Career
His designs submitted in the competition for the new Houses of Parliament lost to Barry"s design. In London, Knowles built the confident and technically assured palazzo at 15, Kensington Palace Gardens (1854). His vast Italianate mansion at Silverton Park, Devon, for the fourth Earl of Egremont, who had inherited the title but not the great family seat, Petworth in Sussex, determined to build a rival structure.
lieutenant was not fully complete when the earl died in 1845, and after a house sale in 1892 dispersed its contents, it was demolished.
Only the stables remain. One of his sketchbooks is in the library of the Royal Institute of British Architects.