How BIM relates to safety and health
A BIM model can associate construction elements with materials, dimensions, sequences and documentation. For prevention, the useful question is which decision that information supports: modifying access, avoiding a hazardous task or planning how to remove a component.
HSE highlights the value of designers and contractors reviewing models before construction begins. The approach connects with Prevention through Design promoted by NIOSH: considering hazards while the conditions creating them can still be changed. It is not simply about presenting an attractive three-dimensional image.
Which risks can be analysed before construction
The review can focus on access for assembly and maintenance, manoeuvring space, interfaces between services, circulation areas and proximity between tasks. Including the time sequence makes it possible to study whether simultaneous activities create interference that does not appear on a static drawing.
Select relevant scenarios and review alternatives with people familiar with their execution. Detecting a geometric clash may flag a problem, but does not identify every hazard by itself. Chemical exposures, physical workload, work organisation or weather conditions may require additional information and methods.
How to record useful preventive information
Agree which risks will be included, where they can be consulted and how they will be updated. An entry should identify the element or area, affected phase, hazard, decision taken and remaining risks.
- Identify who prepares and validates the information.
- Link each observation to a specific project version.
- Distinguish pending, approved and implemented decisions.
- Retain the assumptions and documents needed to interpret the data.
Avoid filling the model with repeated generic warnings. The aim is to support decisions and communicate relevant risks to those who actually need to manage them.
Coordination, versions and work on site
A review loses value if a different solution is used on site without updating the information. Establish how changes will be communicated and how the correspondence between design and execution will be checked. Also define a straightforward way to consult the data when the authoring software is unavailable.
In Spain, Royal Decree 1627/1997 regulates construction safety and health responsibilities and documents. BIM can support their management, but does not remove the requirement for a safety and health study, plan or coordination where applicable. It must be clear who decides, who informs and who checks each change.
Handover for use and maintenance
The final information must serve those who will operate the building or facility. Particularly useful information includes the location of services, access routes, isolation points, elements requiring inspection and restrictions on future interventions. Delivering numerous files without a comprehensible structure can undermine that purpose.
Before closing the project, agree the scope, formats and responsibility for retaining the information. Check samples with the maintenance team: if they cannot locate an item or distinguish versions, the handover needs review. An outdated model can create a false sense of understanding.
Hypothetical example: replacing rooftop equipment
During a building project, the model is used to review the route needed to replace an air-conditioning unit. The team finds that the planned access requires removal of a guard and leaves little space for the maintenance manoeuvre.
Before construction, the location is modified and permanent access compatible with the task is examined. The decision, its conditions and residual risks are linked to the element. At handover, maintenance checks the actual route. The preventive benefit comes from changing and verifying the design, not from having the model alone.
