Haus Alst, Medieval Burgmannshof in Horstmar, Germany.

Haus Alst is a Burgmannshof, a medieval residential complex with Renaissance features in Horstmar, North Rhine-Westphalia. The protected architectural ensemble consists of several buildings that display the structure of a fortified estate.

Haus Alst was first mentioned in a document in 1217 and belonged to the Stift Vreden, so its owners changed often. In 1282 Sueder von Alstedde and his son Dietrich appear as the first known owners; in the 14th century the house was called a ministerial seat of the abbey of Vreden. Through inheritance it passed to the von Westerholt family in 1569, who rebuilt it in 1624/25 on the old foundations, giving it its present appearance.

The estate shows how influential families lived in the medieval period and the role they played in governing their region. The buildings convey a sense of power and responsibility in that era.

The site is located in the Münster region and is reachable by local transport. Visitors should note that the building is a protected monument and may not be freely accessible in all areas.

The walls use "Specklagentechnik", alternating bands of pale red brick and white-yellow sandstone, a Dutch Renaissance feature rare in Westphalia; only Merfelder Hof in Horstmar and Haus Hameren in Billerbeck share it. The model was likely Bocholt town hall.