The second Duke of Richmond employed Matthew Brettingham to enlarge the house to the south, with a pedimented front based on William Kent’s Devonshire House in Piccadilly. This was unfinished when the Duke died in 1750 so it was left to Sir William Chambers to complete the interiors. His son, the third Duke of Richmond, employed a young James Wyatt to remodel and extend the north wing (now mainly demolished) in 1771. This included the Tapestry Drawing Room which was decorated in 1776-7.
In 1791, the family’s main seat, Richmond House in Whitehall, London, burnt down. Much of the great art collection was saved and James Wyatt added two great wings to showcase it, taking advantage of the sweeping views across the park. To give unity to the two new wings and Brettingham’s south wing, Wyatt added copper-domed turrets framing each façade.