The national certification scheme Quality Label in Construction (ZKG in Slovenian) will celebrate its 25th anniversary in a little over a year. During this period, they developed a system and methodology and established a system of comparative evaluation/assessment of overall quality, thus laying the foundations for a national environmental certificate comparable to foreign certification schemes, e.g. the RAL Quality Mark, Blue Angel and the EU Ecolabel. Within the ZKG scheme, the criteria for the comparative evaluation/assessment of products, services, devices and systems in various fields of construction were developed and implemented.