In 1934, at the age of 20, Hulbert moved to London. She later became a model, secretary and student with the Euston Road School of artists, which was founded in 1937, and became friends with Victor Pasmore, William Coldstream, and Claude Rogers. Following the Second World War, she moved to the Holland Park neighborhood of London and began to teach art at the Camden School for Girls. She later would teach at the Central School of Art and Design, where she remained until her retirement. In 1958 she had a solo exhibition at the Leicester Galleries in London. In 1962 Hulbert had a mid-career retrospective, entitled Thelma Hulbert: paintings and drawings, 1937-1962, at the Whitechapel Gallery, which was organized by Bryan Robertson.
In April 1998 Elmfield House re-opened as the Thelma Hulbert Gallery, a public art gallery hosting a programme of contemporary art and craft exhibitions alongside a permanent collection of Thelma Hulbert's work. It also has workshops and activities for the community, Learning Room with kids’ art & craft materials, a shop and refreshments area.
Hulbert's work can be found in a number of public collections, including:
- "About Thelma Hulbert" Archived 2014-10-06 at the Wayback Machine, Thelma Hulbert Gallery, Retrieved 19 September 2014.
- Wright, Iona. "Obituaries: Thelma Hulbert", The Independent, Retrieved 19 September 2014.
- "Thelma Hulbert Gallery expands" Archived 2012-09-04 at the Wayback Machine, Arts Council, Retrieved 19 September 2014.
- "Thelma Hulbert", Tate, Retrieved 19 September 2014.
- "The blue screen, (1956) by Thelma Hulbert", Art Gallery of New South Wales, Retrieved 19 September 2014.
- "Thelma Hulbert", BBC Your Paintings, Retrieved 19 September 2014.