The Arrowsmith campus contains the original building, and is situated in Edinburgh Drive near Ickenham tube station.

The Cardinal Hume campus, though older, did not become part of Douay until 1974, formerly being Swakeleys School for Girls, though this was not its first identity.

[citation needed] This site is nearer to Hillingdon tube station on Long Lane.

[7] At the end of the 2019 academic year that school had a progress 8 score of 0.22, making it above average according to the Department for Education.

[8] The school has considerably more pupils entered for the English Baccalaureate subjects than the Hillingdon and National averages.