Maintenance Planning

What Is Maintenance Planning?

Maintenance planning is the upstream work that makes every maintenance job more efficient. Before a technician ever picks up a tool, a planner defines the scope of the job, identifies the correct procedure, confirms parts and materials are on hand, and packages everything into a work order that can be executed without delay.

The discipline sits within the broader maintenance management function and is most often paired with scheduling to form a complete planning-and-scheduling process. Without planning, even well-intentioned preventive maintenance programs break down because technicians arrive at jobs without the right information, parts, or permits.

Why Maintenance Planning Matters

The cost of poor planning shows up in wrench time. Wrench time measures the percentage of a technician's shift spent performing direct maintenance work. In poorly planned environments, that number often falls below 25 to 30%. The rest is spent searching for parts, waiting for permits, re-reading procedures, or traveling back to the storeroom.

When planning is mature, wrench time routinely reaches 50% or higher. That improvement happens without hiring additional headcount: the same team simply spends more time working and less time preparing.

Beyond labor efficiency, maintenance planning reduces unplanned downtime by ensuring that known maintenance needs are addressed before they become failures. It also supports maintenance budget accuracy, since planned jobs have predictable material and labor costs while reactive jobs do not.

Maintenance Planning vs. Maintenance Scheduling

These two functions are closely related but serve distinct purposes. Conflating them is one of the most common mistakes in maintenance operations.

A common best practice is to keep the planner and scheduler as separate roles. The planner focuses exclusively on building quality work orders; the scheduler focuses on fitting those orders into available crew time and coordinating with operations for access windows.

The Maintenance Planning Process

While every organization adapts the process to its own context, most effective maintenance planning programs follow a consistent sequence of steps.

1. Identify the Work

Work enters the planning queue as a work order or work request. Sources include preventive maintenance triggers, operator-reported defects, inspection findings, and condition monitoring alerts. The planner reviews each request to determine whether it is a valid job and, if so, assigns it a priority.

2. Scope the Job

The planner visits the asset (or reviews its records) to understand the full scope of the work. This includes identifying access requirements, isolation points, safety permits, special tools, and the sequence of tasks. For complex jobs, the planner may write a step-by-step procedure or reference the original equipment manufacturer (OEM) documentation.

3. Identify Parts and Materials

Every job should leave the planning stage with a confirmed bill of materials. The planner checks the storeroom or inventory management system for part availability. If parts are not in stock, a purchase request is raised with enough lead time to avoid delaying the job.

4. Estimate Labor and Duration

The planner estimates how many technicians the job requires and how long it should take. These estimates feed directly into scheduling and are refined over time using actual job completion data from the CMMS.

5. Build the Work Order Package

The final deliverable is a complete work order package: task list, estimated hours, required parts, safety notes, permits, drawings, and any relevant maintenance history. When this package is handed to the scheduler, the job should be executable without additional preparation.

6. Review the Backlog

Planners actively manage the maintenance backlog: the queue of planned but not yet scheduled work. Keeping the backlog at a healthy size (typically two to four weeks of available crew capacity) gives schedulers flexibility without allowing work to age and deteriorate into emergencies.

Key Inputs and Outputs

Good planning depends on the quality of the data going into the process.

Common Maintenance Planning Tools

CMMS

A CMMS (Computerized Maintenance Management System) is the foundation of any structured planning program. It stores asset records, work order history, parts inventory, and PM schedules in a single system. Planners use the CMMS to create work orders, check parts availability, track backlog, and analyze job history to improve future estimates.

Work Orders

Work orders are the formal record of each maintenance job. A well-structured work order includes the asset ID, failure description, task list, required parts, labor estimate, safety notes, and completion fields. Over time, completed work orders become the asset history that planners rely on for future planning.

Asset History and Failure Records

Every time a job is completed, the data feeds back into the asset record. Planners use this history to anticipate recurring failures, adjust PM frequencies, and build more accurate job estimates. Assets with no history are harder to plan for; this is why recording completed work accurately in the CMMS is as important as the planning itself.

Standard Job Procedures

For high-frequency or complex tasks, planners develop standard job procedures: pre-written task lists with parts, tools, and steps documented. Once a procedure exists, planning time for that job drops significantly because the planner is not starting from scratch each time.

How to Measure Maintenance Planning Effectiveness

The following maintenance KPIs directly reflect planning quality.

These metrics should be reviewed weekly by the planning and scheduling team and monthly by the maintenance manager. Deterioration in any one metric is usually a leading indicator of deterioration in others.

Common Barriers to Effective Maintenance Planning

Understanding where planning programs fail helps teams build more durable processes.

Incomplete asset records: If the CMMS does not have up-to-date asset information, parts lists, or failure history, planners spend time hunting for data rather than preparing jobs.

Planners pulled into reactive work: In organizations where planning and execution are not separated, planners often abandon backlog work to fight fires. This erodes the planned work percentage and compounds future reactive demand.

Storeroom gaps: Planning a job and then discovering the required part is not in stock forces a delay. Planner effectiveness depends on inventory management discipline, including accurate on-hand counts and minimum stock levels for critical spares.

No standard job procedures: When every job is planned from scratch, planning capacity is consumed by routine work instead of complex or novel tasks. Building a library of standard procedures is one of the highest-leverage investments a planning function can make.

The Bottom Line

Maintenance planning is the process that converts maintenance demand into executable work. When done well, it increases technician productivity, reduces unplanned downtime, and makes maintenance costs more predictable. The investment in planning capacity more than pays for itself through reduced reactive work and faster, higher-quality repairs.

Organizations that treat planning and scheduling as distinct, protected functions consistently outperform those that treat maintenance as purely reactive. A CMMS with strong asset history, paired with a dedicated planner role, provides the infrastructure needed to sustain those gains at scale.