Church of St. Andrew

The Church of St. Andrew is a largely 17th-century building, although incorporating fabric from earlier dates, constructed of roughly squared red sandstone rubble with Welsh slate roofs and red ridge tiles. It comprises a nave, a south porch, a lower, weeping chancel with a north vestry, and a west tower.

The nave features a three-light Perpendicular window with a square traceried head. A large gabled porch with a relatively narrow three-centred archway, coped gable with a cross and lancet windows in the returns, adjoins the south side. The nave’s north wall has a projection, originally for a rood loft, mostly converted into a window in 1910. There's also some disturbance in the walling indicative of a previous north aisle. The chancel has a priest's door with a three-centred head, a possible Early English lancet in the south wall, and another on the north. An east window is a three-light Perpendicular design with cusped lights and a plain gable. A small, lean-to vestry covers much of the north wall.

The west tower is small and squat, possessing a strong batter, and extends almost the full width of the nave. It rises in three stages with a two-pointed arch west door, lancets above to the ringing chamber, paired louvred openings to the belfry, a corbelled parapet, and a low pyramid roof with a weathervane.

Internally, the chancel arch is wide with a nearly semi-circular form, featuring three continuous chamfers. The tower arch is also wide, more pointed, and similarly detailed with three continuous hollow chamfers. The nave has a pointed waggon roof with ties and plaster panels between the ribs, and the chancel has a close-boarded waggon roof with raised ribs. Only a stair and corbels remain to indicate the former rood loft. A Roman memorial slab, dedicated to Julius Julianus of the 2nd Augustan Legion (attributed to AD 100), is set into the north wall of the nave. Furnishings include a 17th-century communion table and altar rails, and an octagonal font dated 1662. There is one 16th-century bell and five dated 1662. The pews are likely from 1910, designed in a 17th-century style.

The porch contains a Portland stone inscription by Eric Gill that reads 'TO THE GLORY OF GOD / This Parish Church of / St Andrew Tredunnoc / was restored in the year 1910 / Charles Thelwall Salusbury – Rector.' The porch roof retains its original arched braces and moulded purlins.