|Covid-19|November 26 – The Ellesmere Canal's Pontcysyllte Aqueduct, designed by Thomas Telford and William Jessop, is opened on the border of Wales, the tallest and longest in Britain.
Theatre Royal, Bath, England is opened.
Evangelical Lutheran Church of Saint Mary in Saint Petersburg is built.
Haga Palace in Stockholm, Sweden, designed by Carl Christoffer Gjörwell, is completed.
Grand Prix de Rome, architecture: Auguste Guenepin
June 9 – Victor Baltard, French architect (d. 1874)
July 26 – John Miller, Scottish railway civil engineer (d. 1883)
Peter Ellis, English architect working in Liverpool (d. 1884)
James Salmon, Scottish architect (d. 1888)
Peter Atkinson, English architect (b. 1725)
1805 in architecture Wikipedia
The year 1805 in architecture involved some significant events.