Johnston was born in Armagh, Ireland, the eldest son of William Johnston by his first marriage to Margaret Houston and older brother of architect Francis Johnston.
He married his cousin Susanna Barnes while his brother married her sister Anne.[1] Neither him nor his brother Francis are recorded as having any children.
Daly's ClubAn illustration of the stamp and imprint office on Foster Place from the Gentleman's Magazine in 1790.
He is first recorded in Dublin as working on the Rotunda Assembly Rooms in October 1784-86 where he was the supervising architect based on a design by Frederick Trench which may have had some modifications by James Gandon.[3]
He is later recorded as developing part of Eccles Street in 1793. A street in which he was later to live along with his brother Francis.
In 1789-90, he is recorded as presenting the design for the unified facade of Daly's Club on College Green and the Stamp and Imprint Office with frontage onto Foster Place although the building was only used for this purpose for a short time.[4] It appears Johnston's design for Daly's Club was taken from a drawing submitted to the wide streets commissioners by a different unknown architect.
↑ "Aldborough House". www.dia.ie. Dictionary of Irish Architects. Retrieved 14 July 2025.
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