No.12 Bryn Street (including No.20 Union Street)

No. 12 Bryn Street, which includes No. 20 Union Street, is a corner building that features zig-zag internal partitions, allowing for a three-window symmetrical facade facing Union Street. The structure is three stories tall with a cellar, presenting three windows to Union Street and two to Bryn Street, with dummies on the left side. It is constructed of Flemish bond brick and has a gently pitched slate roof that is hipped at the corner, with lead ridges and a saw tooth eaves cornice. The rear displays exposed purlins and rafters, and there are brick chimney stacks.

The second-floor windows on the front have shallow upper sashes with 12 panes, while the center window on Union Street has 9 panes and a dummy window to the left on Bryn Street. The first-floor windows feature 16-pane sashes, and there is a 12-pane window above the doorway on Union Street. The original panelled shutters on pintels are present on Bryn Street, along with a blocked window to the left. The facade includes gauged brick voussoirs, plain reveals, and a stone sill. Steps lead up to the doorcase on Union Street, which has a bracketed, moulded dripboard and panelled reveals, topped with a rectangular fanlight and a six-panel door. A similar doorcase is found on Bryn Street, though it lacks a fanlight.

The rear of the building features iron lights to wooden cross windows. There is a back yard that includes later 19th-century outbuildings made of English garden wall bond brick, with gabled slate roofs and ornamental bargeboards. The openings have cambered brick arches, and the outbuilding's gable end faces the street. It has a rectangular fanlight above a plank door, a round-arched window to the right, and a louvered vent above. There are also two plank doors leading to a tile-capped rear wall.