In 1927 St Margaret's School moved to Mayfield Avenue, Malvern, and in 1931 leased the former Governor's residence, Stonington.

[1] The school was originally owned by its principal, Dora Gipson, until 1947 when she sold it to the parents and Old Girls as she needed to retire due to illness.

[5] In 2021 the two schools were formally brought together under the new name St Margaret's Berwick Grammar.

][citation needed] St Margaret's Berwick Grammar is a member of Girls Sport Victoria (GSV) and Southern Independent Schools (SIS).

[citation needed] St Margaret's Berwick Grammar has won the following GSV premierships.