1. Nave part of old church probably 14th century, chancel, North chapel and South porch modern.

2. Constructed of schist rubble with grit dressings. The chancel has a reset C15 window in its east wall of three lights in a 2-centred pointed head. The nave features two further C15 windows, and a doorway which probably dates from the C14. The roof of the nave has late medieval arch-braced trusses.
(Source: site file AN/ECC/SH38 and Anglesey Inventory, 1937 [1960 reprint], p.