Among the former, the company has reference buildings such as those built in the United States for the University of Miami: Clinical Research Building (Leed), Cox Neuroscience and Health (Silver Leed), Robert & Judy Prokop Newman Alumni Center (Gold Leed) or the South Miami Hospital Clinical Expansion (Gold Leed).

Leed certification (Leadership in Energy & Environmental Design) is a sustainable building certification system developed by the US Green Building Council and guarantees, among other things, that a building is energy efficient and that the selection of materials has followed sustainability and reuse criteria.

In Europe, buildings such as the Olomouc Hospital in the Czech Republic, with Passivhaus certification, the National Forensic Mental Health Hospital in Portrane (Ireland), with BREEAM Very Good certification, and the Oxxeo office building in Spain (Platinum Leed) have been built in accordance with outstanding sustainability standards. 

In Latin America, OHLA’s third geographic area of reference, reference should be made to the new Curicó Hospital, which recently obtained CES certification (Sustainable Building Certification). The highly complex hospital building obtained the award thanks to its high degree of energy autonomy and its sustainability and environmental criteria.

Other unique buildings, such as Centro Canalejas Madrid, have obtained Gold Leed certification. Additionally, the La Alcaidesa hotel complex, located in San Roque, Cádiz (Spain), and the Pompano Beach Library in the U.S., also hold the same certification. These projects have been carried out using techniques and processes based on innovation, infrastructure usability, and the well-being of their users.