Maintenance rooms (synonyms: maintenance closets, utility closets, electrical rooms) are locations within a building or structure that house critical infrastructure. There may be water heaters, electrical breakers, elevator machinery, and other elements located within these rooms. They may connect to maintenance tunnels, elevator shafts, or the ventilation system. They may contain catwalks, pipes, conveyor systems, and ladders. They may require a key or keycard to enter.

Consider what types of maintenance can be performed from this location. Can the power be shut off, servers reset, or hangar bays doors opened? Maintenance rooms, like maintenance tunnels, provide worldbuilders designing game-oriented and narrative worlds opportunities for characters to alter their local environment. In narrative worlds, maintenance rooms may be the only location from which some pressing problem can be fixed – but getting there may be difficult.