OYAK Inşaat commenced operations in 1982 with the aim of providing OYAK members with low-cost housing built to specified standards as part of OYAK’s social services in the housing sector. The company undertakes the design, construction and installation of a wide range of structures, including residential buildings, hospitals, industrial facilities, tourism facilities and military facilities, and also provides consultancy services.

In addition to its expertise in residential construction, the company has extensive experience in hospital construction and has undertaken the construction and renovation of various hospitals and healthcare facilities in Istanbul, Ankara, Kütahya, Erzurum, Denizli, Zonguldak, Yalova, Bartın, Bingöl, Düzce and Van.

Building on its expertise in residential and hospital construction, the company also contributes to the investments of OYAK Companies and has accumulated extensive experience in the construction of industrial facilities, military commissaries, hotels, business centers, ports, pipelines, roads, military clubs, military facilities, residential quarters and similar structures.

Tekfen İnşaat

Engineering and contracting is another core area of activity for Tekfen Holding A.S., which became part of OYAK Companies in July 2026. With roots dating back to 1956, the business has a long-standing track record of integrating engineering, procurement, manufacturing and construction processes. Operations are primarily carried out under the Engineering, Procurement and Construction (EPC) model. Depending on project requirements, services can also be provided through alternative project delivery models incorporating financing support and management-focused approaches. Long-standing engineering and project management expertise, Tekfen İnşaat operates in sectors requiring a high degree of technical specialization, including energy, oil and natural gas, petrochemicals, industrial facilities, transportation and infrastructure, and has successfully delivered numerous projects worldwide.

Tekfen İnşaat ranks among Türkiye’s leading contracting companies, backed by extensive international operating experience, a long-established track record and the ability to deliver end-to-end turnkey solutions.

Established in 1984 to provide engineering services to Tekfen İnşaat, Tekfen Mühendislik continues to provide engineering services for projects undertaken by Tekfen İnşaat as well as for industrial facilities, transportation and infrastructure projects, drawing on its extensive experience and client-focused approach.