History
This success story, whose foundations were laid in 1944 by the late Mehmet Kalyoncu, began to take shape step by step when the late Hasan Kalyoncu and Cemal Kalyoncu founded Kalyon İnşaat in 1974.
Since then, at Kalyon İnşaat we have built lasting works for future generations in Türkiye and around the world, contributing to economic and social development both at home and in the regions where we operate. These include globally recognized landmarks such as İGA Istanbul Airport, the world's first TRNC Subsea Water Transmission Pipeline, Europe's largest advanced biological wastewater treatment plant, Ataköy Advanced Biological Wastewater Treatment Plant, Türkiye's and Europe's longest and largest diameter natural gas pipeline, TANAP LOT 4, and extensive motorway, metro and railway networks. In building infrastructure and buildings, we have laid some of the strongest foundations for Türkiye's future.
Today, with more than 80 years of experience, engineering excellence and an innovative vision, we have become the strong brand behind projects that transform cities, secure energy and create value for society. We continue to work with the same conviction on every new project, building our country's future.
