Maintenance in building services plays a critical role in ensuring the safety, efficiency, and longevity of all structural, electrical, mechanical, and plumbing systems within a facility. To achieve optimal performance and minimize operational disruptions, organizations adopt various maintenance policies and strategies. These strategies can broadly be classified into preventive, predictive, corrective, and condition-based maintenance. Each approach is tailored to specific operational needs, asset criticality, and cost considerations. Preventive maintenance is a planned approach aimed at reducing the likelihood of equipment failure before it occurs. This strategy involves regular inspections, servicing, and replacement of components at predetermined intervals. For example, air-conditioning systems may undergo scheduled filter changes, duct cleaning, and lubrication of mechanical parts. The primary advantage of preventive maintenance is its ability to extend the lifespan of equipment, improve safety, and reduce unplanned downtime. It is particularly effective for assets that are critical to building operations, such as elevators, fire alarms, and electrical distribution panels. Preventive maintenance relies heavily on historical data, manufacturer recommendations, and industry best practices to determine appropriate service intervals. Predictive maintenance, on the other hand, uses condition-monitoring tools and techniques to assess the real-time performance of equipment. This strategy focuses on detecting early signs of deterioration or abnormal operation to intervene before a failure occurs. Technologies such as vibration analysis, thermal imaging, oil analysis, and ultrasonic testing are commonly employed in predictive maintenance programs. In building services, predictive maintenance can be applied to pumps, motors, chillers, and boilers, allowing maintenance teams to schedule repairs only when indicators suggest potential failure. This approach reduces unnecessary interventions while optimizing resource allocation and minimizing operational disruption. Corrective maintenance is typically performed after a fault or malfunction has been identified, aiming to restore equipment to its normal operating condition.