Caerphilly Workmen's Hall was officially opened on 7 February 1925 by Walter Davies, treasurer of Caerphilly Workmen's Hall and Institute Fund for the previous twenty two years. Costing £10,000 it was designed by Walter Rosser, a Newport architect, and the building contractors were H. J. Herbert and Sons, Newport. Some £4,000 was provided by means of a grant from the Miners' Welfare Fund. This was awarded in several parts over the course of 1923-24 and came after the purchase of the ground by the Fund Committee for £2,000 in 1921.

Built using rustic brick and Averley stone dressings, the building was split into two parts. The Hall, which opened onto Castle Street, provided seating accommodation for 750 people and had two large committee rooms. The caretaker's quarters were situated above its entrace. The Institute, which opened onto Bedwas Road, contained a billiards room, games room, reading room and library. The building bears foundation stones which were laid in April 1924. Conversion of the Hall for use as a cinema took place in the summer of 1925 and resulted in a picture house with a seating capacity of 608 seats. A further grant of £500 was provided by the Miners' Welfare Fund to carry out these changes.

The hall and institute survive today.

Daryl Leeworthy, RCAHMW, 16 September 2011.

Sources: Caerphilly Journal, 8 December 1923, 9 February 1924, 12 April 1924, 14 February 1925, 4 July 1925.