20 Cathedral Road

20 Cathedral Road is a Grade II listed large detached villa built from thinly coursed pennant sandstone rubble, featuring Bath stone ashlar dressings, bands, and quoins. The roof is covered with Welsh slate and has bright red brick chimney heads. The design is inspired by the country house style of Norman Shaw from the 1875-80 period, with elements reminiscent of Burges's Cardiff Castle. This house is almost a mirror image of the adjacent No 22, although it has a distinctly different architectural finish.

The villa has three storeys and a three-bay front facing the street. The left bay is recessed and designed as a four-storey tower, featuring a three-light mullion-and-transom window on the ground floor and similar two-light windows above. The top floor is corbeled out, echoing the style of Cardiff Castle, and includes a three-light window set in a smoothly finished wall. The roof has a bell-cast shape rising to a ball finial, with a tall stack transitioning from stone to brick on the right side.

The second bay is set forward and mirrors the window arrangement of the tower's first three floors. The main bay on the right showcases a five-light semi-circular bay window on the first two floors, with ashlar panels between and on the balcony balustrade above. The second floor features a five-light window with a transom. Above, there is a plain coped gable with three tall red brick stacks on the roof behind. The left elevation is blind, while the right elevation includes the entrance to the rear on the ground floor and large four-light mullion-and-transom windows that illuminate the staircase above. The rear elevation was not visible, but it appears that the house has not been extended.

The interior details were not available at the time of the resurvey.