Former Monastery / Clergy House at the Catholic Church of St Mary

The former monastery and clergy house at the Catholic Church of St Mary is constructed from coursed dressed rubble stone with ashlar dressings and a plinth. It features a slate roof with overhanging eaves, decorative ridge tiles, and ridge stacks. The building has a wide, three-storey main block facing southeast with four bays. This block includes tripartite windows, 24-pane transom gabled dormers with flat heads, and 24-pane casement windows with relieving arches on the ground and first floors.

The entrance is located on the southwest side, featuring a two-bay design with a pointed door to the left, a 16-pane window above, and a square 12-pane window on the second floor. To the right, there are similar windows on the ground and first floors, along with a pointed trefoil in the gable.

At the rear left, there is a 2½ storey wing that connects to the church, featuring a cat-slide roof at the ground floor. This wing has a wide gabled 18-light dormer and a similar window below with leaded lights, along with a ground floor window to the left. The building is attached to a buttressed stone extension from the church.

The northwest elevation includes various openings, all with yellow brick dressings, and a rear wing with a ground floor window. The main block has two windows on the ground floor and four on the first floor, with the center windows being smaller. There is a single window on the second floor with a fire escape stair attached. The northeast elevation has two 16-pane windows on the second floor, along with a single-storey extension featuring a gable stack and window, a 24-pane window to the southeast, and an additional lean-to.

The building has an axial plan with a corridor running across the rear of the main block, repeated on each floor. There is a straight flight stair at the northeast end, which is a later addition. Rooms are located to the southeast of the corridor, with a chapel situated on the first floor of the rear wing.