20 Union Street (including 12 Bryn Street)

20 Union Street, which includes 12 Bryn Street and outbuildings at the rear, is a Grade II listed building located in Penygloddfa, Newtown. This corner unit features zig-zag internal partitions that create a symmetrical three-window facade facing Union Street, with one tier of windows from No 12 Bryn Street also visible.

The building is three storeys high with a cellar, presenting a three-window front to Union Street and a two-window front to Bryn Street, with dummies on the left side. It is constructed of Flemish bond brick with a gently pitched slate roof that has a hip at the corner and lead ridges. The eaves cornice is saw-toothed, and the rear displays exposed purlins and rafters, along with brick stacks.

The second-floor windows on the front have shallow upper sashes with 12 panes, while the centre window on Union Street has 9 panes, and there is a dummy window to the left on Bryn Street. Flanking the doorway on Union Street are 16-pane sash windows. The original panelled shutters on pintles are found at Bryn Street, and there is a blocked window to the left. The windows feature gauged brick voussoirs, plain reveals, and stone sills.

Access to the doorcase on Union Street is via steps, which include a bracketed, moulded dripboard and panelled reveals. The door features a rectangular fanlight above a six-panel door. A similar doorcase is present at Bryn Street, but without a fanlight.

At the rear, there are iron lights to wooden cross windows. The backyard contains later 19th-century outbuildings made of English garden wall bond brick, with gabled slate roofs and ornamental bargeboards. Openings feature cambered brick arches, and the outbuilding's gable end faces the street. A rectangular fanlight is above a plank door, with a round-arched window to the right and a louvred vent above it. There are also two plank doors leading to a tile-capped yard wall.