The year 1718 in architecture involved some significant events.

• In Pascagoula, Mississippi, the Old Spanish Fort is built.
• In Bengal, the mazar of Saint Shah Sultan Mahi Swar Balkhi is built, a single domed mosque.
• In Bavaria, Schloss Weißenstein is completed to the designs of Johann Dientzenhofer and Johann Lukas von Hildebrandt.
• In London, St Alfege Church, Greenwich, rebuilt by Nicholas Hawksmoor, is consecrated, the first completed work of the Commission for Building Fifty New Churches.
• The church of Santa Cristina, Turin, is completed under guidance of Filippo Juvarra.
• Temple in Shotover Park, Oxfordshire, an early example of Gothic Revival architecture in England.
• Willmer House in Farnham, England, a noted example of brick building.

• February – John Vardy, English neo-Palladian architect (died 1765)
• March 21 – Friedrich August Krubsacius, Dresden architect (died 1789)
• May 14 – Mario Gioffredo, Neapolitan architect, engineer and engraver (died 1785)

• September 11 – Domenico Martinelli, Italian baroque architect (born 1650)