73 and 75, Castle Street

73 and 75 Castle Street are two houses that have been combined into one. They date from around 1530, with an early 19th-century refronting and rear additions, and partial exposure of timber framing from the early 20th century. The buildings feature both exposed and plastered timber framing, with peg-tiled and slated roofs, and 19th-century pink brick chimney stacks. The layout is an uneven U shape, with a deep 19th-century west wing and a short lean-to at the east end. The houses are two storeys tall and have cellars.

The front south elevation has a long range of three windows, which is plastered, but the east end displays exposed framing of jettied construction. The lower wall has been moved forward to create a flush appearance, with bull-nosed joists under the wall plate and clear mortices for empty jetty brackets, as well as earlier scars from ground floor windows in the studs. On the ground floor, there is a three-light casement window with glazing bars and three-by-three panes, along with cellar vents below. There is an early 20th-century boarded and studded door, a 19th-century sash window with horns and three-by-two panes, a 19th-century three-canted, flat-roofed bay window, and an adjacent doorway. The remains of a moulded door architrave and window cornice are visible, with a simple 20th-century repair; the window now has five plain panes, and the door has upper glazing with two-by-three panes, along with a cellar grille below the window. The first floor features three three-light windows with glazing bars and three-by-two panes, two of which were originally sliding. An off-centre stack to the east is located behind the roof apex and has 19th-century octagonal chimney pots.

The rear north elevation is mostly concealed by the west wing and partially by the east wing. The west wing is two storeys tall with two apex stacks, a slate roof, and a two-window range with sliding sashes and glazing bars, featuring six-by-four panes. There are central and south end doorways with flush four-panel doors. The east wing is also two storeys and has a lean-to with a slate roof, irregular casement windows, with one three-light window on the ground floor and two single and one double casement windows on the first floor. An inner stack runs through the lean-to roof. The east end elevation is plastered with protruding wall plates, while the rear brick lean-to has a roof that sweeps from the principal roof pitch, with the inner stack located centrally in the lean-to.

Inside, the jettied unit is very complete, featuring heavy close studding and ceiling joists, with a rear stair trap in the ground floor room. The Royal Commission on Historical Monuments records that there was a shop, which is appropriate given the bay window and integral door of No. 73.