Soon after his marriage John commissioned James Wright Sanderson, a pupil of James Wyatt to substantially remodel and enlarge a smaller existing building. The newspapers show that he and his wife Lucy were living in their new home by 1797. John became High Sheriff of Berkshire in 1806. Lucy was known to be a benefactor of the poor. He died in 1821 and Lucy continued to live at Prospect House until her death in 1829. They are both buried in St Mary's Church Purley.