1729 in architecture

The year 1729 in architecture involved some significant events.

• February 3 – The foundation stone is laid for the new Irish Houses of Parliament on College Green in Dublin, designed by Edward Lovett Pearce MP as the world's first purpose-built bicameral legislative building.
• Completion of Castletown House, Celbridge, County Kildare, Ireland's first Palladian mansion, designed by Alessandro Galilei and Edward Lovett Pearce for William Conolly, Speaker of the Irish House of Commons.
• Completion of Kinlet Hall, Shropshire, England, designed by Francis Smith of Warwick.
• Completion of Marble Hill House, Twickenham, near London, designed by Roger Morris.
• Completion of Sutton Scarsdale Hall, Derbyshire, England, designed by Francis Smith of Warwick.
• Christ Church, Spitalfields, and St George in the East in London, designed by Nicholas Hawksmoor, are completed for the Commission for Building Fifty New Churches.
• Chiswick House in London is designed by Richard Boyle, 3rd Earl of Burlington and William Kent.
• The Palladian Dormitory at Westminster School in London is designed by Richard Boyle.
• Fountain of Ahmed III (Üsküdar) completed.

• Grand Prix de Rome, architecture: Joseph Eustache de Bourge.

• February 6 – Giuseppe Venanzio Marvuglia, Sicilian architect (died 1814)
• June 29 (bapt.) – Thomas Atkinson, English architect working in Yorkshire (died 1798)
• November 5 – Martín de Aldehuela, Spanish architect (died 1802)
• November 24 – Jean-François Leroy, French architect (died 1791)
• Approximate date – Joseph Turner, Welsh-born architect (died 1807)

• September 13 – Colen Campbell, Scottish-born architect (born 1676)