St Mary's church is situated about 0.5km west of the village of Tregarth, on the north side of the B4409 at its junction with Lon y Wern, in a rectangular churchyard used, and extended, as a cemetery. It was built in 1869 to designs of Thomas Jones. Constructed of dark rubble with grey limestone dressings and slate roofs, it consists of nave and narrower chancel, gabled south-west porch, gabled south vestry and north transept organ chamber. Inside, scissor trusses support the chancel roof with less substantial arch-braced ones in the nave, on floriate corbels and with high collars. Stained glass in the north window is by Jones & Willis, in the south window by J.Wippell & Co.
Source:
R.Haslam, J.Orbach & Adam Voelcker, Buildings of Wales: Gwynedd (2009), p.525.

RCAHMW, 30 March 2016