Managing maintenance contractors means selecting, briefing, supervising and reviewing the outside firms that carry out maintenance for you, usually for specialist work, inspections or extra hands during a shutdown. You can outsource the work, but not the responsibility for your plant: you decide what is done, on what terms and what happens with the results. Good contractor management therefore goes beyond a contract and a purchase order. It covers a clear scope, safe work on your site and following up everything the contractor reports, until every finding has been dealt with.
Why companies outsource maintenance
Almost every maintenance department outsources part of its work. The reasons vary from job to job:
- Specialist skills. Work you do too rarely to stay good at, or that needs special equipment or certification: a turbine overhaul, refractory lining in a boiler, vibration analysis or non-destructive testing.
- Peak capacity. During a shutdown, more work has to be done in a few weeks than your own crew manages in months.
- Inspections. Here an independent, expert view is the whole point. Which inspections are mandatory is covered in statutory inspections.
- Warranty and service. During the warranty period, the supplier often specifies who carries out the maintenance.
- Labour shortages. Experienced technicians are scarce; sometimes outsourcing is the only way to get the work done.
What to keep in-house
Whatever you outsource, control stays with you. That covers knowing your plant and its risks, setting priorities, releasing work and making the plant safe, accepting or rejecting completed work, assessing findings and keeping the maintenance history of each asset. Organisations that outsource this as well usually find out when the contractor leaves: nobody knows any more why things were set up the way they are.
Contract types: time and materials, fixed price, framework or performance-based
How you pay a contractor determines who carries which risk. Four forms are common in maintenance:
| Contract type | You pay for | Suits | Watch out for |
|---|---|---|---|
| Time and materials | Hours and materials | Breakdowns, unclear scope | You carry the risk of overruns |
| Fixed price | A defined result | Well-defined work, such as an overhaul package | Every change becomes a variation |
| Framework with SLA | Availability, plus work at agreed rates | Recurring work, call-out service | Make the agreements measurable |
| Performance-based | An outcome, such as availability | Long-term relationships with reliable data | Agree the baseline and measurement method first |
In practice you combine them. A waste-to-energy plant might have a framework contract for breakdowns and minor work, award the shutdown work package at a fixed price and handle work that only comes to light during the shutdown on a time-and-materials basis.
A service level agreement (SLA) sets out what you can expect: response time, repair time, availability and the deadline for the report. An SLA is only as good as the records behind it. Agree who logs the times and where, or every review ends in an argument about whose figures are right. For the structure of the contract itself, the European standard EN 13269 gives guidance on the topics a maintenance contract can cover.
A good work package: scope, acceptance and reporting requirements
A contractor delivers what you ask for, and no more. A job that has been properly prepared includes:
- Scope. Which assets, with their code or tag, which tasks, and what is explicitly excluded.
- Specifications. Standards, tolerances, materials, tightening torques, and measurement and test methods.
- Acceptance criteria. When is the work finished? For example: readings within limits, a successful test run, open items recorded with a deadline. On larger jobs, agree hold points: moments when you inspect before the contractor may continue.
- Site conditions. Work window, downtime, access, required permits and a single point of contact.
- Reporting requirements. This is the part most often missing, and the follow-up depends on it.
Agree the report format in advance
Many reports are running text in a PDF, with the findings buried in a paragraph or a photo caption. So ask for a fixed set of data for each finding: a unique number, the asset or measurement point with the same code as in your register, what was found with a photo and a reading, the severity, the recommendation and the deadline. Ask for a list of findings in fixed columns alongside the PDF, and agree within how many working days of completion the report must arrive.
For a boiler inspection at a waste-to-energy plant, that means, for example, the wall thickness at each fixed measurement point, using the agreed point numbering, with points below the minimum allowable thickness flagged separately. You can then set the readings next to last year's, instead of comparing two reports page by page.
Managing maintenance contractors safely on your site
Contractors know your plant less well than your own staff, and they often work at the riskiest moments: during shutdowns, on opened-up equipment, under time pressure. The UK Health and Safety Executive's brief guide Using contractors is clear that client and contractor both have duties, from defining the job through to supervising it. In practice it comes down to five things:
- Pre-qualification. In the Netherlands, many clients require VCA certification, a safety, health and environment certification scheme for contractors. The VCA scheme (in Dutch) has three levels: one-star VCA for companies without subcontractors, two-star VCA for companies that use subcontractors, and VCA Petrochemie. Whether you require it is up to you as the client. For individual workers there are personal diplomas, such as Basisveiligheid VCA and VOL-VCA for operational supervisors.
- Site induction. Everyone who works on your site must know the local hazards, rules, alarms and escape routes. At a waste-to-energy plant that means hot ash, carbon monoxide and confined spaces in the boiler; at a distribution centre, moving vehicles and automated sorting systems.
- Permit, LOTO and LMRA. As a rule, your side of the organisation issues the permit to work and the contractor applies for it. Making the plant safe is also done under your responsibility, with every member of the contractor's crew applying their own lock. The last-minute risk assessment (LMRA) is done by the people doing the work, at the workplace itself. How these layers fit together is explained in safe maintenance: LMRA, LOTO and permits to work.
- Cooperation between employers. In the Netherlands, Article 19 of the Working Conditions Act (in Dutch) requires different employers whose people work in the same company or establishment to cooperate effectively to comply with the Act. So record who arranges what, who supervises and how incidents and near misses are reported.
- Supervision. Appoint a point of contact for each job who accompanies the contractor, carries out spot checks and accepts the work.
How permits, work and assets can be linked is shown under safety.
Following up contractor reports until the work is done
After a shutdown there are dozens of reports: from the boiler inspector, the refractory specialist, the vibration analyst and the inspection body. They land in one person's inbox, often weeks after the work. The findings are scattered across running text, photo captions and appendices, and the severity the contractor assigns says nothing about the criticality of your asset. Everyone goes back to the day job, and a year later the same finding turns up in the next report. A report that has been read but not processed gives false comfort: the risk has been flagged, but nobody acts on it.
What helps is a fixed process in five steps:
- Log the report. Record it against the job, the asset and the contractor, with the date of the work. That way you can find it again and know which work it belongs to.
- Extract the findings. Put each finding on its own line: what, where (with the asset code), on which page, with the contractor's severity and recommendation. Read photo captions and appendices too.
- Assess. Judge every finding yourself: accept or reject it, and record a reason when you reject. Set your own severity and deadline; the criticality of the asset feeds into that.
- Choose the action. Every accepted finding gets a destination: a notification or work order, a link to work that is already planned, or a deliberate close-out without work, with a reason.
- Close out. Let the status of the finding follow the work: open, in progress, done. Close the finding only when the work is done, and tell the contractor what happened with their findings.
In the diagram below, a 42-page boiler inspection report yields nine findings: one critical, two high, four medium and two low. During assessment you reject one because it appears twice in the report. Of the eight accepted findings, five become a notification or work order, two are linked to work that was already planned, and one recommendation is deliberately closed without work, because the unit is being replaced next year.
Agree with your contractors which severity classes you use and what they mean. Then "high" means the same in every report, and you can compare reports from different firms. An example:
| Severity | Meaning | Example deadline |
|---|---|---|
| Critical | Immediate risk to safety or the plant | Before start-up or immediately |
| High | Defect that can get worse quickly | Within a few weeks |
| Medium | Defect that needs repair but is not urgent | At the next planned shutdown |
| Low | Recommendation or improvement | When convenient, or deliberately not |
Software can now do part of the work of reading reports. What that does and does not deliver is covered in AI in maintenance.
Spotting recurring findings
If you record findings per asset, you see what keeps coming back: the same crack in the same grate zone, the same advice about a leaking valve every year. A recurring finding calls for a root cause analysis rather than yet another repair. Look per contractor as well: which recommendations come back every year without anything being done, and which findings concern work the same contractor did earlier?
Checking that the job was done in full
Check the report against the work order before you approve the invoice. Which tasks does the report list as done, which as partly done, and which are not mentioned at all? And does it include work that was never ordered? That is a variation, and you want to assess it before it appears on the invoice.
Measuring and reviewing contractor performance
Judging a contractor on gut feeling leads to arguments. So measure a few things you can back up with your own records:
- On time. Completed within the agreed window; response time to breakdowns in line with the SLA.
- Quality. Rework, such as a failure of the same asset within, say, 30 days of the job, and rejections at handover.
- Reporting. Report within the agreed deadline, findings complete and with an asset code.
- Safety. Incidents, near misses and breaches of permit conditions.
- Cost. Variations as a percentage of the contract value, and budget against actual.
Review the figures with the contractor regularly, for example every quarter and after each shutdown, and agree on improvements. How to define metrics unambiguously is covered in maintenance KPIs.
Common mistakes when outsourcing maintenance
- Outsourcing the knowledge as well. Without in-house knowledge you cannot assess a quote, a report or a variation.
- A vague scope. Anything not in the work package becomes a variation, or does not get done.
- No reporting requirements. You get running text, and every finding takes searching.
- Reading reports without processing them. A finding without a notification, work order or recorded reason is a risk that nobody manages.
- Copying the contractor's severity blindly. The contractor assesses the component; you assess the whole plant.
- Leaving safety to the contractor. Site induction, permits and making the plant safe remain your business too.
- Approving invoices without a scope check. If nobody checks the report against the work order, you sometimes pay for work that was not done.
- Reviewing without figures. Then the most persuasive talker wins, not the firm that does the best work.
Frequently asked questions
What is contractor management in maintenance?
Contractor management is the selection, pre-qualification, direction and review of outside firms that carry out maintenance for you. It starts with choosing a contractor and agreeing the contract, runs through the work package, site induction and supervision on the shop floor, and only ends when the findings from the report have been dealt with and performance has been reviewed. The aim is for outside work to be as well controlled as work by your own crew.
Do maintenance contractors need VCA certification?
Not by law: VCA is a certification scheme, not a legal requirement. In the Netherlands the client decides whether a contractor must hold a VCA certificate, and many industrial clients make it an entry requirement. Health and safety law applies regardless: every employer must ensure safe working, and employers working in the same company must cooperate. A certificate says something about the contractor's safety management system, not about the hazards of your plant.
Who is responsible for a contractor's safety?
Both parties, each for their own part. The contractor remains responsible, as an employer, for the working conditions of its own people: instruction, equipment and the LMRA. You know your plant and the hazards of your site, so you arrange the site induction, the permit and making the plant safe. When you work in the same company, Dutch law (Article 19 of the Working Conditions Act) requires you to cooperate. Record the division of tasks in writing beforehand.
Is outsourcing maintenance cheaper than doing it yourself?
It depends on the type of work. Specialist jobs you rarely do and peak work during a shutdown are often cheaper to outsource than keeping your own people, knowledge and tools available. For frequent work and breakdowns on critical plant, response time and knowledge of the installation carry more weight. So do not compare hourly rates alone; include the time it takes to direct and supervise contractors and to process their reports.
What is the difference between a service report and an inspection report?
A service report describes work carried out: which tasks were done, which parts were replaced and what the technician noticed along the way. An inspection report describes the condition of the plant: measurements, observations and findings with a verdict, without anything necessarily having been repaired. A statutory examination or certification report is an inspection report with a formal verdict against a standard or legal requirement. All three can contain findings you need to follow up.