IT & DIGITAL | 4D PLANNING


4D planning allows ‘what-if’ scenarios to be simulated, to understand knock-on effects of changes or disruption to the construction plan and optimise emergency escape routes as the project progresses. Source:


Aegis Services Ltd


up-to-date status information, the project manager is in a position to offer a greater strategic value in their role, by spotting discrepancies as they emerge and proactively taking remedial action, rather than retrospectively trying to learn from past mistakes.


Scenario simulation 4D planning allows clients to simulate ‘what-if’ scenarios, to understand knock-on effects of changes or disruption to the plan and optimise emergency escape routes as the project progresses. Scenario simulation requires the power of artificial intelligence (AI) to analyse multiple data sources and, for some applications, the capabilities for creating immersive VR environments and communicating real-time project status also. Scenarios may be created for delays, design changes, delivery issues, adverse weather, levels of daylight, to learn about the risks these bring, and what remedial action is needed to minimise them. An example of the power of 4D planning tools in ‘what


if’ scenario modelling may be derived from optimising an emergency escape route for temporary works. Dynamic, immersive AI-powered 4D planning tools are key to maintaining optimised emergency escape routes through the lifecycle of the project. An updated 4D model tells users where the current point of work is located. In the model, the planner is able to place people at those work faces and trigger a scenario for them to escape to fire assembly points. AI will then predict the safest route from the available openings. That optimal path may then be extracted for use in design tools, and the planner can then think about reconfiguring the site to optimise safety. The planner may also tweak the simulation, by inserting obstacles such as barriers, for a more realistic assessment of the escape route.


Facilitating communication A 4D plan is an effective communications tool for all stakeholders. Site workers can understand their responsibilities more easily and avoid misinterpretations or duplicated effort. With its ability to communicate various impacts, scopes and their status, 4D planning can


20 | June 2026 | www.neimagazine.com


be more effective at getting local communities, investors and regulatory bodies onside, which may speed up approvals or financing decisions.


A single repository for cost and compliance When connected to the cost data, an updatable 4D model can also control budgets through the life of the project. Model changes or programme delays automatically update cost plans, highlight changes in resource profiles, and trigger procurement alerts. This allows commercial teams to see the impact of scope and sequence changes in real time. 4D planning, with integrated cost data, can therefore


provide a living forecast of what has happened, what is likely to happen, and how much it will cost – increasing visibility, reducing surprises, and improving financial control. Additionally, advanced 4D planning solutions can


significantly ease compliance with changing regulations by enabling automated verification of digital models against regulatory requirements. This assists with faster, efficient and reliable compliance processes. An advanced 4D plan, integrated with documentation


and cost data, can also provide the basis for a digital twin. As the building’s ‘live brain’ for its operational life, the digital twin continuously processes information to optimise performance, reduce maintenance costs and emissions, and flag issues before they escalate.


The basis for safe, efficient construction To deliver best value through the project lifetime, digital planning must be seen as a dynamic, interoperable tool that immediately reflects schedule changes in the visual simulation and that can be shared with multiple stakeholders. Overall, 4D planning tools provide the basis for efficient, safe and smooth scheduling. They also empower teams and project managers with the foresight to avoid problems, and the ability to forecast schedules and timescales accurately. Transparency and efficiency will be crucial to win support of taxpayers, communities and investors as nuclear energy’s contribution to net zero and energy resilience is debated with intensity. Efficient, safe construction is key to winning that argument, and 4D planning is an important contribution to that aim. ■


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