3 Union Street

3 Union Street is part of a three-storey industrial terrace located at 1-5 Union Street in Penygloddfa, Newtown. The terrace consists of two-storey, one-window houses with weaving lofts above. The buildings are constructed from English garden wall bond brick, with Nos 3, 4, and 5 being painted. The roof is gently pitched and covered with slate, with older slate on Nos 1 and 2. The eaves feature a saw-toothed cornice, and No 1 has a brace plate. There are lateral chimneys at the rear.

The weaving lofts above Nos 1 and 2 have three-light casements, while the other windows are modern. The first and ground floors of Nos 1, 2, and 5 have cross windows, with other windows also being modern. The windows are topped with cambered header arches and have shallow reveals without sills. There is a cut window flanking the door to No 5. The doorcases are plain with brackets supporting the dripboards, and the doors are modern. At the rear, there is a later continuous lean-to outshut.