Air conditioningBuilding technology/ building services (building automation)DrillingElectrical installationFire protectionHeatingRefrigerationSanitaryVentilation
Air conditioningBuilding plumbingElectrical installationGas installationHeatingPlumbing workRefrigerationRoof plumbing worksSanitaryStoves and fireplacesVentilation
Air conditioningBuilding technology/ building services (building automation)Gas installationHeatingNatural stone worksRemediation worksSanitarySolar panelsTiles and panelsVentilation