Parish Church of The Holy Trinity

The Parish Church of the Holy Trinity is a late medieval church consisting of a nave, a stepped-down chancel, a south porch, and a west tower with a saddleback roof. The church was constructed from limestone rubble with slate roofs covering the chancel, nave, and tower. The east window has two lights with Perpendicular tracery, sandstone dressings, a simple hoodmould, and is set beneath a relieving arch. Staged buttresses are located at each corner of the chancel’s east elevation, and a stone cross sits atop a coped gable. The south elevation of the chancel features a central, narrow round-headed priest’s door. To the right of this door is a wall monument inscribed in Latin, commemorating Hancorne, rector of Llandow, who restored the chancel in 1712. The chancel's south side has a single, early lancet window at the east end and a two-light window with a square label. The nave's porch has a central gabled form with a 19th-century two-centred outer arch and a round-headed Norman inner doorway. Three 18th-century tombstones stand to the east side of the porch. To the right of the porch is a 19th-century, square-headed three-light window with ogee Perpendicular tracery, and a similar two-light window sits to the left. The west tower is tall and narrow with a saddleback roof and a strong batter. Each face of the tower has a louvred belfry window, except the west face, which has a square-headed opening with a timber lintel set at a high level. A single, square-headed stairlight is present on the south face. The north elevation of the chancel is lit by a single cusped ogee window with trefoils in the spandrels, set under a flat timber lintel. A buttress at the far east end of the north face is different from those on the south side. The south face of the chancel is unlit.

The churchyard holds a number of 18th and 19th century tombstones. The remains of two churchyard cross bases are located to the right of the south gateway.

Inside, the chancel arch is small and two-centred, resting on large Norman cushion capitals, with two small squints flanking the arch. A large outer arch projects slightly from the chancel wall above the smaller arch. The chancel and nave have a 19th-century scissor-truss roof. A decorative 19th-century reredos features three stone cusped and crocketted ogee arches supported on dark green marble pillars, and may incorporate earlier stonework. A Norman pillar piscina is located in the southeast corner of the chancel. A 19th-century Neo-classical memorial to the Jones family of Llandow is set into the south wall of the chancel, showing a classical white marble urn draped in black. The pulpit and pews date from the late 19th-century restoration. A Norman font is located immediately to the west of the south door and has a bold-roll moulding to the top. A two-centred arch leads into the tower.