 Jewson was born in 1884 of a family of the long-established Jewson timber merchants in Norwich, Norfolk, and spent all his early life in East Anglia.He went up to Gonville and Caius College, Cambridge.He served his articles in the architectural practice of Herbert [Bertie] Ibberson in London, which he ‘disliked as a place to live in permanently the longer [he] stayed there’.