In 1877, the Third Middlesex County Asylum was opened in Belmont, with space for 1,700 patients.

During the 20th century, Banstead Mental Hospital was formed for the workers at the renamed facility.

[1] In the 1933–34 season, Banstead Mental Hospital entered the FA Cup for the first time, defeating Leyland Motors in the extra preliminary round to reach the preliminary round.

In the 1933–34 season, Banstead Mental Hospital reached the third qualifying round of the FA Amateur Cup, defeating the likes of West Norwood and Carshalton Athletic, before losing 3–0 to Redhill.

[1] Following World War II, the club, now renamed to Banstead Hospital, once again entered the FA Cup and the FA Amateur Cup, losing 2–0 against Metropolitan Police in the preliminary round and 6–2 against Redhill in the second qualifying round respectively.