Frank Windsor was born in Croydon, Surrey, England on 9 February 1876 and was articled to George Warren Cooper (1864-1923) from 1891 to 1894. He also studied at King's College, London and Birkbeck Institute in London during these years. He worked as an assistant to Alfred Hessell Tiltman (1854-1910) in 1894-95, and to Henry Hyman Collins (1833-1905), District Surveyor of the Eastern District of London, from 1895 to 1898. He attended the Royal Academy Schools in 1897.
Windsor commenced independent practice in Croydon in 1898. He was Consulting Architect to the Royal School for Deaf and Dumb Children in Margate, Kent from 1908 to 1914 and was assistant to H. H. Collins.
He was elected a Licentiate of the Royal Institute of British Architects (LRIBA) in 1910 and a Fellow of the Royal Institute of British Architects (FRIBA) in 1921. His address was given as 60 Blenheim Crescent, Croydon, Surrey in 1906; 1 High Street, Croydon, Surrey in 1906 and 1914; 40 Coombe Road, Croydon, Surrey in 1910 and 1939; 1 Station Approach in 1914 and 1926; and Station House, 134 George Street, Croydon, Surrey in 1930 and 1936. He died in Croydon, Surrey on 25 August 1939.
Three blocks of flats. Great Smith Street, Westminster, 1901; St. Augustine's Hall, Croydon, 1907; additions to Royal School for Deaf and Dumb Children, 1908-14; Albemarle Grange, Bickley, Kent; lay-out of Estate at Reedham, Purley, 1903; and Smitham Down Estate, Coulsdon, 1905; new houses and lay-out of road, Haling Park, South Croydon, 1923; Wood End, Mavelstone Road, Bickley; Wesleyan Church, Wallington, Surrey, 1907-9: King Edward VII. Hospital, Croydon, 1911-12; "Yewhurst," Furze Hill, Purley.
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