Deciding late is expensive: digital twins and decision time

Almost everyone assumes a project runs late because construction is slow. In most cases the delay started much earlier, in a meeting where nothing could be decided.

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The size of the problem

McKinsey measured it: large construction projects take about 20% longer than scheduled and run up to 80% over budget. In a review of more than 300 projects with contracts above one billion dollars, cost overruns averaged around 80% and delays around 50%.

Those are megaproject figures, but the mechanism is identical in an eighty-unit tower.

Why committees don't decide

The scene repeats itself. The architect, the engineer, the site manager, procurement and the commercial lead are all there. Plans on the table. Each of them looks at the same sheet and sees something different.

Nobody actually disagrees, it's that nobody is looking at the same thing. So the decision gets pushed “pending review,” another render gets requested, another meeting gets scheduled. Two weeks later the topic comes back unchanged.

Autodesk and FMI surveyed more than 3,900 industry professionals and put a price on it. Bad data (incomplete, inaccessible, inconsistent or late) cost global construction roughly US$1.85 trillion in 2020. In rework alone, US$88.69 billion: 14% of all rework performed that year.

And most of it starts in design

The Construction Industry Institute analyzed nine industrial projects and found that deviations ending in rework, repair or replacement accounted for 12.4% of total installed project cost.

The most revealing figure is that design changes, errors and omissions explained 78% of the number of deviations and 79% of their cost, equal to 9.5% of total project cost. So the site crew rarely gets it wrong on its own. They arrive to build something that was never fully defined.

What a month of indecision costs

The cost of time never shows up in the minutes, but it gets paid:

• Financial. One more month of construction financing, trust fees and fixed project overhead.
• Commercial. A launch window that slides and lands in low season.
• Operational. Contractors and suppliers waiting, with quotes expiring and prices to renegotiate.
• Team. Skilled people spending hours re-explaining the same thing.

What changes with a model everyone can see

When the project is modeled in 3D and projected in the meeting, the conversation changes in kind. Nobody has to imagine anymore: you navigate to the point in question, look, and decide.

Dodge Data & Analytics found that 87% of BIM users report positive value, and the benefits they cite most are exactly those: fewer errors, less rework and greater cost predictability.

The model doesn't make the decision. It just removes the excuse to postpone it.

With Vista D360 we do precisely that: we turn plans, mockups and renders into a navigable model and review it in sessions with the leads from each area. What gets decided is recorded in minutes and on video, with traceability of what changed and why.

What a decision session with the model looks like

1. Before: the team lists the pending decisions, each with an owner, and loads the options to be compared into the model.
2. During: they navigate to each point, look at the options side by side and decide. If a piece of information is missing, someone is assigned to bring it by a set date, with the view saved so the discussion can pick up right there.
3. After: the decision goes into the minutes and the session video, the model is updated and contractors receive the new version.

The difference from a meeting over drawings is the starting point. Everyone looks at the same thing, from the same spot, and the discussion stops revolving around how to read a drawing.

Which decisions belong in the model

• Facade and materials: how they really look, at different times of day and from the street.
• Unit mix: which units go on each floor and how the view changes for each one.
• Amenities: size, equipment and circulation, before the budget is set.
• Finishes by unit type: the options offered to buyers and their effect on cost.
• Changes requested by buyers: what can be accepted without affecting construction.

How to tell whether it's working

Some signals can be measured from the first month: the days between a question coming up and a decision being made, the number of meetings each decision needs, the queries coming in from the site and the changes that appear after the design was approved. If those numbers go down, the model is doing its job.

Frequently asked questions

How late do large construction projects usually run?

According to McKinsey, large construction projects typically take about 20% longer than planned and can run up to 80% over budget.

How much does bad data cost the construction industry?

Autodesk and FMI estimated that incomplete, inconsistent or late data cost the global construction industry about US$1.85 trillion in 2020 and accounted for 14% of all rework that year.

What is a digital twin at the design stage?

It's a navigable 3D model of the project, built from the drawings, that the team walks through in meetings so everyone reviews and decides while looking at the same thing. It's most useful before construction, while changes are still cheap.

What is Vista D360?

It's the Inviewd service that turns drawings, physical models and renders into a navigable model and reviews it in live sessions with the leaders of each area. Decisions are recorded in minutes and on video, with a record of what changed and why.

Sources

McKinsey — Imagining construction’s digital future · Autodesk + FMI — Harnessing the Data Advantage in Construction · Construction Industry Institute — Costs of Quality Deviations