Construction of external sewerage networks, Construction of internal sewerage networks, Design of external heat supply networks and boiler houses, Fire water supply system installation, Heating system installation, Installation / construction of external water supply systems, Installation / construction of internal water supply systems, Installation of cooling and conditioning systems, Installation of fire sprinkler system, Installation of gas supply systems, Maintenance of utility systems, Project of gas supply systems, Project of heating systems, Responsible person for gas facilities (service)