Survey Data

Reg No




Categories of Special Interest

Architectural, Artistic, Historical, Social

Original Use

Building misc

In Use As

Building misc


1820 - 1895


316126, 233614

Date Recorded


Date Updated



Attached double-height round-plan entertainment extension located northeast of Mansion House, built 1821, with access corridor and porch to west, and service wings to south and southwest. Remodelled 1892. Conical slate roof, with shallower pitch towards central round louvered lantern with vented cylindrical stack above, and having metal access stairs. Profiled metal gutter on metal brackets fixed to rendered frieze. Replacement aluminium rainwater goods to service wings. Flat roof to west access corridor and pitched and hipped roofs to service wings. English garden wall bond brown brick walling, having relieving arches to upper portion of drum over stringcourse, stucco walling to west entrance, and stepped parapet above with urn and Dublin City coat of arms. Window openings to service wings only, having square-headed plain reveals, brick voussoirs, granite sills and six-over-three pane horned timber sliding sash windows except for two-over-two pane windows to Schoolhouse Lane. West entrance recessed between Mansion House and Supper Room, having square-headed deep moulded architrave with inset barley-twist detail, double timber multiple-pane doors divided by fluted pilaster, with fluted quadrant pilasters to sides. Paved access path from Dawson Street, with elevations generally abutted and not visible from street level.


The Round Room is part of a complex of buildings at the Mansion House. The Round Room was constructed in 1821 to designs by John Semple in six weeks, to host a civic banquet in honour of the visit of King George IV. The building has witnessed a number of historic events, including the meeting of the first parliament of the Republic, Dáil Éireann, on the 21st of January 1919. Samuel Lewis described the Round Room in his Topographical Dictionary of 1837 as follows: 'externally a plain edifice of brick on a detached and receding site on the south side of Dawson-Street; the interior contains some large apartments fitted up in an antiquated style…Beyond this is the ball-room, used also for civic dinners [and] wainscoted with Irish oak…A door from the ball-room opens into a noble rotundo, 90 feet in diameter, round which is continued a corridor five feet wide; the walls are painted in imitation of tapestry, and the room is covered with a dome; in the centre is a lantern, by which the apartment is lighted; it was built in 1821 expressly for the reception of George IV, who honoured the corporation with his presence at dinner'. Casey also refers to a description by John Wilson Croker, describing it as 'the interior circular court of a Moorish Palace open to the sky: the battlements were a gallery walled with ladies, music and a company of halberdiers, in Spanish dresses of light blue silk, as a guard of honour to the king'. Today, the hall is much altered; Victorian remodelling in 1892 by Spencer Harty and G.C. Ashlin included the insertion of a balcony, round clerestory lights and pilasters that have in turn been removed and replaced by a concrete gallery and dais. Much of the interior is now masked by extravagant lighting effects and the original roof structure was replaced in 1999 by Dublin City Council. Although having a fairly functional exterior, largely screened from public view by the surrounding civic complex, the Round Room makes an important contribution to the site and enhances the historic and civic significance of the complex.