Igmat, d.d. is the biggest private owned Institute registered for testing and certification of building materials. It employs 48 highly qualified experts with long-term experience. Their central laboratory is located in Ljubljana and there are smaller labs located on all major construction sites around the country. They started more than 50 years ago and have developed into an independent, highly qualified institution for building materials quality control and civil engineering. Their accreditation is SIST EN ISO/IEC 17025 and SIST EN ISO/IEC 17065. Moreover, they are a notified body for Construction Products Directive of the Council of Europe.