How BIM and Revit Coordination Reduces Construction Clashes

Construction clashes — where different building elements occupy the same physical space in a completed building — are one of the most preventable sources of cost and delay on a project. A mechanical duct running through a structural beam. An electrical conduit conflicting with a hydraulic pipe run. A sprinkler head positioned where a ceiling bulkhead was supposed to be.

These situations happen regularly on projects where the engineering disciplines work in isolation. They are identified on site, at the worst possible moment, after materials have been procured and trades are already mobilised. Resolving them typically involves redesign, rework, variations and delays — all of which carry real cost.

Building Information Modelling (BIM) and coordinated Revit modelling exist specifically to eliminate this problem. This article explains how the process works and what it means in practice for developers, architects and builders working with a multidiscipline engineering consultant in Sydney.

What is Building Information Modelling?

Building Information Modelling (BIM) is a process for creating and managing a digital representation of a building across its entire lifecycle. Rather than working from separate two-dimensional drawings produced by each consultant, BIM involves building a shared three-dimensional model that all disciplines contribute to and work from.

The model is not simply a visual representation. It is an intelligent dataset. Each element in the model carries information about what it is, what it is made of, how it connects to other elements, and how it performs. That information can be used for coordination, documentation, cost estimation, energy modelling, facilities management and more.

In the Australian construction industry, Revit — developed by Autodesk — is the dominant BIM authoring platform for engineering and architectural work. When an engineering consultant refers to working in Revit, they are describing the software environment where the BIM model is built and maintained.

What is Revit coordination and why does it matter?

Revit coordination refers to the process of combining the models produced by different disciplines — structural, mechanical, electrical, hydraulic, fire — into a single federated or combined model, then systematically reviewing it for conflicts.

When each discipline models independently, clashes between systems are inevitable. The structural engineer designs the framing without detailed knowledge of where the mechanical engineer will route their ductwork. The hydraulics consultant designs pipe runs without a complete picture of where the electrical engineer has placed their cable trays. In a complex building, hundreds of minor conflicts can exist across the combined design without anyone knowing until construction begins.

Revit coordination makes those conflicts visible before they reach the site. Clash detection tools within the BIM environment identify every point where two building elements intersect or come into spatial conflict. The engineering team then resolves each clash through a coordinated review process, adjusting routing, levels or sizing until the combined model is clean.

The result is a set of documentation that reflects a building that can actually be built as drawn — without on-site surprises.

The practical impact on project delivery

The benefits of coordinated BIM and Revit modelling are measurable across several areas of project delivery.

Fewer RFIs during construction. Requests for Information (RFIs) from builders and contractors are frequently triggered by documentation conflicts or missing coordination information. A well-coordinated Revit model reduces the volume of RFIs significantly because the information is already resolved and clearly documented.

Reduced variations. Variations are expensive. Many arise from conflicts between disciplines that were not resolved during design. Coordinated modelling addresses the root cause of a large proportion of variation events before they can occur.

Faster documentation. When all disciplines are working within a shared model environment, documentation is produced from a consistent and coordinated source. There is less back-and-forth between consultants reconciling conflicting drawings, and the overall documentation process moves faster.

Better outcomes for the builder. A builder tendering or constructing from a coordinated set of BIM documentation has a clearer picture of what is required. They can plan trades sequencing more accurately, reduce material waste and manage their programme with greater confidence.

Improved communication with the design team. Because the Revit model is three-dimensional and accessible to the broader project team, architects, certifiers and clients can interrogate the design in ways that flat drawings do not allow. Spatial relationships, service clearances and construction methodology are all visible in the model.

The difference between a BIM model and a coordinated BIM model

It is worth distinguishing between a project that uses BIM and a project that benefits from coordinated BIM. Many projects in Sydney involve individual consultants modelling their own scope in Revit — but if those models are never federated and reviewed together, the coordination benefits are largely lost.

A genuinely coordinated Revit model is one where all disciplines are brought together into a combined environment, conflicts are identified through a systematic clash detection process, and the resolved documentation reflects the agreed coordination outcomes. That process requires either a dedicated BIM manager or a multidiscipline engineering consultancy where all disciplines are under one roof and can coordinate directly.

When structural, mechanical, electrical, hydraulic and fire engineering are all delivered by the same team working from the same model, coordination is not an additional process layered on top of the design work. It is built into how the work is done from the start.

When is BIM coordination most valuable?

BIM and Revit coordination deliver the greatest value on projects with significant services complexity. Multi-residential apartments, commercial and mixed-use developments, education buildings, medical facilities, aged care facilities and government projects in Sydney all typically involve multiple engineering disciplines with overlapping spatial requirements. These are the projects where unresolved clashes carry the highest cost and risk.

On simpler projects, a lightweight coordination process may be sufficient. But on any project where three or more engineering disciplines are working within shared floor-to-ceiling zones — as is the case on most buildings above a single dwelling — full Revit coordination is worth the investment.

The cost of coordinating the model during design is consistently lower than the cost of resolving the equivalent conflicts during construction.

Greenview's BIM and coordination approach

Greenview models all disciplines within a single combined REVIT environment. Structural, civil, mechanical, electrical, hydraulic and fire engineering are all produced by the same team, working from the same model, in the same office. Coordination is not a handover process between separate firms — it happens continuously as the design develops.

That approach is the foundation of Greenview's coordinated engineering model and is a core part of what the firm offers as a multidiscipline engineering consultant in Sydney. It reduces clashes, speeds documentation and gives the broader project team — architects, builders, certifiers and clients — a higher-quality and more reliable set of information to work from.

If you are working on a project in Sydney or NSW and want to understand how a coordinated BIM approach could benefit your delivery, the Greenview team is happy to discuss it.