The Guildhall is located on the grounds where the mansion house once stood, first recorded to be located here by 1700. The house later became known as
Llwyn Isaf, whose name survives as the name of the field in front of the Guildhall. The house was purchased by the council in the early 1950s, and subsequently demolished to construct the modern Guildhall. The Guildhall's construction faced some opposition over fears its construction would lead to the destruction of the Llwyn Isaf field. There were earlier proposals after
World War II to surface the area with
tarmac and construct a bus station on the site instead. The new building was built between 1959 and 1961 and was opened by
Princess Alexandra on 25 May 1961. The building is in the
Neo-Georgian style, to a design modelled on
Stockholm City Hall by the architects Stephenson, Young & Partners. It has a red brick façade with three storeys of Georgian arched windows, a cantilevered gallery towards Llwyn Isaf, and a copper tower. The building cost £150,000 (equivalent to £ million in ). It is surrounded with flowerbeds that have been described as a "notable addition to the amenities of the town". The frontage was modified in 2018 as a security measure, blocking off the front stairs but maintaining two ramps either side of the front of the building. It was partly extended between 1980 and 1981. ==Political activity==