What is an asset register?
An asset register is the record of the plant and equipment in a building — what it is, where it is, its details and its maintenance history. Everything in a maintenance regime hangs off it.
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<img src="https://facilityoptix.co.uk/glossary/asset-register/diagram.svg" alt="asset register — diagram from FacilityOptix" width="880" height="620" loading="lazy">
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<a href="https://facilityoptix.co.uk/glossary/asset-register">What is an asset register?</a> — diagram by
<a href="https://facilityoptix.co.uk">FacilityOptix</a>
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</figure>It is the foundation and the most commonly neglected document. A PPM schedule can only be right if the register is right, so an inaccurate register produces an inaccurate regime no matter how well the scheduling is done.
Location and identification matter as much as the list itself. An engineer who cannot find the asset they were sent to service is the practical failure mode, and it comes from registers assembled from drawings rather than from walking the building.
It decays continuously. Assets are replaced, removed and added, and a register that is not updated at the point of change diverges from the building at a rate nobody notices until an audit.
In practice
A handover register listing 'AHU x 4' for an entire building.
Four air handling units exist. Where they are, what serves what, their make, model and age are all somewhere else or nowhere.
A register without locations and identifiers cannot drive a schedule or a work order, which means it is an inventory rather than a register.
The first job on taking over an estate is walking it with the register in hand, and it always takes longer than anybody plans.
What goes wrong in practice
- Built from design drawings rather than a physical survey, so it describes the intended building.
- Assets replaced without the register updated, leaving schedules pointed at equipment that is gone.
- No unique identification on site, so records cannot be reliably matched to physical plant.
- Held separately from the maintenance history, which halves the value of both.