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The year 1728 in architecture involved some significant events.
- October 20–23 – Copenhagen Fire of 1728.
Buildings and structures
- Catedral de Nuestra Señora de la Expectación in San Luis Potosí, Mexico, is completed.
- Seaton Delaval Hall in Northumberland, designed by Sir John Vanbrugh (died 1726), is completed.
- White Lodge, Richmond Park, near London, designed by Roger Morris, is completed as Stone Lodge.
- St John's, Smith Square in London, designed by Thomas Archer, is completed for the Commission for Building Fifty New Churches.
- James Gibbs' A Book of Architecture, containing designs of buildings and ornaments is published in London, including a version of the Gibbs surround.
- Grand Prix de Rome, architecture: Antoine-Victor Desmarais.
- February 12 – Étienne-Louis Boullée (died 1799)
- February 25 – John Wood, the Younger (died 1782)
- July 3 – Robert Adam (died 1792)
- Richard Jupp (died 1799)