The year 1811 in architecture involved some significant events.
Buildings
Argyll House, London, designed by William Wilkins is completed
The House wing of the United States Capitol, designed by William Thornton and Benjamin Latrobe is completed.
Events
March – The Commissioners' Plan of 1811 determines the grid plan of Manhattan. John Nash prepares his plan of the Regent Street and Regent's Park areas of London.
Awards
Grand Prix de Rome, architecture: Jean-Louis Provost.
Births
c. May – Thomas Larkins Walker, British architect (died 1860) July 13 – George Gilbert Scott, English architect (died 1878)
Deaths
May 5 – Robert Mylne, British architect (born 1734) August 22 – Juan de Villanueva, Spanish architect (born 1739)