ISO 90012015
Quality Management System
International quality management standard built around systematically managing product and service quality, standardizing processes, and continually improving customer satisfaction.
View Certificate (PDF) →Certifications
Our management system certifications
Independent audits by BELCERT International Certification (ILAS-MS-0089 accredited) confirmed that our quality, environmental, occupational health & safety, and customer satisfaction management systems meet international standards.
Get support from our expert team for your project.
Phone+90 212 945 7465WhatsApp+90 542 144 10 42E-mailinfo@gazliyanginsondurme.comISO 140012015
Environmental Management System
International environmental management standard covering the systematic management of an organization's environmental impact, monitoring environmental performance, and maintaining legal compliance.
View Certificate (PDF) →ISO 450012018
Occupational Health & Safety Management System
International occupational health and safety standard aimed at providing a safe, healthy working environment and systematically reducing the risk of workplace accidents and occupational illness.
View Certificate (PDF) →ISO 100022018
Customer Satisfaction & Complaints Management System
International guidance standard for handling customer complaints effectively, fairly and transparently, recording them, and turning them into continuous improvement.
View Certificate (PDF) →Certification FAQ
Who issued these certifications?
Our certifications were issued following independent audits carried out by BELCERT International Certification, which holds ILAS-MS-0089 accreditation.
How long are the certifications valid?
All 4 certificates were issued on 26.11.2025 and remain valid until 26.11.2026; they are renewed through periodic audits.
How can I verify the certificate numbers?
Each certificate's own number is listed on this page; you can view the PDF documents directly to confirm the numbers and issue/validity dates.
What processes do these certifications cover?
ISO 9001 covers quality management, ISO 14001 environmental management, ISO 45001 occupational health and safety, and ISO 10002 customer complaints management — together they form the management-system framework GYS runs across the full engineering process, from site survey to maintenance.
Work with a certified team
Get in touch with questions about our quality, environmental and safety standards.