Preventive maintenance

Preventive maintenance is the periodic inspection and servicing of building components, performed on a schedule, to catch problems before they cause failure. The building equivalent of an annual car service: not because the car is broken, but because the regular service catches the problems that would break it if left alone. Typical examples are annual boiler or heat pump servicing, chimney sweeping, gutter cleaning before winter, electrical installation checks, fire safety equipment inspections, gas safety checks.

The mechanism: preventive maintenance has two costs attached to being skipped, and both are usually larger than the maintenance itself. The direct cost is the failure the maintenance would have caught (small leak becomes large leak, degraded seal causes compressor failure). Indirect cost is the voided warranty, which often dwarfs the rest. A EUR 150 annual service skipped for three years can turn a EUR 3,000 warranty repair into a EUR 3,000 out-of-pocket repair.

The distinction matters at three moments. When budgeting, preventive is predictable and corrective is not. Before buying a component, check the warranty conditions, which usually require documented annual service. The third moment arrives when the boiler stops in February and the manufacturer asks for the service log.

Sibling frame: preventive is one of two practices inside planned maintenance; the other is lifecycle maintenance (the longer-horizon view that anticipates the eventual replacement and decides which preventive work is worth doing on which component). The mode opposite planned, considered as a whole, is corrective maintenance (reactive repair after failure). Preventive is what keeps the lifecycle honest, getting components to the end of their possible life rather than to a shortened one.