Special works on the arrangement of external engineering networks and structures and internal engineering systems, including:

• cold and hot water supply networks, centralized sewerage for domestic, industrial and storm drains, installation of internal water supply and sewerage systems;
• power supply networks, and outdoor electric lighting devices, internal electric lighting and electric heating systems;
• lines and internal communication systems, radiotelecommunications and television. – internal central heating systems;
• ventilation, air conditioning, pneumatic transport and aspiration.