11, Hertford Street W1

No. 11 Hertford Street is a terraced town house built around 1770-71 as part of the development on the south side of Hertford Street by the elder Henry Holland and his son, in partnership with John Eldridge. The interior is almost certainly the work of the plasterer Francis Engleheart, who was Holland's lessee. The house is constructed of brown brick with a rusticated stucco ground floor and features a slate roof. It has three storeys and an attic storey, which was likely added in the early 19th century, and includes a dormered mansard roof above a basement. The façade is three windows wide, with the entrance located to the left, featuring a panelled door and sidelights beneath a segmental fanlight. The windows are recessed sashes without glazing bars, set under flat gauged arches, and the ground floor windows and doorway have stucco rustication struck to the arches. A moulded stone cornice runs above the second floor and attic parapet, which has coping. A cast iron balcony was added across the first floor in the early to mid-19th century, along with cast iron area railings.

Inside, the house retains fine original decoration in the principal reception rooms, despite some alterations to the rear and to the hall, which features a mid to late 19th-century stone staircase with a cast iron balustrade. The ground floor hall has a good neo-classical plasterwork frieze and a similar fine plasterwork ceiling in the front room, both likely by Engleheart. The first-floor salon or drawing room remains virtually unaltered, showcasing an ornate plasterwork ceiling by Engleheart, decorated window frames and shutters, an enriched head to the doorway, and a fine stone chimney piece dating from around 1770. The top of the stairwell retains its original plasterwork frieze. Notably, the house was the residence of the 4th Earl of Sandwich, who was the 1st Lord of the Admiralty under Lord North, from 1782 until his death in 1792.