[3] Henry Hare won a competition to design the new building, and construction started in 1903.

It was designed in the Baroque style, built in rubble masonry with ashlar stone dressings, and was officially opened by the member of parliament, Alfred Thomas, in April 1906.

The ground floor has semicircular arches, within which the main entrance and windows are deeply recessed.

The interior is well preserved; the main entrance leads to a lobby with a stone staircase, while upstairs are the council chamber, committee room and mayor's parlour, each with original furniture.

The chamber is described by CADW as "exceptionally fine", with seating in a "D" formation, stained glass, and a vaulted ceiling on pilasters.