48, Upper Grosvenor Street W1

This is a terraced house built between 1727 and 1729 by Robert Phillips, with an early 19th-century attic storey added later. It is constructed of brown brick with red brick dressings and a slate roof. The house has three storeys, a basement, an attic storey, and dormers in a mansard roof, presenting a two-window frontage. A doorway on the right-hand side has a wooden doorcase with panelled reveals and framing pilasters, supporting an entablature featuring a grotesque mask. The recessed sash windows are set within segmental brick arches and vertically laced with red brick dressings. A stone cornice sits above the second floor, topped by a parapet with coping. First-floor cast iron balconettes are present, along with wrought iron area railings.

The interior retains the original layout, featuring a staircase between the front and back rooms. The staircase balustrade is a c.1845 alteration, made of cast iron and wood. Interior decoration is primarily in an 18th-century style, with later revisions. White Allom simplified the decoration and introduced a more fashionable classical style in the 19th century. Syrie Maugham further altered the interior, particularly the second-floor rear bedroom and a mirror-glazed bathroom featuring reeded glass quoin pilasters during the 1930s.