Percival George Silley was born in Kensington, London, England on 29 July 1873. After studying at Sidney Sussex College, Cambridge, he was articled to his father, George Michael Silley (c.1843-1936). He also attended the Architectural Association in London. He commenced independent practice as an architect in London in 1899.
His address was given as 40 Warwick Gardens, Kensington, London in 1881 and 1891; 17, Craven Street, London in 1914; and 7, Banstead Road, Ewell, Surrey in 1914 and 1939. He died in Surrey on 8 April 1945
A large number of private homes in London and the Home Counties; large chemical laboratory at the East London College
Directory of British Architects 1834-1914. Compiled by Antonia Brodie, et al. Volume 2: L-Z. London; New York: British Architectural Library, Royal Institute of British Architects/Continuum, 2001