Among the most stubborn challenges in the construction industry, design clashes and high construction costs remain a top concern. Statistics show that up to 40 percent of construction projects' delays result from undetected design conflicts discovered only during construction works. Using traditional 2D CAD drawing makes these clashes unavoidable, as it becomes hard to detect design conflicts ahead of time.
What should be done? CAD-to-BIM conversion services will help construction companies detect clashes before starting construction, determine cost estimates precisely, and reduce construction costs significantly.
What is the difference between CAD and BIM?
To understand how CAD to BIM conversion helps reduce design clashes and construction expenses, it is crucial first to know the difference between these two approaches to designing buildings and other constructions.
What is CAD?
CAD is Computer-Aided Design, which is focused on creating 2D drawings or basic 3D models. The result is a drawing containing various elements representing different aspects of the construction project. In such designs, every element is represented as mere geometry.
What is BIM?
BIM stands for Building Information Modeling. This approach is more complex and focuses on creating data-rich 3D models. Unlike CAD, in BIM models, every object (wall, window, doors, HVAC ducts, and so on) carries embedded data about itself (dimensions, material composition, etc.).
Comparison of Features:
Feature | CAD | BIM |
Representation | 2D drawings/basic 3D models | Intelligent 3D models |
Information about Objects | Geometric | Parametric |
Clashes | Manual/Post-design | Automatic/Pre-construction |
Cost Estimation | Manual (takeoffs) | Automated |
Collaboration | File-based | Centralized Cloud-Based |
In conclusion, the main advantage of the BIM system is in additional information it allows to get about objects in designs.
What is CAD-to-BIM conversion?
So, what is CAD to BIM conversion and how can you benefit from it?
First of all, let us define this term. CAD to BIM conversion is the procedure of transforming 2D drawings (or basic 3D designs created using CAD technology) into intelligent 3D BIM models with embedded information.
How the conversion process takes place:
CAD drawings or files are imported into BIM modeling software.
Object representation switches from 2D drawings to 3D intelligent objects.
Information about dimensions, materials, cost, and other characteristics is added.
Model accuracy is validated.
The importance of converting CAD to BIM
Many construction companies possess millions of drawings stored in company archives, which cannot be used with contemporary technology. Thus, it is essential to convert them to BIM models.
How does CAD to BIM make clash prevention possible?
Let us see now how converting CAD to BIM helps detect design clashes early enough.
What are construction clashes?
Design clashes in construction projects usually happen when systems overlap in a physical plan. Some common examples of clashes:
• HVAC ducts overlapping structural beams
• Electrical conduits crossing water supply pipelines
• Fire sprinklers hitting ceiling lights
All these situations require changes during construction phase, which leads to expenses for rework.
BIM and automatic design clashes detection
One of the major advantages of BIM compared to CAD is automatic design clash detection.
Here is how it takes place:
• Multidisciplinary models are created and merged together in a single file
• BIM software automatically scans the model for design clashes
• Clashes are reported visually for every detected problem
• Benefits of BIM clash detection: 4D simulation
What benefits will early detection give you?
The main ones are listed below:
1. It is easier to avoid dangers during construction stages
2. Savings on material due to reduced rework (up to 15-25 percent)
3. Avoiding expensive changes during construction (costs of such changes amount to $20,000 for each on average)
4. Safety improvements due to clash elimination
5. Improved team coordination
As it has been proven, projects with BIM clash detection experience up to 30-40 percent less delay due to design conflicts than those using traditional CAD approach.
How CAD-to-BIM reduces construction costs
Now let us look at another important advantage of CAD to BIM conversion – reduced construction expenses.
What factors cause construction cost increases?
Using traditional CAD technology in projects, construction firms often have to deal with cost increases related to several important factors:
• Errors in manual quantity take-offs
• Meanwhile detection of clashes requiring changes on construction sites
• Rework due to incorrect design causing clashes
• Project delays due to poor team coordination
How does BIM allow saving construction costs?
1. Precise Quantity Take-Offs and Cost Estimations
BIM enables automatic quantity take-offs based on accurate measurements. Measurements are carried out automatically thanks to intelligent parametric objects in the model.
Benefits of 5D BIM:
• The model contains dynamic information about costs (it is recalculated each time a change in model is made)
• Reusability of template measurement allows saving time
2. Precise Forecast of Materials
BIM models contain information about necessary materials and their quantities. Such an approach allows:
• Accurate cost management
• Better material utilization due to precise planning
• Timing of procurement process
3. Reduced Rework Costs
Detection of design clashes helps avoid unnecessary work and saves significant expenses associated with that.
4. Reduced project duration
With centralization of models, repetitive operations are reduced. Labor and equipment schedules allow managing construction more efficiently and completing projects faster.
Comparison of cost drivers in BIM and CAD projects:
Cost Driver | CAD Approach | BIM Approach | Savings |
Quantity Take-offs | Manual (error-prone) | Automated | 20-30% |
Rework from Clashes | High (on site discovery) | Minimal (pre-detection) | 30-40% |
Material Wastes | Larger | Lower | 15-20% |
Duration of Works | Larger | Smaller | 10-20% |
Thus, using BIM reduces construction costs dramatically.
What else does CAD to BIM allow achieving?
Let us summarize the most important advantages of BIM that are not connected to reducing design clashes and saving construction funds:
Enhanced Visualization
Thanks to 3D model with precise parameters, all participants of construction process can imagine what the final product will look like. Also, analysis of lighting, energy use, and structure can be performed using various scenarios.
Improvements in Coordination
BIM technology allows working with models hosted in centralized cloud environment, which allows collaborating regardless of geographical locations and time differences.
Easy Model Revision
Changing a model in BIM becomes extremely easy as every revision reflects across the entire document automatically.
Greater Accuracy
Having a central source of information eliminates inaccuracies associated with using outdated files. Automation improves efficiency by increasing productivity.
Lifecycle Support of Facilities
Once a project is completed, the model still contains information needed to operate facilities. BIM technology provides full lifecycle support: from designing and construction through operating period to demolition.
When is it necessary to choose CAD to BIM conversion services?
What are typical projects for such a choice? Let us consider it below:
Typical Cases
• Large construction projects (schools, airports, medical complexes, and others)
• Projects requiring multidisciplinary collaboration and precise coordination
• Construction project involving existing CAD drawings
Factors driving adoption of BIM
• Necessity to comply with BIM mandates in some cases
• Digital transformations in the industry
• Cost reduction
Conclusion
In conclusion, it should be stated that CAD to BIM conversion allows detecting clashes automatically prior to construction works, improving accuracy of cost estimation, and reducing construction expenses significantly.
It saves up to 40 percent from clashes, allows improving quantity accuracy by 20-30 percent, and reduces time needed to complete the project by 10-20 percent.
Highly recommended service by CAD Drafting Services for any construction company!
Frequently Asked Questions
1: What is CAD to BIM conversion services and why do you need them?
CAD to BIM conversion is the process of transforming CAD drawings into intelligent BIM models with embedded information. Why would you need it? To perform automated clash detection before construction starts, estimate construction cost accurately, and improve collaboration among project participants.
2: What is the price of converting CAD to BIM?
The cost of such service may vary significantly depending on particular circumstances and amount to $500 to $5000+. However, it will prove itself economically reasonable because it allows reducing cost of rework (up to 40 percent savings).
3: Is it possible to convert existing CAD drawings to BIM?
Absolutely! Professional services will help turn all your CAD drawings into intelligent 3D models with embedded information, useful for big construction projects.
4: Why would I want to use BIM instead of CAD to reduce costs?
BIM offers a number of opportunities for construction companies, which enable savings on materials, labor costs, and other important factors. Up to 40 percent savings can be achieved using this technique.
5: What Software is Used for Converting CAD to BIM?
The most commonly used software that converts CAD to BIM is Revit, which allows seamless communication among all parties involved in the project. It involves importing the CAD files into Revit and generating intelligent parametric objects with embedded data.
6: Is It Worthwhile to Convert CAD to BIM for Small Projects?
Yes. Both big and small projects have a lot to gain by using CAD to BIM conversion. These include improvements in accuracy (fewer mistakes), collaboration (coordinated multidisciplinary design), and efficiencies (automation of certain functions).