Preventive maintenance is the discipline of inspecting, servicing, and replacing building equipment on a planned schedule before failure occurs. The alternative is reactive maintenance — fixing things only after they break — which is almost always more expensive in total cost of ownership because emergency repairs cost more, secondary damage often follows the original failure, and tenant disruption can be severe enough to risk lease renewals or trigger rent abatements.
A well-run preventive maintenance program covers HVAC equipment (air handlers, chillers, boilers, cooling towers), electrical systems (switchgear, transformers, generators), plumbing (water heaters, pumps, backflow preventers), fire and life safety (sprinklers, alarms, emergency lighting), and the building envelope (roof, sealants, exterior caulking). Each category has standard service intervals — quarterly, semi-annual, annual — and a documented checklist that the property manager or vendor signs off after each visit.
The economic case for preventive maintenance is straightforward. Replacing a $30,000 chiller compressor that fails on a hot Friday afternoon also requires emergency vendor labor, weekend overtime rates, expedited parts shipping, and possibly tenant rent credits — easily doubling or tripling the cost. The same compressor replaced on a planned schedule during cool weather avoids all of those premiums and lets the work happen during business hours by the regular maintenance team.
Modern preventive maintenance increasingly incorporates condition monitoring through IoT sensors and building automation systems. Vibration sensors on rotating equipment, temperature sensors on electrical connections, and runtime tracking on motors all generate data that can be used to predict failures before they happen. This 'predictive maintenance' is the next generation of preventive maintenance, and is particularly valuable for high-value equipment where failure is expensive and failure precursors are detectable.
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