The church was originally said to have been established by Saint Cadfan (who had to flee under pressure from Franks with his companions) somewhere between 510 and 515, shortly before he departed and founded a monastery on Bardsey Island where he served as its abbot from 516 to 542.

Stone masonry with square blocks of greyish shale siltstone is irregularly coursed in the porch, the vestry and the bell turret and fully plastered.

The roof (gabled to the east and west) is made of slates with black ceramic red ridge tiles with a cross finial to chancel.

The north and south walls are fitted with wooden benches fixed over stone plinths.

The southern wall has stone steps which lead to Tyn-llan (a public house in the past).

There is an earthen bank of 1 m height, which delimits the earlier boundary of the church where there is a lychgate made of stone.

[8] One of the buildings of Llangadfan, Abernodwydd, a timber-framed house originally built in 1678, has been removed and re-erected at the St Fagans National History Museum, near Cardiff.