„Sigma Invest„ Ltd. has a certificate on the basis of article 36, paragraph 6 of the Law on technical requirements for products issued by the Agency for Metrology and Technical Surveillance. In this regard, the company is able to sign contracts for maintenance of gas systems operating on natural gas and boiler rooms.

„Sigma Invest„ LTD has highly qualified engineering staff working for many years in the company, which annually pass training both in Bulgaria and abroad.

The company has more than 50 contracts with clients for maintenance throughout the country and several emergency teams.