Vestry to Trinity Chapel

The vestry to Trinity Chapel is a single-storey building made of rubble stone, topped with a slate roof that has close eaves. It features a yellow brick stack on the party wall shared with Cartref. On the eastern side, there is a large 12-pane sash window on the left and a boarded door with an overlight on the right, both with concrete lintels. There is also a basement window with a timber lintel to the left and a blocked door in the northern end gable facing the road.

At the rear, adjacent to Cartref, the building is two storeys high. The ground floor has three doors with stone voussoirs, while the upper floor has two 20th-century plastic windows that have replaced the original 12-pane sashes, also with concrete lintels.