Tower houses appeared on the Islands of Ireland and Great Britain starting from the High Middle Ages. They were constructed in the wilder parts of Great Britain and Ireland, particularly in Scotland, and throughout Ireland, until at least up to the 17th century. The remains of such structures are dotted around the Irish and Scottish countryside, with a particular concentration in the Scottish Borders where they include peel towers and bastle houses. Some are still intact and even inhabited today, while others stand as ruined shells.

Peel towers are small fortified keeps or tower houses, built along the English and Scottish borders in the Scottish Marches and North of England, mainly between the mid-14th century and about 1600. They were free-standing with defence being a prime consideration in their design, although "confirmation of status and prestige" also played a role. Additionally, they functioned as watch-towers, where garrisoned personnel could light signal fires to warn of approaching danger.