Sayce was born and educated in England. He was an architect and his Melbourne-based firm Messrs Rodney Alsop & Conrad Sayce won the Hackett Competition for the design of a number of University of Western Australia buildings. His literary works include poems, short stories and adventure novels which reflect his experience of outback life and landscape. Several of Sayce's adventure novels were published in series intended primarily for boys. In about 1934 he left for South Africa, but returned to Australia in 1948. He contributed a chapter to Homes of the Golden City (1948) a book on the architecture of Johannesburg, South Africa.
Note: The Oxford Companion to Australian Literature, The Oxford Companion to Australian Children's Literature and The Bibliography of Australian Literature all incorrectly list Sayce's death year as 1935.