Capel-y-Dyffryn Welsh Calvinistic Methodist Chapel was first built in 1777. It was rebuilt in 1836, to the design of architect William Williams of Cilcain, in the Simple Round-Headed style with a long-wall entry plan. Although the exterior is now pebble-dashed, the chapel is substantially that of 1836. Capel-y Dyffryn is Grade 2 listed.

RCAHMW, October 2009