Castor was founded in 2016, launching with ten solo exhibitions in twelve months, in a basement space adjacent to Goldsmiths in New Cross. Following the success of the first year’s programming, Castor relocated to Resolution Way in Deptford, where it continued to thrive within the South East London art scene. Over the next two years, the gallery’s footprint expanded twice and the former project space officially established itself as a commercial gallery. In 2022, Castor relocated to the heart of Fitzrovia where it operated for 18 months. 

Castor latest move sees them take on the historic Holy Trinity, a Grade 2 listed Church on Cloudesley Square, Islington, opening in April 2024.  Holy Trinity was constructed between 1827 - 29 and designed by Charles Barry, who was chief architect for the Houses of Parliament. Castor at Holy Trinity is split between two space, the more intimate South gallery alongside the cavernous East gallery with pitched roof rising to 5.5 metres at its highest point, boosting over 1000 sq ft of exhibition space alongside a viewing room, storage and offices.