8/04/2026
The biggest cost overrun in a project is not steel or concrete. It’s assuming that the information is correct.
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In complex projects – throughout the entire lifecycle: design, tender, and execution – there’s an uncomfortable truth:
BIM models, IFC files, drawings, specifications, and shop details are not always consistent with each other.
And worse: these inconsistencies are rarely caught by standard checks.
This is not a minor issue.
It’s a latent risk that impacts cost, schedule, and quality.
What does this look like in practice?
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Unvalidated IFC models: non-constructible geometries, missing parameters, incorrect classifications that break automated quantity takeoffs.
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Poor rebar detailing: bar lengths incompatible with cover requirements, poorly defined laps, or lack of anchorage space in beams and columns.
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Quantity duplications across disciplines: the same earthworks counted by civil and MEP, or rebar counted twice.
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Missing information that forces contractors into unvalidated assumptions.
None of these appear as an error in the model or drawings.
They appear as cost overruns during construction.
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Here’s the critical point:
These inconsistencies are rarely discovered on site in time – because no one looked for them earlier.
Not in the IFC model, not in the shop drawings, not in the cost tracking.
At Deltana Engineering, we’ve seen how comprehensive technical verification prevents:
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Unforeseen increases in actual quantities
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Redesigns and site stoppages due to impossible rebar layouts
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Loss of cost control during execution
That’s why our approach is not just about measuring or auditing at tender stage.
It’s a continuous technical partnership that includes:
✅ IFC model verification (geometric integrity, parameters, classifications)
✅ Rebar detailing review (constructibility, laps, cover, anchorage)
✅ Continuous cost control (deviation tracking, S-curves, early warnings)
In demanding projects, the difference is not how much you measure…
but what you detect before construction – and how you control it throughout the project.
As an independent technical partner, we bring a fresh, critical eye where others assume.
From the IFC model to the last reinforcing bar. From tender to final certification.
#Engineering #Construction #BIM #IFC #RebarDetailing #CostControl #ProjectManagement #IndependentEngineer