GBM is guided by the basic requirements of ISO 9001 and the directives of the ift Rosenheim (Germany). ift Rosenheim is a leading International Institute for testing Windows, doors and facades and is the quality certification center. The Institute regularly leads control of the production process, equipment, facilities, raw materials and product quality at the factory. ift Rosenheim confirmed the quality of our products.

Our company is FSC^® (Forest Stewardship Council^®) certificate holder. We confirm that enterprise organised system provides visibility of raw material at the factory, starting from the delivered log and ending with the ready-made product. The manufacturing conducts ecological, economical and socially responsible forest management according to internationally recognized standards.

GBM DECLARES ENVIRONMENTAL RESPONSIBILITY FOR REDUCING ENERGY CONSUMPTION INTRODUCED EFFICIENT ENERGY MANAGEMENT IN ACCORDANCE WITH INTERNATIONAL ENERGY MANAGEMENT STANDARD ISO 50001: 2018