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Why is BIM Clash Detection and Coordination necessary?

May 24, 2022

Clash detection

Clash detection is the process of finding the interferences between two services. To resolve the interferences, we were coordinating with multiple stakeholders. BIM provides a way to reduce the time and costs associated with the site execution process.

Multiple stakeholders are involved in the construction process, including architects, structural engineers, mechanical engineers, electrical engineers, and engineering services providers. These people can work with BIM to find the clashes and resolve them before construction begins.

Before BIM all the coordination happened at the site (conventional methods) there were lots of reworks, poor coordination with the stakeholders, and materials waste which ended up with delays in project delivery and increased the cost to the client.

In the modern age, we are finding and resolving clashes between the services using BIM and Navisworks. It gives more clarity and reduces the rework at the site and material waste ending up with delivering the project on time and cost-effective.

In the BIM process, there are three types of clashes

1. Hard clashes

2. Soft clashes

3. Workflow clashes.

Hard clashes

Hard clashes are the actual clashes between the two services which will be addressed by the design team and the contractors. Those people will give the solution to resolve the clashes. During this exercise, all the stakeholders know the critical areas, achievable ceiling heights, Services arrangements & Supports for the services.

Collaborative working is the distinguishing aspect of this level and Level 2 requires streamlined information exchange related to a project and seamless coordination between all the systems and the stakeholders.

For example, the duct is clashing with fire pipes and cable trays.

duct is clashing with fire pipes and cable trays, image

After that, it’s resolved by rearranging the services.

resolving the duct, clashing with fire pipes and cable trays, image

Soft clashes

Soft clashes indicate the services don’t have proper space to access for maintenance. These are the clashes where we aren't able to achieve the minimum clearance during the site executions.

Checking the access for the VAV Box in the grid ceiling.

Checking the access for the VAV Box in the grid ceiling, image

Workflow clashes

Workflow clashes indicate the sequence of operations held at the site. If any sequences are missing or delayed it will affect the workflow of the other stakeholders.

For example, the pipe sleeves need to be placed before slab casting. Otherwise, it’s a rework for doing the core cut.

Benefits of BIM clash detection

BIM clash detection is an effective method for inspecting designs, identifying clashes, and preparing clash reports during the engineering and design stage. It helps:

  • Reduce instances of human error
  • Prevent expensive late-stage redesign
  • Prevent scheduling clashes
  • Plan efficient building operation
  • Ensure compliance with regulatory requirements
  • Ensure the master model satisfies safety and performance requirements

How Laser scanning is useful for coordination

The majority of base build services are installed without BIM coordinated drawings. The site installation differs from the base builder shop drawings & 3D BIM models. For this case, we can't do a proper interior design.

We can use advanced laser scanning to capture the site condition to develop the 3D model. This helps to do an optimistic design and will reduce the number of site walks, rework at the site, and material waste and time involved during the execution process. We can coordinate with existing services installed at the site.


BIM Clash Detection has wholly transformed the engineering design area and it allows to visualize, evaluate, and eliminate clashes in advance.

Simultaneously, BIM and clash detection have made architects' and engineers' lives easier by allowing them to regulate and supervise various parts without sacrificing originality at the last minute to complete a project.

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