The contract was changed in 1944, and the Bay-class ship was laid down on 31 August 1944, launched on 29 March 1945, and completed on 11 October 1945 after the end of hostilities.

[2] In March Tremadoc Bay was deployed for training and emergency duties with Plymouth Local Flotilla.

These ships were transporting Jewish illegal immigrants, detained from SS Exodus while attempting to enter Palestine, back to Europe.

[2] Tremadoc Bay then resumed Local Flotilla duties at Plymouth, remaining there until April 1951, when she was decommissioned and put into Reserve at Devonport.

In 1958 she was placed on the Disposal List, in 1959, prior to being sold to an Italian shipbreaker, Tremadoc Bay made an appearance in the Film Silent Enemy, the film of Lt. Lionel Buster Crabb RNVR about the work defusing mines in Gibraltar during WW2, some time after this, she was taken under tow, and arrived at Genoa on 18 September for scrapping.