The courthouse, which was designed by Sir Richard Morrison in the neoclassical style and built in ashlar stone, was completed in 1832.

[1] It was built beside the new gaol (now the site of Roscommon garda station) to replace the previous courthouse, which is now known as Harrison Hall and which currently houses a branch of the Bank of Ireland.

[6] The county council moved to Áras an Chontae in December 2015, leaving the courthouse for the sole use of Roscommon Circuit and District Courts.

[7][8] In December 2022, due to the dilapidated condition of the courthouse, the sittings of Roscommon Circuit and District Courts were moved to a temporary facility in the former Fairyland dance hall on the Racecourse Road.

[9][10] The design involves a symmetrical main frontage with five bays facing Abbey Street; the central section of three bays, which slightly projects forward, features a short flight of steps leading up to a hexastyle portico with Doric order columns supporting an entablature and a frieze.