Modified factory machinery: explain what changed
- Reading time
- 3 minutes
- Last reviewed
On this page
“Rebuilt” can mean anything from replacement parts to a different control system and production function. When selling modified machinery, explain what changed.
Start with a chronology linked to the machine's identity. Record the work, who performed it and which documents support it. That gives a competent specialist a basis for assessing the present machine and the proposed supply.
A fresh coat of paint, a contractor invoice or the original manufacturer's plate does not explain the whole change history.
Separate the description from the assessment
HSE's guidance on refurbished and modified machinery in Great Britain distinguishes refurbishment from changes that may create new obligations. Like-for-like work does not automatically require re-marking. More substantial changes to design, function or safety require assessment and may bring the machinery within further conformity requirements.
The outcome depends on the actual changes. Do not decide it from the word “refurbished” on an invoice.
The seller can assemble the history and disclose known facts. A competent specialist should resolve technical and supply questions that the records leave open.
Build the chronology
| Date or period | Change recorded | Evidence reference | Question for review |
|---|---|---|---|
| Original supply | Machine identity and original configuration | Original order, instructions and drawings | Do these records match the base machine? |
| Repair or replacement | Identified component and reason for work | Contractor report and parts records | Was the replacement equivalent or did its function change? |
| Controls work | Controller, operating mode or safety-related change | Revised drawings and assessment records | What was assessed after the change? |
| Process alteration | Added equipment or different intended task | Project file and integrator records | Did the change affect the wider assembly? |
| Present sale | Current configuration and known faults | Recent findings and asset photographs | What remains unresolved before supply? |
The entries are prompts, not classifications. “Replacement controller” is a fact to investigate, not proof that the work was minor or substantial.
If the date is uncertain, record the evidence range rather than inventing a year. If the contractor is unknown, say so and identify the records still being sought.
Look beyond the individual component
A change can affect equipment around it. A new handling unit may alter how a machine is fed. A different control arrangement may affect the complete line.
For a palletising cell, keep the robot, tooling, conveyors and cell records together. For an injection moulding machine, distinguish work on the machine from changes to associated equipment.
HSE's cited guidance specifically addresses assemblies of machines as well as individual units. The specialist needs to understand which parts of the installation were affected, rather than looking only at the invoice for the new component.
Do not assume that unchanged components settle the assessment of the changed system.
Preserve the old and revised documents
Keep original records alongside later revisions, with their status clearly marked. The machinery handover pack guide provides a register for this.
Ask for assessment reports, commissioning records and revised instructions where relevant to the work. An invoice can show that work was billed; it may not explain its technical scope or result.
For a power press, retain the relevant inspection records as a distinct part of the file. Do not treat an inspection date as an automatic answer to every modification question.
Where records conflict with the fitted equipment, commission an assessment of the discrepancy. Do not amend the description to whichever version appears easier to sell.
Let the review inform the sale basis
A clear change history can make a specialist review more focused. Missing evidence may require further enquiry or affect the proposed timetable and terms.
Describe completed work precisely and disclose unresolved findings. Avoid “upgraded to current standards” unless an applicable assessment supports that statement and its scope is clear.
Contact UK Auction Group with the chronology, present inventory and specialist findings. The sale can then be discussed on the basis of the actual modified machine, with outstanding questions visible before marketing commitments are made.
Return to the manufacturing and process equipment hub.
Sources
This guide gives general information. Equipment-specific, legal, tax and safety decisions may need a qualified adviser or competent specialist. The guides do not promise sale prices, fees or results.