(London). The official London residence of Her Majesty the Queen. Buckingham House (as it then was) was built in 1702–5 for John Sheffield, 1st duke of Buckingham, by the architect William Winde (d. 1722). It was bought in 1762 by George III, who had it enlarged by Sir William Chambers in 1762–9. In 1825 George IV approached his friend John Nash for designs, who incorporated Buckingham House in Buckingham palace. Some of the rooms were opened to the public in 1993 to help pay for the rebuilding of parts of Windsor castle after the fire in 1992.