The core activity of Estia is in the field of building physics, particularly in providing services and solutions for sustainable and energy-efficient construction. This includes: building physics expertise and consulting, diagnosis and renovation of buildings, development of software for analyzing and optimizing building performance, building stock management, and research and development in the field of building physics and sustainable construction. The company also offers specific services such as natural ventilation and air conditioning, thermal performance and insulation, daylight utilization and lighting, patrimonial management and renovation, and parking management. Estia works closely with the École polytechnique fédérale de Lausanne (EPFL) and has developed a method for analyzing real estate investments. The company has also carried out a variety of high-profile projects for public and private clients.