How to build a PPM schedule: a step-by-step guide

What is a PPM schedule?

A PPM schedule sets out which maintenance tasks happen, on which assets, and when. It covers routine work done before anything breaks: changing filters, checking belts, testing fire alarms, cleaning coils and so on.

The aim is simple. Planned work is usually cheaper and less disruptive than emergency repairs. A good schedule catches small problems early, keeps equipment running as it should, and gives the team a predictable workload.

A PPM schedule is not the same as a list of manufacturer recommendations. It is a working plan for your site, built around your assets, your people and your building’s use.

Step 1: Build a complete asset register

You cannot schedule maintenance for equipment you have not recorded. Start with an asset register that lists every maintainable asset in the building.

For each asset, record at least:

• A unique ID and a clear name
• Location (site, building, floor, room)
• Asset type, make and model
• Install date, if known
• Current condition
• Any existing maintenance history

Most teams find gaps at this stage. Some assets are missing, some are recorded twice, and some records have no location. Fix these before moving on, because every later step depends on the register being right.

If you are moving to a new CAFM system, this is also the data you will need at go live. See what data you need before go live for a fuller list.

Step 2: Rank assets by how critical they are

Not every asset needs the same attention. A chiller serving a whole tower matters more than a single exhaust fan in a store room.

A simple way to rank assets is to ask three questions:

1. What happens if this asset fails? (Safety risk, disruption, or minor inconvenience)
2. How quickly does it need to be fixed?
3. Is there a backup?

Group your assets into three levels, such as high, medium and low. High-criticality assets get the most detailed tasks and the closest monitoring. Low-criticality assets may only need a basic check, or you may choose to run them until they fail and replace them.

Step 3: Define the task for each asset type

For each type of asset, write down what the servicing visit involves. Keep it as a short checklist a technician can follow on site.

For example, a PPM task for an air handling unit might include:

• Inspect and replace filters
• Check fan belts for wear and tension
• Clean the coils
• Check the drain pan and clear blockages
• Record any faults found

Write tasks once per asset type, then apply them to every matching asset. This keeps the work consistent and makes the schedule much easier to manage.

Step 4: Set how often each task happens

This is the step most teams find hardest. There are three common ways to set an interval.

Start with the manufacturer’s guidance. Then check for any legal, insurance or contract requirements that apply to your site, especially for fire and life safety systems. Where those set a minimum frequency, that minimum comes first.

After that, adjust based on your own conditions. Equipment in a dusty or hot environment, or equipment that runs around the clock, often needs servicing more often than the manual suggests. Equipment that runs lightly may need it less often.

Over time, your own maintenance history is the best guide. If an asset keeps failing between visits, the interval is too long. If technicians keep finding nothing to fix, it may be too short. Some CAFM systems can now suggest intervals from this kind of data. See how suggested PPM intervals work for one example.

Step 5: Spread the work across the year

Once every task has an interval, put them on a calendar. The first draft usually shows problems: some weeks are overloaded while others are nearly empty.

Smooth this out by:

• Moving flexible tasks into quieter weeks
• Staggering tasks for similar assets instead of doing them all at once
• Planning major work around the building’s use, such as outside business hours or during low-occupancy periods
• Timing seasonal work sensibly, for example servicing cooling equipment before the hottest months

Leave some spare capacity in each week. Reactive jobs will still come in, and a schedule with no room for them will slip.

Step 6: Assign who does the work

For each task, decide who is responsible. Some tasks suit in-house technicians. Others, such as lift servicing or specialist fire system testing, are usually done by contractors.

Make sure each task has:

• A named team or contractor
• The skills or certifications needed
• An estimate of how long it takes
• Any permits or access arrangements, such as a permit to work for high-risk jobs

This helps you check that the schedule is realistic for the people you actually have.

Step 7: Track completion and review the schedule

A schedule only helps if the work gets done and recorded. Track at least two things:

• PPM completion rate: the share of scheduled tasks finished on time
• Planned vs reactive ratio: how much of your maintenance work was planned compared with breakdowns

If completion is low, the schedule may be too heavy for your team. If reactive work stays high even when PPM is done, the tasks or intervals may be wrong for some assets.

Review the schedule regularly, at least once a year, and after any big change such as new equipment or a change in how the building is used.

If reactive work is taking over, our guide on planned vs reactive maintenance explains how to shift the balance.

Common mistakes to avoid

• Copying the manual word for word. Manufacturer intervals are a starting point, not a final answer for your site.
• Scheduling everything at the same frequency. This wastes effort on low-risk assets and can leave critical ones under-maintained.
• Ignoring the data. If failures keep happening between visits, the schedule needs to change.
• Planning without capacity. A schedule that needs more hours than your team has will fall behind within weeks.
• Keeping it in a spreadsheet for too long. Spreadsheets work for small sites, but they become hard to manage as assets, sites and technicians grow.

Where software helps

For a single small building, a spreadsheet and a shared calendar can be enough. Once you manage hundreds of assets or several sites, most teams move to CAFM or CMMS software.

These systems generate work orders automatically when PPM is due, send them to technicians, and record what was done. They also keep the maintenance history you need to review and improve intervals. Some add tools that go further, such as predictive maintenance and anomaly detection, which flags unusual asset behaviour between visits.

If you are new to these tools, what is CAFM software explains the basics.

Frequently asked questions

How often should PPM be done?

It depends on the asset. Start with the manufacturer’s guidance and any legal or contract minimums, then adjust using your site conditions and maintenance history. Critical assets usually need more frequent servicing than low-risk ones.

What is the difference between PPM and preventive maintenance?

They mean almost the same thing. Preventive maintenance is the general practice of servicing equipment before it fails. PPM refers to that work when it is planned and scheduled in advance.

What should a PPM schedule include?

At minimum: the asset, the task, how often it happens, the next due date, and who is responsible. Most schedules also record the time needed, any permits required and the completion history.

Is PPM better than reactive maintenance?

For most important assets, yes, because planned work is easier to manage and usually less disruptive than emergency repairs. Some low-value assets are cheaper to run until they fail and then replace. A good plan uses both, on purpose.

Do I need software to manage a PPM schedule?

Not for a small site. As assets and sites grow, software makes it much easier to generate jobs on time, track completion and keep the history needed to improve the schedule.

For more maintenance terms explained in plain English, see our FM glossary.