The Company has a certified Quality Management System in compliance with the following international standards:
ISO 9001:2015 by auditors of BVQI Bureau Veritas  Bulgaria Ltd with certificatesBureau Veritas Certification Holding SAS – Italy Branch, until 07.09.2026 № BG006045
ISO 14001:2015 by auditors of BVQI Bureau Veritas  Bulgaria Ltd with certificatesBureau Veritas Certification Holding SAS – Italy Branch,  until 14.04.2029 № BG006046
ISO 45001:2018 by auditors of BVQI Bureau Veritas  Bulgaria Ltd with certificatesBureau Veritas Certification Holding SAS – Italy Branch until  03.09.2029 №: BG006047
ISO 39001:2014 by auditors "NJN" Ltd with certificate  № 21/016 until 29.03.2027

Transstroy - Varna AD is a member of  The Bulgarian Construction Chamber
I - st group : High-rise construction works, adjacent infrastructure, electronic communications networks and facilities of Categories -I -V, certificate № I – TV 028728
II-nd group: Transport infrastructure buildings of Categories I-IV, certificate II - TV 008383;
III-rd group: Power infrastructure buildings of Categories -ІІ-V, certificate III - TV 009752
IV-th group: Public infrastructure buildings of Categories -I-V, certificate  - № IV - TV 012759