1815 in architecture

The year 1815 in architecture involved some significant events.

• September 10–24 – The Champion (London) publishes "The Present Low State of the Arts in England and more particularly of Architecture", primarily a personal attack on John Soane written anonymously by his son George.
• The great tithe barn at Cholsey in England, the world's largest when built around 1300, is dismantled.

• St. Patrick's Old Cathedral in New York City, designed by Joseph-François Mangin, is dedicated.
• Church of St. Paul's Radcliffeboro (Charleston, South Carolina) is completed.
• St. John's Church, Philadelphia, designed by William Strickland, is built.
• St Michael's Church, Aigburth, England, designed by ironfounder John Cragg with Thomas Rickman, is consecrated.
• Kuopio Cathedral in Finland is completed.
• Armadale Castle on Skye (Scotland) is built in the style of Scottish Baronial architecture to the design of James Gillespie Graham.
• The Nelson Monument, Edinburgh, on Calton Hill, designed by Robert Burn, is dedicated.
• Dunans and Ferness Bridges in Scotland, designed by Thomas Telford, are completed.
• Waterloo Bridge, Betws-y-Coed, Wales, designed by Thomas Telford, is constructed.
• Glenfinnan Monument in Scotland, designed by James Gillespie Graham, is erected.
• Carneal House is built at 405 East Second Street in Covington, Kentucky.
• Reconstruction of Royal Pavilion, Brighton, England, in an Indian style by John Nash begins.

• Grand Prix de Rome, architecture: Pierre Anne Dedreux.

• January 11 – David Stevenson, Scottish lighthouse engineer (d. 1886)
• March 7 – Samuel Sloan, American architect working in Philadelphia (d. 1884)
• October 30 – Andrew Jackson Downing, American landscape architect (d. 1852)
• December 23 – Ildefons Cerdà, Catalan Spanish urban planner (d. 1876)
• William Harrison Folsom, American Mormon architect (d. 1901)
• John M. Trimble, American theater architect (d. 1867)

• June 5 – Robert Burn, Scottish architect (b. 1752)
• November 15 – Louis Michel Thibault, French-born architect working in South Africa (b. 1750)