1721 in architecture

The year 1721 in architecture involved some significant events.

Buildings

 * Bocking Windmill, Essex, England.
 * 7 Burlington Gardens, later Queensberry House, London, Giacomo Leoni's first design for England
 * Fort King George, along the Altamaha River in the modern-day US state of Georgia
 * Ruthven Barracks in Scotland completed
 * Jackson Square (New Orleans), New France
 * Nazarbaug Palace, Gujarat, India
 * Ellingen Residence in Ellingen, Bavaria completed in its Baroque form
 * Písek Gate, Prague, Czech Republic
 * Saint Paul the First Hermit Cathedral completed as parish church of San Pablo, Laguna, Philippines

Awards

 * Grand Prix de Rome, architecture: Philippe Buache.

Births

 * March 5 – John Adam, architect, brother of Robert Adam and James Adam (died 1792)
 * March 26 - Nicolas Le Camus de Mézières, French architect (Bourse de Commerce) and author (died 1793)
 * date unknown
 * Francesco Sabatini, Sicilian architect working in Spain (died 1797)
 * Thomas Sandby, English draughtsman, watercolour artist, architect, and teacher (died 1798)

Deaths

 * February 11 – Carlo Francesco Bizzaccheri, Italian architect (born 1656)
 * June 11 – Sir Anthony Deane, English naval architect, shipbuilder and politician (born 1633)