The ruins of the tepidarium were discovered in 1848 while the Coal Exchange was built on the site.
In 1967 to 1970, the Coal Exchange was replaced by another building and the Lower Thames Street was enlarged.
Further excavations were made at the site and the remains were incorporated into the cellar of the new building, but were not open to the public.
Pottery has shown that the Roman house was erected in the late 2nd century and had at this time a north and an east wing around a courtyard.
This is of special importance as there is little known about the end of the Roman rule in Britain, and this house attests a large-scale building in use until the beginning of the 5th century.