The courthouse, which was designed by Michael Priestley in the
neoclassical style and built in
ashlar stone, was completed in 1746. Previously
courts had been held in any suitable building and in one case, when the court met in a public house, the fines collected over the course of a day was used to buy drinks for the jury. The building also incorporated a prison in the basement until a purpose-built facility was opened next to the courthouse in 1793. The building was originally used as a facility for dispensing justice but, following the implementation of the
Local Government (Ireland) Act 1898, which established county councils in every county, the Grand Jury Room also became the meeting place for
Donegal County Council. The purpose-built prison next to the courthouse was demolished in 1907 The building continued to be used as a courthouse until 1938 and then fell into disrepair before being renovated in the late 1980s and then being fully renovated in the early 1990s and being reopened as a Heritage Centre in 1994. ==Crime and punishment==