About Us

ONH Construction and Contracting Inc. management; For the implementation of ISO 9001: 2000 system conditions, it has established Quality Policy and Quality Objectives. Accordingly; Vision, Mission, Core Values, Policy, Strategy and targets have been established. Continuous improvement of the system’s development, implementation and effectiveness; Management review is provided during training and meetings.

ONH Construction and Contracting Inc. is committed to providing the necessary resources for optimal operation of the system.

The senior management ensures the efficient use of resources related to the service provided. The senior management ensures that the existing personnel is assigned to the departments where they can be most productive based on the level of training and the effective use of the full materials, equipment, machinery and computers required for the service.

Customer Focus

ONH Construction and Contracting Inc. accepting employer organizations, suppliers, subcontractors and employee personnel within the customer concept; The company attaches importance to the determination of customer requests and efforts to increase customer satisfaction. In our company, customer specifications and contracts are determined.

Necessary procedures and documents have been created in order to realize high quality constructions at reasonable prices and in appropriate time in line with the customer’s wishes and needs.

Quality Policy

The principles of ONH Construction and Contracting Co.’s Quality Policy are as follows;

  • To understand, meet and satisfy the needs of customers at the highest level, to remain loyal to their contracts,
  • To keep the quality and safety of our constructions at the highest level,
  • Following the technology and using it at the highest level,
  • To ensure that suppliers, subcontractors and employees develop themselves and participate effectively,
  • To fulfill the requirements of our environmental and social responsibilities,
  • To protect, develop and increase our resources,
  • To ensure the health and safety of workers at the highest level.

ONH Construction and Contracting Inc. this policy; by hanging them in places visible in all units, in-service trainings and meetings. In addition, management reviews are reviewed for continuous compliance at meetings.

Quality Qoals

ONH Construction and Contracting Inc. has established quality targets in line with its quality policy, vision and mission. Traceable and measurable quality targets have been established at all levels of our organization in order to meet customer requirements.

While establishing these targets, the structure of our sector and country, service areas, target markets and customers are analyzed; labor, procurement, R & D, financing, technological developments, etc. issues have been formed by considering the strengths and weaknesses of our company.

Company Profile

  • Commercial Title – ONH İNŞAAT VE TAAHHÜT A.Ş.
  • Trade Register Number – 309423
  • Company Address – Mustafa Kemal Mah. Dumlupınar Blv. D1 Blok Apt. No:274/8/16 Çankaya/ANKARA
  • Contact – TEL: 0312 479 46 26 FAKS 0312 479 46 25
  • Tax Administration – Maltepe V.D. 412 045 0481


Customer satisfaction, teamwork, sharing the technological developments and innovations based on an understanding that constantly follows the leading company in the industry.


Within the framework of our vision; is an exemplary organization that creates resources and value for our country, customers and employees.


ISO 9001:2015
ISO 14001:2015
OHSAS 18001:2007