Samuel Dennis Walley Timmins [also known as as S. D. W. Timmins] was born in Walsall, Staffordshire, England on 23 October 1900. It is not known where or with whom he trained as an architect. He was elected a Licentiate of the Royal Institute of British Architects LRIBA) in 1932. He practised as an architect in Wolverhampton, Staffordshire throughout his career as an architect. A bungalow in Wolverhampton designed by him is discussed in Seaside Houses and Bungalows, edited by Ella Carter (London: Country Life, 1937 pp. 96-97).
In addition to his work as an architect, Timmins was also a painter. He exhibited at the Royal Birmingham Society of Artists between 1921 and 1936.
Timmins died in Wolverhampton, Staffordshire on 17 October 1951. His address at the time of his death was 2 Claregate, Tettenhall, Staffordshire
St. Jude's Court, Tettenhall Road, Wolverhampton (1934); House, Uplands Avenue, Wolverhampton (1936); and Springdale Methodist Church, Wolverhampton (1937).