Leonard Keir Hett was born in Epsom, Surrey, England on 9 September 1887 and was articled to Francis William Troup (1859-1941) in London from 1907 to c.1910, He also attended classes at the Architectural Association Schools in London from 1905 to 1909 and was awarded a Travelling Studentship in 1907.
Hett qualified as an architect in 1910 and commenced practice in London in 1911. From 1911 he was in partnership with Charles Denny Carus-Wilson (1886-1979), and from 1923 he was a partner in the architectural firm Searle & Searle in London. He remained associated with the practice for the rest of his career as an architect. He was also architect to Ardingly College in Ardingly, Sussex. for 18 years.
Hett mainly designed buildings in Sussex including a number of Churches. From the late 1920s to the early 1950s, he designed buildings at the The Heritage Craft Schools and Hospitals for Crippled Children [now Chailey Heritage School] in Chailey, Sussex
A design for a house by him was entered in The "Daily Mail" Ideal Houses Competition for Architects in 1927
Hett was elected an Associate of the Royal Institute of British Architects (ARIBA) in 1911 and a Fellow of the Royal Institute of British Architects (FRIBA) in 1920. He died at 11 College Road, Ardingly, Sussex on 27 November 1978
In conjunction with C.D. Carus-Wilson. A.R.I.B.A.: — House and lodge, etc., Liss, Hants; village hall, Staplefield, Sussex; carved oak reredos and lych gate, Ardingly, Sussex. Unassociated: — Cottages, etc., at Ardingly, Sussex; carved oak war memorial screen, Ardlngly, Sussex; house at Newick, Sussex; house at Turner's Hill, Sussex; cottages and (arm buildings at Haywards Heath, Sussex; additions to "Tanyards", Cuckfield, and to house at Ardlngly, Sussex: sports pavilion at Walthamstow; additions to " Monks," Balcombe, Sussex. [Source: Who's Who in Architecture 1923]
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
Who's Who in Architecture 1923. Edited by Frederick Chatterton. London: The Architectural Press, 1923