A question many facility managers ask: is it better to invest in regular preventive maintenance, or just deal with faults when they happen? The short answer: preventive maintenance is cheaper and safer in the long run. This guide explains why, and how to build a balanced maintenance system.
Defining the Two Types and Their Importance
Preventive Maintenance
This is pre-scheduled maintenance carried out regularly regardless of whether a fault exists. Its goal: early detection of problems before they worsen and extending the life of assets.
Emergency / Corrective Maintenance
This is maintenance carried out in response to an existing fault or malfunction. It is divided into two types:
- Immediate emergency: A complete shutdown or a danger requiring immediate intervention
- Deferred corrective: An existing fault that doesn't stop work and can be postponed
📌 Note: Emergency maintenance isn't always bad — some faults can't be anticipated no matter how good the preventive program is. The goal is to reduce it, not eliminate it entirely.
A Comprehensive Comparison Between the Two Types
| Aspect | Preventive maintenance | Emergency maintenance |
|---|---|---|
| Timing | Pre-scheduled | When the fault occurs |
| Immediate cost | Regular and predictable | Variable and usually higher |
| Long-term cost | Much lower | Much higher |
| Downtime impact | Low (scheduled in advance) | Sudden and possibly large |
| Planning | Easy and organized | Difficult and rushed |
| Pressure on the team | Low | High |
| Asset lifespan | Longer | Shorter |
Why Is Preventive Maintenance Cheaper in the Long Run?
The logic is simple but many overlook it:
A practical example: the air-conditioning unit
- Monthly filter cleaning: A small cost, and the unit's life is extended
- Neglecting the filters: The unit works harder, electricity bills rise, and the compressor fails after two years
- The compressor's cost: May reach ten times the cost of preventive maintenance over two years
💡 A reference figure: Studies in the facility management sector indicate that every riyal spent on preventive maintenance saves between 3 and 5 riyals in emergency maintenance and repair costs.
The Hidden Costs of Emergency Maintenance
- Production or work stoppage during the repair period
- Higher spare-parts prices when bought urgently
- Emergency call-out fees outside working hours
- The fault's impact on the rest of the connected systems
- Operational strain on the team
How Do You Build an Effective Preventive Maintenance Program?
An effective program goes through six steps:
- Inventory the assets: A list of all the systems and equipment in the facility
- Classify priorities: Which systems cause the most damage when they fail?
- Set the maintenance frequency: For each system according to the manufacturer's recommendations and usage
- Prepare the inspection checklists: What exactly is inspected on each visit?
- Assign the staff: Who carries it out and what are their qualifications?
- Documentation and follow-up: Recording every operation and reviewing the results periodically
The Preventive Maintenance Schedule by System Type
| System | Monthly | Quarterly | Semi-annual | Annual |
|---|---|---|---|---|
| Split air-conditioning | Cleaning filters | Checking gas, pressure | Comprehensive cleaning | Full electrical inspection |
| Central air-conditioning | Reading meters | Comprehensive inspection | Deep cleaning | Comprehensive maintenance |
| Electrical | — | Inspecting panels | Inspecting wiring | Full testing |
| Plumbing | — | Checking valves | Checking the network | Pressure testing |
| Fire systems | — | — | Alarm testing | Comprehensive maintenance |
| Elevators | — | Periodic maintenance | — | Certified comprehensive inspection |
The Relationship Between the Two: The Ideal Balance
Well-managed facilities don't eliminate emergency maintenance entirely — that's impossible — but they maintain a healthy ratio:
- The ideal ratio: 70–80% preventive maintenance, 20–30% corrective and emergency
- Unmanaged facilities: Emergency maintenance may reach 60–70% of total maintenance
- The warning sign: If the emergency report rate exceeds 40%, that means a weakness in the preventive program
💡 Measuring your program's success: Compare the number of emergency reports this year to last year. A 15–20% annual decline with a good preventive program means you're on the right track.
Preventive Maintenance in Contracts: What Do You Ask For?
When contracting a maintenance company, make sure the preventive program includes:
- A clear list of the systems covered by preventive maintenance
- A detailed schedule for each system (monthly/quarterly/annual)
- Checklists showing what is done on each visit
- Documenting each visit with a brief report
- Advance notice to the client before each visit
- A monthly report showing the program's completion rate
Conclusion
The choice between preventive and emergency maintenance is not between two competing options — it's between two different approaches to risk management. A facility that invests in prevention pays smaller, predictable amounts and lives with fewer faults and less downtime. A facility that waits for faults pays more, suddenly, and suffers higher operational pressure.
Frequently Asked Questions
Yes, even a small office benefits from a simplified preventive maintenance schedule. The size of the program is proportional to the size of the facility and the complexity of its systems.
Calculate the cost of the last 3–5 major emergency faults (repair + downtime + lost productivity) and compare it to the cost of an annual preventive program. The numbers usually speak for themselves.
Preventive maintenance is carried out on fixed schedules, while predictive maintenance relies on actual data (temperature, vibration, electricity consumption) to anticipate a fault before it occurs. Predictive is more accurate but requires advanced technology.