Church of St Mary, including churchyard walls and lych gate

The Church of St Mary dates primarily to the 14th century, with significant later additions and alterations. The church is constructed of sandstone rubble with ashlar detailing and has a slate roof. A prominent four-stage tower features diagonal buttresses, a 14th-century arched doorway and three-light window above it. The third stage of the tower includes two-light bell openings, an embattled parapet, and a stair tower in the northeast angle. Gabled aisles flank a clerestoried nave, with a 19th-century south porch added. At the east end, crocketted perpendicular buttresses and 18th-century masonry are visible. A blocked window in the north aisle’s east end has a Gibbs surround. Most of the windows are of 19th-century perpendicular style, although some original perpendicular tracery remains in the west aisle windows. The tower has been refaced. The south wall reveals at least two phases of medieval construction, including a blocked 13th-century doorway to the east of the 19th-century porch.

A lychgate sits at the southeast corner of the churchyard, which is bordered to the south by a rubble wall.

Inside, a 19th-century nave arcade is characterized by alternating octagonal and circular piers, supporting a 19th-century timber roof. The clerestory windows have alternating square and arched heads. The chancel is shallow, with two 16th-century cusped niches in the east wall. There are 18th-century chapels on either side of the chancel. A 15th-century wall painting on the south wall, depicting the Works of Mercy with texts in Welsh, was restored in 1870.

Furnishings include a free-standing font at the west end, and a small marble bowl on a wooden tripod designed by Robert Adam, gifted by the Williams-Wynn family in 1772. A mid-18th-century pulpit, located on the north side of the chancel arch, has a hexagonal stem and lively carvings, although it has been altered. The altar rails date from 1845, and the stained glass is primarily by Ward & Hughes, with some work by Gibbs in the west aisle.

Notable monuments include works by Nollekens, Rysbrack, and those attributed to Robert Adam, considered to be of the highest national standard for their period. A 15th-century tomb chest is also of a high standard. The north chapel houses the tomb of John Ap Ellis Eyton and his wife Elizabeth (d. 1526), featuring an alabaster tomb chest with two recumbent effigies and angel weepers. Henry Wynn (d. 1719) is commemorated by a wall monument featuring three life-size figures, pilasters, and drapery, designed by Robert Wynne of Ruthin. Lady Henrietta Williams-Wynn (d. 1773) is represented by a free-standing, life-size figure of Hope, holding an anchor, by Nollekens. Sir Watkin Williams-Wynn (d. 1751-4) has a reclining effigy, sarcophagus, and pyramid with an angel holding a medallion by Rysbrack. William Watkin Williams-Wynn (d. 1763) is depicted in an oval wall medallion with a sarcophagus attributed to Robert Adam. Other monuments are chiefly from the 18th and 19th centuries.