ILF Group Holding GmbH

ILF Group Holding GmbH, commonly known as ILF Consulting Engineers, is an international engineering and consulting firm headquartered in Innsbruck, Austria. Founded in 1967 by Pius Lässer as an engineering office, the company has grown into a global network with more than 3,700 employees across over 45 office locations on six continents. ILF is privately owned by the founding families, which allows it to maintain complete independence with no affiliations to manufacturers, suppliers, or financial institutions. The firm operates across four main business areas: Energy & Climate Protection, Water & Environment, Transportation & Urban Spaces, and Resources & Sustainable Industry. Its services span consulting, planning, engineering, and project management for technically demanding industrial and infrastructure projects. ILF has successfully executed over 12,000 projects in more than 150 countries, combining local presence with international expertise. ILF's history is marked by significant infrastructure contracts, including the Transalpine Pipeline, the Arlberg Road Tunnel, the Brenner Base Tunnel, and major water transmission systems in Saudi Arabia and Algeria. The company has consistently adapted to global challenges, recently focusing on the energy transition, environmental protection, and sustainable industrial processes. Its commitment to sustainability is reflected in initiatives such as the annual ILF Sustainability Report. With a strong emphasis on client interaction and stakeholder integration, ILF continues to expand its global footprint while maintaining its core values of independence, quality, and innovation. The company remains a key player in the engineering and consulting sector, driving progress in critical infrastructure and sustainable development worldwide.

ILF Group Holding GmbH was founded in 1967 by Pius Lässer as an engineering office in Innsbruck, Austria. The company's early years were marked by significant contracts in the oil and gas sector, including the Transalpine Pipeline (TAL) and water treatment projects such as the Dornbirn Wastewater Treatment Plant. In 1969, Adolf Feizlmayr joined the company, forming the ILF partnership and opening an office in Munich, Germany. Throughout the 1970s and 1980s, ILF expanded its portfolio to include major infrastructure projects worldwide. Notable contracts included the Arlberg Road Tunnel in Austria (1972), the Iraq–Turkey Pipeline (1974), the Riyadh Water Transmission System in Saudi Arabia (1977), and the Hannover–Würzburg High-Speed Railway Line in Germany (1980). The company also established new offices in Riyadh (1977), Lagos (1981), and Washington DC (1986), signaling its growing international presence. In the 1990s and 2000s, ILF continued to diversify, undertaking projects in water transmission, dams, gas storage, and transportation. The company's expertise in tunnelling and pipeline engineering became widely recognized. By the 2010s, ILF had solidified its reputation as a leading independent engineering consultancy, with a focus on sustainable solutions. Recent years have seen ILF actively contribute to the energy transition, environmental protection, and sustainable industrial processes. The company publishes an annual Sustainability Report and has been involved in projects such as the Brenner Base Tunnel and the Amiral IWWTP in Saudi Arabia. With over 55 years of experience, 12,000+ projects executed, and a presence in more than 150 countries, ILF remains privately owned by the founding families, ensuring its independence and long-term commitment to quality and innovation.

• 1986

  New office in Washington DC, USA.

• 1981

  New office in Lagos, Nigeria.

• 1980

  Contract for Hannover–Würzburg High-Speed Railway Line, Germany.

• 1977

  Contract for Riyadh Water Transmission System from Jubail to Riyadh (500 km); new office in Riyadh.

• 1974

  Contract for Iraq–Turkey Pipeline from Kirkuk to Iskenderun (1,000 km).

• 1972

  Contract for Arlberg Road Tunnel, Austria (14 km).

• 1969

  Adolf Feizlmayr joins the company to form ILF partnership; office in Munich opened.

• 1967

  Pius Lässer establishes engineering office in Innsbruck, Austria.

• 1967

  First oil and gas contracts for Transalpine 'TAL' Crude Oil Pipeline and expansion of tank farms in Ingolstadt and Trieste.

• 1967

  First water contract for Dornbirn Wastewater Treatment Plant, Austria.

Independent, privately owned engineering and consulting firm delivering sustainable solutions for complex infrastructure and industrial projects worldwide.

• Energy & Climate Protection

  Consulting and engineering services for energy transition, renewable energy, and climate protection projects.

• Water & Environment

  Services for water transmission, wastewater treatment, and environmental protection.

• Transportation & Urban Spaces

  Engineering for tunnels, railways, roads, and urban infrastructure.

• Resources & Sustainable Industry

  Consulting for optimizing production processes and sustainable industrial practices.

1. 1ILF Consulting Engineers – Sustainable Solutions | ILF.comilf.com
2. 2History | ILF.comilf.com
3. 3About ILF Group | ILF.comilf.com
4. 4ILF Group Holding GmbH - Wikidatawikidata.org