Presbytery, St Mary's R.C. Church, New Abbey

St Mary's Roman Catholic Church in New Abbey was designed by architect Walter Newall and built around 1824. It features a T-plan presbytery and a rectangular church arranged in a cruciform layout. The building is constructed from white granite rubble with red ashlar dressings, while the west wing of the presbytery is harled. The presbytery is two stories high, with most windows featuring hood-moulds and a string course at the cill level on both floors. The windows are primarily sash, mostly small-paned, with bipartite windows in the north gable and a projecting ground floor bipartite in the west gable. There are low lean-tos in both re-entrant angles, with a porch on the north side beside a window in a tall pointed panel.

The church itself has two bays and pointed windows adorned with wooden Y-tracery, with hood-moulds on the north elevation. There is a blind Tudor-arched window on the east gable above the gabled porch, and a brick stack rises above the south wall. All main gables are topped with cross finials and shaped skews above heavy corbels at the wall-head. The roof is covered with graded slates.

Inside the chapel, there are two leaded windows; the north window is by Maver & Co from Munich, created after 1888, while the south window is in a similar style and was made after 1901. The sanctuary walls are decorated with cusped wooden panelling and feature a painted Madonna and child by artist J G MacLellan of Dumfries. Additionally, there is a sundial to the west on a plain octagonal granite column, with a bronze dial inscribed "John Copland, fecit, May 1827," designed specifically for the latitude of New Abbey.