Situated on the Mall, the courthouse was built in the period 1830-1835. The imposing, classical columns that dominate the facade are cast iron, one of the earliest examples in the West. Some fine cut stone can be found on the window sills. The name plate - high up on the left - is one of the oldest in town.
The offices are currently undergoing a major renewal programme and some court staff (e.g. County Registrar and land registry) are temporarily relocated on the Breaffy Road (Cosgraves building). the Court clerk is now Spencer Street. Behind the courthouse is the motor taxation office of Mayo County Council and the Castlebar Area Engineer Office. The Environmental Protection Agency, previously located here also, has moved to a new site adjacent to the fire station.
A tunnel is supposed to link the Court House to the old Gaol opposite (i.e. the former nursing home now used by Mayo County Council for its arts, heritage and archival sections).