BIM clash detection can identify conflicts between architectural, structural and MEP models before construction begins. But a clash report alone does not resolve those issues. Each clash still needs to be reviewed, prioritised, assigned to the right team and checked again once changes have been made.
This is where many projects run into difficulty. Some clashes affect structure, access, installation or maintenance. Others may be duplicates, false positives or lower-priority issues. Without a clear process, teams can spend time reviewing long reports without knowing which problems are most likely to delay work on site.
Why Clash Reports Alone Don’t Prevent Project Delays
A clash report is a useful starting point, but it is not a solution by itself. It shows where model elements may conflict, but it does not decide which issues matter most, who should resolve them, or whether the proposed fix will create new problems elsewhere.
On larger projects, a federated model may produce hundreds of clashes across architectural, structural and MEP disciplines. Some will be serious, such as a duct running through a beam or pipework blocking access to a plant. Others may be caused by modelling tolerances, be repeated across multiple views, or be irrelevant to construction.
False positives and duplicate clashes can make reports harder to act on. Automated tools are useful for identifying geometric conflicts, but they do not always understand design intent, sequencing or practical buildability. This is why BIM clash detection should sit within a wider coordination process.
Clash Detection vs BIM Coordination
Clash detection and BIM coordination are closely linked, but they are not the same thing.
In practical terms, clash detection identifies the issue. BIM coordination turns that issue into an agreed, buildable solution.
Which BIM Clashes Should Be Prioritised First?
Not every clash carries the same level of risk. Structural clashes usually need early attention because they can affect major design elements such as beams, columns, slabs or load-bearing walls.
MEP clashes are also a common priority, especially in congested spaces such as ceiling voids, risers, corridors and plantrooms. Ducts, pipework, cable trays and containment systems often compete for limited space.
Access and maintenance clearances should also be reviewed carefully. A component may fit in the model but still be difficult to install, inspect or maintain safely.
Clashes linked to prefabrication, offsite manufacture, procurement or installation sequencing should be prioritised before decisions are locked in. Once materials have been ordered or components manufactured, resolving clashes can become more difficult and costly.
What Should a Useful Clash Report Include?
A useful clash report should make action easier, not simply list problems. It should include:
Without this context, a report can become a list of unresolved issues rather than a tool for decision-making.
Who Owns Clash Resolution?
Clash resolution is usually a shared responsibility. A BIM coordinator or BIM manager may manage the process, but they do not typically resolve every clash on their own.
The relevant technical leads check whether proposed changes are suitable. Architects, structural engineers and MEP teams agree on design adjustments. Contractors and specialist subcontractors confirm whether proposed solutions are buildable. Project managers monitor risk, programme impact and deadlines.
Each clash should have a single clear owner, even if several teams contribute to the solution.
What a Good BIM Clash Detection Workflow Looks Like
A practical workflow usually follows this sequence:
- Collect architectural, structural and MEP models
- Federate the models
- Set clash rules and tolerances
- Run targeted clash checks
- Remove false positives and duplicates
- Group clashes by system, location and severity
- Assign responsibility
- Review issues in coordination meetings
- Update the models
- Re-run checks until key clashes are closed
The process should continue until the model is suitable for the next stage of design, procurement or construction.
When Should Clash Detection Happen?
BIM clash detection should happen early enough to influence design, procurement and installation decisions, not as a final check before work begins on site.
It is most useful during design development, before procurement, prefabrication, or offsite manufacture, before installation, after major model updates, and at regular coordination milestones.
When Should You Use an External BIM Clash Detection Service?
External support may be useful when internal teams are overloaded, multiple disciplines are working in separate models, MEP coordination is complex, or the project has tight deadlines.
It may also be needed when the team requires clean reports, regular coordination support or build-ready outputs rather than raw clash data.
Final Thoughts
The value of BIM clash detection is not the report itself. It is the ability to resolve the right issues early enough to protect the programme, reduce rework and give teams confidence that the model is ready to build from.
FAQs About BIM Clash Detection
What is BIM clash detection used for?
BIM clash detection is used to identify conflicts between architectural, structural and MEP models before construction begins.
What are the three main types of clashes in BIM?
The three main types are hard clashes, soft clashes and workflow or sequencing clashes.
What is the difference between clash detection and BIM coordination?
Clash detection finds model conflicts. BIM coordination manages the process of reviewing, assigning and resolving them.
What software is used for BIM clash detection?
Common tools include Autodesk Navisworks, Revit, Solibri, BIMcollab, Revizto and AutoCAD MEP.
Does clash detection reduce construction costs?
It can help reduce costs by identifying issues before they lead to site changes, rework, or installation delays.
