	Stjernstedt returned to England after World War II and began working for the London County Council Housing Division. She was the first female architect to achieve grade I status at London County Council and in 1950 she became the first woman to reach senior grade I status in any British council county division. From 1951 to 1955, she led the design team for Alton East Estate, a pioneering council housing estate in Roehampton that later became grade II listed buildings.