17 Crescent Street

17 and 18 Crescent Street in Penygloddfa, Newtown, are three-storey buildings with a cellar, designed as a mirrored pair of former back-to-back houses. They feature a tunnel passage bay on the right. The front is constructed in Flemish bond brick, topped with a gently pitched slate roof, which is old with a lead ridge on No 17 and new on No 18. The eaves are deep and boarded. There is a central chimney stack, with an auxiliary stack serving the tunnel passage bay at No 19.

The second-floor windows have shallow eight-pane sashes, while the first and ground floors have sixteen-pane sashes. All windows have stone lintels and sills, with plain reveals. There are cellar openings below, similar to the bay over the tunnel passage. The doorways are offset at the outer ends and feature plain doorcases with corniced brackets supporting gabled dripboards, along with original six-panel doors. The tunnel passage entry to the former Jones's Court at the right end has a stone lintel.

The rear elevation is slate hung, with original small-paned iron windows at No 17 and modern windows at No 18. The eaves continue to be deep and boarded.