the front, with long, feathered inner roof pitch. This forms a catslide roof over a porch in the inner return.

Reference: Cadw listed buildings database.