In 1800, Newlands Manor was leased by Admiral William Cornwallis but soon afterwards it was burnt down. The present house was designed by a Southampton architect but this building can not be seen from the road.
Mrs. Anna Whitby, came to live there as a companion to Admiral William Cornwallis and in 1819 when he died, she inherited the Manor. She built up the estate from 60 acres to 1,900 acres. Anna's daughter, Theresa, who married Frederic R.West of Ruthin Castle, inherited Newlands Manor in trust in 1850, and in 1886 it was handed to her second son William, who added Cornwallis to his surname. The Manor became the place for wild parties with visits from Edward VII and the Kaiser.
Col. William West died in 1917 and the property was disposed of by his son George, who had married Lady Randoph Churchchill. Newlands Manor was sold by auction to Sir John Power, M.P. for Wimbledon. The House was then sold again in 1948, and converted into private homes.