[3] The foundation stone for the new building was laid on 10 April 1767:[2] it was designed by Sir Robert Taylor in the neoclassical style, built in rubble masonry and completed in 1777.

Two of the leaders of the Rebecca Riots, John Jones (Shoni Sguborfawr) and David Davies (Dai'r Cantwr), were convicted in the courtroom in December 1843 and sentenced to be transported to Australia.

[13] The guildhall was also the venue in July 1966 for the acceptance speech given by Gwynfor Evans, the first politician elected to represent Plaid Cymru at Westminster.

[16] Scenes from the television series, Keeping Faith, were filmed in the building in October 2017,[17] and a programme of refurbishment works, which involved the conversion of the ground floor into a restaurant and cafe, was carried out at a cost of £1 million and completed in 2019.

[20] There are also portraits by Thomas Brigstocke of General Sir William Nott[21] and of the local Members of Parliament, John Jones of Ystrad[22] and David Morris.