Henry Blackwall was born in Blackwood, Derbyshire, England on 12 June 1887 and was articled to John Reginald Naylor (1854-1923) and George Hanson Sale (1852-1945) of Naylor & Sale in Derby, Derbyshire. He worked as an assistant to Charles Henry Heathcote (1850-1938) of Charles Heathcote & Sons of London and Manchester. He worked as architect for the Clay Cross Company, Limited, Clay Cross, near Chesterfield. He died in 1978.
Kirk Ireton Parish Hall; new wing. "Ravenscroft", Bowdon; alterations to the Bourne", Ashovor: house at Brackenfield; Miners' Institute, Clay Cross; housing, Clay Cross. [Source: Who's Who in Architecture 1926]
Directory of British Architects 1834-1914. Compiled by Antonia Brodie, et al. Volume 1: A-K. London; New York: British Architectural Library, Royal Institute of British Architects/Continuum, 2001