1909 – Post Office, Castleblayney, Co. Monaghan Former house circa 1860 converted for use as post office in 1909, to designs by John McGahon. Still in use today but missing the simple curvilinear pediment to the parapet.
1938 – County Hospital, Monaghan, Co. Monaghan Architect: John F. McGahon & Son Built on the site of the old county gaol and incorporating some of the footprint of the demolished building.
1942 – Lyric Cinema, Brew’s Hill, Navan, Co. Meath Architect: John F. McGahon & Son Many cinemas in smaller urban centres in Ireland were designed in an Art Deco or early modernist style.