Capel y Groes is situated within a rectilinear churchyard, bounded to the west by a road, and to the north by a dwelling, Gwer-y-Berllan, depicted as Capel-bach-isaf on first edition (1889) Ordnance Survey mapping.

The current building is a chapel of ease, which stands on the site of an earlier chapel. An incised cross was found here and moved to Carmarthen Museum in 1985.

N Vousden, RCAHMW, 1 October 2012