Renovation of historic centre Castra in Ajdovščina

The city of Ajdovščina with its rich historical background and strong spatial identity required a subtle approach to accentuate its existing qualities and yet uncovered layers. Origins of former Roman fortress Castra ad Fluvium Frigidum (3rd – 5th century BC) are still a part of the nowadays historic centre. The remaining parts of fortification walls and towers as well as the geometrical structure of built tissue are deeply embedded in a complex system of squares and streets.
The Lavričev square as the central and largest square is defined by its three dominant building facades which are determining the main edges of the square. Forming the rhythm of green elements, horizontal (pergolas) and vertical (trees), the presence of main square edges is emphasized creating an ambiance of seating areas in the shade. The central area of the square is kept clear for multipurpose use. The water element in form of the three fountains is placed in the eastern smaller square in the former baroque castle courtyard accompanying the line of the main connection to the nearby river Hubelj.
Castra was based on a double slightly shifted orthogonal grid with its basic measurement unit of a double roman step – passus (147,87 cm). The basic pavement stone element (74 x 37 cm) was defined by half of the passus. Stone elements are positioned with a longer side in direction of Cardo and with a shorter side in direction of Decumanus. Throughout the general pavement grid, underground roman wall ruins are presented with smaller size stone elements. The use of stone pavement ends with city wall presentation and continues with site-cast concrete for surrounding streets. Materials used are based on local origin: stone pavement is made of local limestone, the site-cast concrete paving contains an aggregate of local origin.
The central point of the Roman ruins presentation is positioned in the southern part of Lavričev square. Original archaeological findings of the Roman building complex are presented on-site in four presentation fields allowing access to the level of ruins and offering seating areas on its edges.


Ravnikar Potokar arhitekturni biro; Ajdin Bajrović, Robert Potokar, Matej Fornazarič, Javier Carrera Arias, Mina Gutović

Chief conservator
Patricija Bratina

Municipality of Ajdovščina

Year of completion

Ajdovščina, Slovenia

Total area
6.300 m2

Virginia Vrecl, Matic Slemič

Project Partners

Kolektor CPG d.o.o., Nova Gorica, Edil inženiring d.o.o., Nova Gorica, Magelan skupina d.o.o., Kranj, Avgusta d.o.o., Idrija

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