The all-through school was opened by Debbie Sellin, the Bishop of Southampton, in 2022[2][3] and was fully completed in 2023.

St Mark's is operated under the auspices of the Diocese of Winchester.

Rated "Good" by Ofsted,[4] it is currently educating students from ages 4 to 16.

Additionally in 1988, St Mark's Primary School was founded.

In 2020, the government initiated a project to make a new all-through school which was completed in 2022.