A planned preventative maintenance (PPM) calendar is the operational document that determines when each piece of equipment in a building receives attention, what type of attention it receives, and who is responsible for delivering it. Getting this document right is one of the highest-leverage actions a facilities manager can take.
Step 1: Complete Asset Register
You cannot plan maintenance for assets you do not know you have. Start with a complete, accurate asset register — every mechanical and electrical asset in the building, with make, model, serial number, installation date, warranted service intervals and criticality rating. If this does not exist, it needs to be created as the first step in any maintenance programme. Prysm Edge can conduct a full building asset survey as a standalone engagement.
Step 2: Define Service Intervals by Asset Type
Service intervals should be determined by manufacturer recommendations, statutory requirements (certain systems have legally mandated inspection frequencies) and criticality. A critical cooling system serving a data centre or medical facility may require monthly inspection. A secondary split-AC unit in a storeroom may require annual service. Every asset should have a documented, justified interval.
Step 3: Sequence to Avoid Conflicts
A naive PPM calendar clusters everything at the start of each quarter, overwhelming the maintenance team and creating periods of zero activity. A well-sequenced calendar distributes workload evenly, avoids simultaneous works on interdependent systems, and respects the operational calendar of the building — not scheduling disruptive works during the client’s busiest trading periods.
Step 4: Build in Seasonal Preparation
Every building has a seasonal maintenance rhythm. Cooling systems should be fully serviced before the summer peak load period. Heating systems should be serviced and pressure-tested before the winter cooling season begins. Fire and life safety systems should be tested and certified before any period of peak occupancy. Build these seasonal checkpoints explicitly into the calendar.
Step 5: Create Accountability and Review Cadence
A PPM calendar that exists as a spreadsheet but is never reviewed is not a maintenance programme — it is a document. Assign clear ownership for each scheduled activity, implement a simple reporting mechanism (a monthly one-page completion report is sufficient), and conduct a quarterly review against the calendar to identify slippage and adjust the forward schedule.
