21 Severn Street

21 Severn Street is part of a terrace built in 1828, designed as a unified development for lawyer Richard Griffiths-Parry, who previously constructed the Mansion House as his residence.

The exterior features a brick front with rough local rubble at the rear and slate roofs that overhang on broad eaves, with end wall stacks for each property. The building stands three storeys high and has a symmetrical nine-window range that includes four properties. The end bays are slightly recessed and contain passage entries with six-panelled doors and overlights. The ground floor between these recessed bays is arcaded with a series of depressed arches connected by a projecting impost band, which also extends across the head of the central passage entry. On either side of this, the arched recesses feature paired doorways flanked by 12-pane sash windows. The six-panelled doors with overlights are set in moulded architraves, and the window recesses are rendered with painted sills.

The first-floor windows are 12-pane sashes with flat arched brick heads, while there are blind window spaces (rendered) above the main doors and central passage entrance, along with a canted oriel with a 12-pane sash to the right. All windows are linked by a continuous sill band, and the upper windows are 6-pane sashes positioned below the eaves.

This terrace represents an elegant example of early 19th-century urban planning and has maintained the uniformity of its original design almost entirely intact.