This building dates from 1842 and was the first project of the newly formed Improvement Commissioners. Their aim was to provide a suitable building to house the sulphur well. It was designed by Isaac Shutt and cost £3,000. The previous cover of the well was removed to Tewit Well where it still stands today.

The popularity of the Royal Pump Room soared as the years went by. In 1842 it had 3778 drinkers, in 1867, 11626, and in 1925, 259000.

The Pump Room is no longer functioning and, since 1953, has been a museum. It is still possible to sample the waters inside and at a free pump outside.