If you're a developer who's been quoted a BIM coordination fee and your instinct is that it's an added cost you could avoid, this is worth reading before you make that call - because skipping BIM doesn't actually make the coordination problems it would have caught disappear. It just moves the cost of discovering them from the design phase, where fixes are cheap and fast, to the construction site, where they are neither.
This is the argument that should genuinely be made to a cost-conscious client resisting a BIM fee: not that BIM is a nice-to-have quality investment layered on top of the budget, but that its absence has a real, quantifiable rework cost that shows up later in that exact same budget regardless of whether the client chooses to see it coming.
Where the Avoided Cost Actually Goes When BIM Is Skipped
| Coordination approach | Typical rework cost (% of contract value) | Where the cost shows up |
|---|---|---|
| No BIM (2D drawings only) | 5% to 12% | Site-discovered clashes, quantity errors, redone work |
| BIM coordination (LOD 300+, clash detection applied) | 1.5% to 4% | Residual site conditions and late design changes |
MEP clashes: the clearest and most commonly cited example
When a duct run and a structural beam occupy the same physical space, that conflict exists in the design regardless of whether anyone checks for it before construction. On a 2D-drawing-only project, that clash typically isn't discovered until an installer is physically on site trying to route the ductwork and finds the beam in the way. At that point, the fix isn't a quick model adjustment - it's often demolition of already-installed work, re-fabrication of the duct section, a delay while the correction happens, and in more serious cases, a genuine dispute about who's responsible for the cost, since the architect, the structural engineer and the MEP contractor may each have reasonable grounds to argue it wasn't specifically their error. A BIM-coordinated project catches this same clash during a clash detection review weeks or months before construction, where the fix is a model adjustment that costs a fraction of the on-site correction.
Quantity and material ordering errors: the less visible cost category
A cost category that gets far less attention than clash-driven rework, but is genuinely significant, is quantity error from manual 2D takeoff. When quantities are measured manually off drawings rather than extracted from a coordinated model, small measurement errors compound across a large project - showing up as material wastage from over-ordering, or as expedited, premium-priced re-procurement when under-ordering is discovered mid-construction. Neither of these costs gets neatly attributed back to "the decision to skip BIM" in a typical project post-mortem, but they trace directly back to it.
Communication-driven errors: the hardest cost to quantify, but genuinely real
A subcontractor reading a 2D drawing detail that's ambiguous - a connection that could reasonably be interpreted two different ways, a dimension that's unclear at the scale the drawing was printed - is a routine source of on-site error that a coordinated 3D model, viewed in context with everything around it, would have resolved unambiguously. These errors are diffuse and hard to trace to a single root cause after the fact, which is exactly why they rarely make it into the formal cost argument for BIM, even though anyone who's run a site for any length of time recognises the pattern immediately.
A Scenario Worth Walking Through
Picture a mid-size commercial developer weighing a BIM coordination fee on a project with meaningful MEP density - a building with a basement parking level, retail on the ground floors, and office space above, each with genuinely different and interacting MEP requirements. The developer's instinct, understandably, is to look at the coordination fee as a line item to negotiate down or cut. What rarely gets modelled explicitly in that negotiation is the counterfactual: on a comparable project run without BIM coordination, the same developer's own site team would likely discover several MEP clashes during construction, each one costing a multiple of what catching it in a coordinated model would have cost, plus the schedule delay while the fix happens, plus the friction of sorting out which consultant or contractor bears the cost. Laid out this way, the coordination fee isn't really competing against "no cost" - it's competing against a different, larger, and less predictable cost that shows up later in the same project.
Where the Case for BIM Is Genuinely Weaker
It's worth being fair about the other side of this. On a genuinely simple, single-discipline, low-rise project - a small standalone building with minimal MEP complexity and few coordination interfaces to manage - the rework risk BIM is meant to prevent is correspondingly small, and the coordination fee may not be proportionally justified. The mistake isn't skipping BIM on this kind of project; it's applying the same blanket reasoning to a genuinely complex multi-discipline building where the coordination stakes are entirely different. The decision should track actual project complexity, not just budget size or a general belief that "BIM is always worth it."