St Mary's comprises an undivided nave and chancel, with modern west porch and vestry on north. The fabric was much restored in 1906, being largely renewed above cill level. The fenestration and roof covering is modern. The doorways from the nave to the porch and vestry are round-headed and could be original, and there are at least some 16th century roof trusses.

Paintings include late seventeenth century memorial panels, a painted panel with the Lord's Prayer and Apostles Creed dated to 1691, and the Ten Commandments pained on a panel in the same style as the latter.

Inv.III,25b.
Refs: Inv.III,25b. 1691.
Notes by Dylan Roberts, c.2000

St Mary's well (NPRN 32205) can be associated with the church.

Sources include:
RCAHMW 1964 Inventory of Caernarvonshire III (West), 25 No. 1530.
Richard Suggett, Painted Temples: Wallpaintings and Rood-screens in Welsh Churches, 1200–1800, (RCAHMW 2021)

RCAHMW 2021