List of oldest buildings in the United Kingdom

This article lists the oldest extant freestanding buildings in the United Kingdom.

In 1833 the castle became the first historic site in England to be protected by statute, though the new railway line in 1834 did demolish the castle's gatehouse and outer earthworks to the south.

Originally an abbey of the canons regular founded by King David I.

Expanded into the royal palace during the Scottish Reformation.

Built as part of fortifications around Strangford Lough.