Sledmere House is a Grade I listed Georgian country house, containing Chippendale, Sheraton and French furnishings and many fine pictures, set within a park designed by Capability Brown. It is located in the village of Sledmere, between Driffield and Malton, in the East Riding of Yorkshire, England. The present house was begun in 1751, extended in the 1790s, and rebuilt after a fire in 1911. It was once the home of Sir Mark Sykes, noted English traveller and diplomatic advisor, and is now the home of Sir Tatton Sykes, 8th Baronet.
The house is built in Nottinghamshire ashlar on three storeys to an H-shaped plan.
William Sykes (1500–1577), migrated from Cumberland to the West Riding of Yorkshire, where he and his son became wealthy cloth traders. Daniel Sykes (b.1632) was the first member of the family to begin trading in Hull and made a fortune from shipping and finance. Richard Sykes (1678–1726) concentrated on the flourishing Baltic trade in pig iron and the wealth of the family was built on this in the first half of the eighteenth century. His son Sir Richard Sykes (1706–1761) married Mary Kirkby, daughter of Mark Kirby, and heiress to the Sledmere estate.
In 1751 Sir Richard Sykes demolished the previous Manor House at Sledmere, which had existed since medieval times, and built a new mansion. He also planted some 20,000 trees on the Wolds about his new home. He left no male heir however and on his death the estate passed to his brother Mark Sykes (1711–1783). Sir Mark's son, Sir Christopher Sykes, 2nd Baronet (1749–1801), MP for Beverley, greatly expanded the estate. He and his wife bought and enclosed huge areas of land for cultivation, built two new wings to the house, and landscaped the grounds, planting 2,500 acres (10 km2) of trees. The entire village of Sledmere was moved. Sir Christopher left a vast estate of nearly 30,000 acres (120 km2) and a large mansion set in its own 200 acres (0.8 km2) of parkland, which survives in the family to the present day. Sir Christopher also employed Joseph Rose, the most celebrated plasterer of his day, to decorate Sledmere. The result has been called among the finest plaster-work in England.