The structure, which was commissioned as a Calvinistic Methodist Chapel, now accommodates the offices and meeting place of Caerphilly Town Council.

The building was commissioned as a Calvinistic Methodist Chapel,[1] and erected on a mound (Welsh: twyn) to the southeast of Caerphilly Castle.

[6][7] Meanwhile, following significant population growth, largely associated with the mining industry, a local board was established in Caerphilly in 1893.

[10][11][12] Bron Rhiw ceased to be the local seat of government when the enlarged Rhymney Valley District Council was established in 1974.

A new canted frontage, with an oriel window on the first floor, was added at the north end, a new section was added at the south end, and the height of the tower was increased by the insertion of some stained glass windows below the mansard roof.