Sandgate was an urban district from 1894 to 1934 (having previously been part of Cheriton parish). It was added to Folkestone in 1934. With the rest of Folkestone it is now part of the Shepway District of Kent, England. In 2004, the village re-acquired civil parish status. It had a population of 4,225 at the 2001 census.
It is the site of Sandgate Castle, a Device Fort. The Device Forts, also known as Henrician Castles, are a series of artillery fortifications built to defend the southern coast of England by Henry VIII. After the King's divorce of Catherine of Aragon, England was left politically isolated, and the resulting hostility between France and Spain in 1538 aroused fears of invasion.