This paper analyses the study of one of the most unique buildings discovered in the excavations of the medieval town of Ifach in Calp (Alicante) in the campaigns from 2012 to 2016. It is a large two-storey building with 100 m2 of internal surface area on each floor, with a guardhouse and domestic area on the ground floor and a large noble hall on the upper floor with coronella-type biformis windows. This building could be identified with a domus domini, a space of power and residences of the members and representatives of the House of Lauria in the castrum of Calp during the first half of the 14th century, being the first construction of this type of power architecture identified in the southern Valencian area.
