St Bride's Chapel, including choir and memorial stones in churchyard, excluding scheduled monument

This is a late 13th or 14th century Gothic church choir, rebuilt in 1878 by architect Sir Robert Rowand Anderson after it was dismantled in 1781. It is a single-storey, rectangular building constructed of coursed ashlar stone. The east gable features a tall window with a Y-shaped tracery design. There are similar Y-traceried windows on the south and north walls, with the north wall having been altered. A segmental-headed doorway has been inserted below the northwest window, and the western end of the choir is marked by a blocked arch. A distinctive beakhead moulding, resembling a bird's beak, decorates the eaves of the slated roof.

The interior of the choir contains three canopied tombs with carved stone effigies set into the walls. On the north wall, near the west corner, is an effigy believed to depict Good Sir James Douglas (died 1331), situated beneath a 15th-century pointed-arched canopy with cusped and crocketed ornamentation. In the east corner, a stone effigy represents Archibald, 5th Earl (died 1438), resting on a tomb chest with weepers (small mourning figures) along the front. On the south wall are effigies of James, 7th Earl (died 1443), and his wife, Beatrice de Sinclair, also on a tomb chest with ten weepers and under a cusped and crocketed canopy. Latin inscriptions on this tomb date it to between 1448 and 1451. An earlier female effigy, depicted in robes with her feet resting on foliage, is located at the west gable. There are two round-headed recesses in the east gable and a double piscina, a stone basin used in pre-Reformation churches to drain water, on the south wall. The choir has late 19th-century painted and leaded glass panels, encaustic tile flooring, and a ribbed timber barrel vault roof. Below the choir is the Douglas Vault, which was not inspected in 2014; it extends across two levels, the lower of which is inaccessible.

The listing includes the choir itself and memorial stones within the churchyard, but excludes Scheduled Monument SM90265, boundary walls, and gatepiers.