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The year 1748 in architecture involved some significant events.
- Duke Street, Bath, England, designed by John Wood, the Elder.
- Holywell Music Room, Oxford, England, the oldest purpose-built concert hall in Europe, designed by Dr. Thomas Camplin.
- Mansion House, Doncaster, Yorkshire, England, designed by James Paine, is completed.
- Margravial Opera House in Bayreuth, Bavaria, designed by Joseph Saint-Pierre with interior by Giuseppe Galli Bibiena and his son Carlo, is completed.
- Rebuilt Teatro San Samuele in Venice is opened.
- Chapel at Fulneck Moravian Settlement, Yorkshire, England, completed.
- German Church, Gothenburg, Sweden, consecrated.
- Igreja Matriz de Belazaima do Chão, Águeda Municipality, Portugal.
- Åkerö Manor in Södermanland, Sweden, designed by Carl Hårleman, built.
- Honing Hall in Norfolk, England, built.
- Garron Bridge on Inveraray Castle estate in Scotland, designed by Roger Morris and/or his kin Robert Morris, completed.