Building technology/ building services (building automation)CleaningElectrical installationGas installationHeatingSanitaryStoves and fireplacesVentilation
Carpentry worksCrane work and rentalDoors and gatesFencingFlooring worksInsulation technologyInterior constructionLightning protectionMetal constructionParquetryRemediation of hazardous substances / Asbestos abatementRemediation worksRoof sealRoofing worksSolar panelsStoves and fireplacesTiles and panelsWindows