29a, Monmouth Street with screen wall

This is a small, mid-18th century backyard house with 20th-century alterations. It was likely built as an extension to the rear wing of a now-rebuilt building. The plan is unusual, featuring a rear closet on each floor behind a stairwell connecting the flanking rooms.

The exterior is limestone ashlar with a flat felt roof. It is three storeys high, with a platband above the ground floor. There are three bays, featuring tripartite glazing bar sash windows on the ground and first floors (except for the left-hand ground floor window), and single windows on the second floor, all altered in the 20th century. A coved cornice and remnants of a parapet are visible, returning to the sides. The central entrance has a slightly chamfered surround, with the lower four panels raised and fielded, and the upper two cut away and glazed.

Inside, the house reflects the vernacular style of local builders of the time. The second floor has stone fireplaces with flat surrounds and outer edge moulds, while the first floor features stone fireplaces with moulded architraves. The staircase has a continuous newel, straight flights, and landings between floors. The lower flight of the staircase has reduced balusters below the string, and the upper flights have ramped handrails to the landings. A complete dado rail is present in the first-floor north room. The rooms have six-panel doors, while cupboards have two-panel doors.

Attached to the front, to the left of the façade, and at a right angle, are the remains of a screen wall in ashlar. This wall is one storey high, featuring a plain central opening flanked by narrower side openings. It has paired incised pilasters with Greek key terminations to the head and foot, sits on a small plinth, and incorporates a plain frieze band and a heavy parapet.

This house is an unusual survivor in a "backland" area, notably rare in Bath, surrounded on all sides by built-up streets. It has a picturesque setting, with a paved courtyard reached by an archway from Princes Street (number 3A).