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Consulting, Technology

Heathrow Terminal 3 remodelling

Using Real 4D technology to link a model of Terminal 3 with a Smartsheet schedule, we were able to give Mace real-time visual monitoring of the planning and construction process


The Heathrow T3 construction programme was complex and difficult to not only visualise but also to keep track of to ensure there wasn’t any conflicts or restrictions throughout the terminal.

For Mace, their challenge was having a transparent, real-time view of 5 phases of work that were going to be undertaken across Heathrow Terminal 3. Mace wanted to understand what works were being complete at what time, and the effects of those works on other contractors alongside having the ability to test different scenarios in a virtual environment without costly and high-risk consequences.


SPi indirectly brought the world of gaming into a construction environment. By taking the supplied CAD model of T3 and put it into a games engine environment we were able to create a Digital Twin of the terminal.

We then linked this to the Smartsheet programme schedule via an API and SQL server to create a real-time model that provided Mace a virtual environment to rehearse construction operations, view the impact of changes and give a visual representation of works, in a risk-free environment.



By using modelling and simulation to provide a Digital Twin environment, Mace were able to save budget and mitigate risks across the entire programme.

Before construction even started, they were able to identify potential clashes, optimise the programme and keep the workforce and stakeholders informed and engaged by giving them the opportunity to interact and view the entire Terminal and focus on areas of interest. All of this contributed to less disruption and delay to the programme and supported in delivery on time and within budget.

Heathrow Terminal 3 remodelling
  • Using SPi’s state-of-the-art technology we can spot clashes before they happen, making the project safer and more efficient. This delivers benefits for passengers, taxpayers and our orange army
    Project Manager, Liverpool Limestreet remodelling - Network Rail
  • SPi’s virtual reality signal sighting ensured fast and fluid real time positioning allowing many options to be viewed, saving our committee significant time and site visit costs
    Midland Main Line Project - Network Rail
  • SPi delivered high quality service, keeping in communication with our requirements throughout, and going beyond the call of duty when needed
    Signalling Engineer - Mott MacDonald
  • The ability to streamline the exchange of information and automate reporting has improved my relationship with our contractors which in turn has reduced admin and uncertainty
    Project Manager – Network Rail