Winfield House is situated in 12 acres of Regent's Park. Built in 1933 for Barbara Hutton, the Woolworth's heiress, the house was donated to the American Government in 1954 and is now the official residence of the American Ambassador to the Court of St. James. The practice has completed a major £20m refurbishment of the house, the grounds and all of the ancillary buildings, undertaking the survey work, leading the design team and acting as project managers for the construction contract.
The work, which was completed on time and on budget, involved external repair works, the replacement of all mechanical and electrical services, and the re-planning and restoration of the large reception rooms. This entailed the removal, storage and reinstatement of thousands of priceless furnishings and mementos, including three layers of eighteenth-century Chinese ricepaper wall coverings.