Designed by I/O architects, the Observation house is located on a hill in the highest corner of a village amid an agricultural area in Northeast Bulgaria. The site of the project is distinguished both by its panoramic views and distant visibility. In order to strengthen them, a part of the program is located in the seemingly blind bastion-like volume and the living area is elevated high on it.
This brings view completion up to 360 degrees and privacy in the fully opened space above. The pitched roof connects geometrically the upper volume with the base and adds complexity to the interior space while the oversized eaves connect it to the little meadow around and exaggerate the hovering effect of the slim metal structure.
The proportion and the materiality of the solid base give it the appearance of an infrastructural object that define the edge of the village and conceals the ambitious program of the house. The only perforation leads to the cave-like space of the entrance hall/garage. The materiality of the interior spaces is dominated by local species of wood cladding, which balances the roughness of the entire structure and its surroundings.
Project Info:
Architects: I/O architects
Location: Sofia, Bulgaria
Area: 980 m²
Project Year: 2015
Photographs: Assen Emilov
Project name: Observation House






























Isabelle Laurent is a Built Projects Editor at Arch2O, recognized for her editorial insight and passion for contemporary architecture. She holds a Master’s in Architectural Theory from École Nationale Supérieure d’Architecture de Paris-Belleville. Before joining Arch2O in 2016, she worked in a Paris-based architectural office and taught as a faculty adjunct at the École Spéciale d’Architecture in Paris. Isabelle focuses on curating projects around sustainability, adaptive reuse, and urban resilience. With a background in design and communication, she brings clarity to complex ideas and plays a key role in shaping Arch2O’s editorial
