Lap Kei Engineering (Holdings) Limited, an investment holding company, provides engineering services for building services systems in Hong Kong. The company operates through Building Services Engineering Work; and Maintenance, Repair, and Other Services segments. It engages in the supply, installation, and maintenance of mechanical ventilation and air-conditioning, electrical, plumbing and drainage, fire, and other related systems. The company also provides maintenance and repair services for building services systems, as well as engages in the replacement of parts.