Laser scanning has completely changed how building surveys are produced across the UK and Ireland. What once required manual measurements and sketches can now be captured in the form of millions of accurate data points within hours.
But once the scanning is complete, surveyors face a practical question that many architects also ask.
Should the deliverable be Scan to CAD drawings or a Scan to BIM model?
Both options come from the same point cloud data, yet they serve different purposes in architectural workflows. Understanding when to deliver each format helps building surveyors provide architects with information that fits directly into their design process.
This blog explains how Scan to CAD and Scan to BIM differ, when architects prefer each format, and how surveyors can choose the right deliverable for projects across the UK and Ireland.
What Is Scan to CAD
Scan to CAD is the process of converting laser scan point cloud data into precise 2D CAD drawings.
These drawings are typically delivered in AutoCAD and represent the existing building conditions in a format architects have used for decades.
Typical Scan to CAD deliverables include
- Existing floor plans
- Building elevations
- Roof/attic plans
- Cross sections
- Site Topo-plan
For many architects, especially those working on refurbishment or planning stage projects, these drawings provide a reliable starting point for design development.
Why Scan to CAD Is Still Widely Used
Even as BIM adoption grows, CAD drawings remain extremely common in architectural workflows.
Scan to CAD is often preferred when
- Architects need base drawings for planning submissions
- Projects involve minor renovations or interior modifications
- The architectural team primarily works in AutoCAD
- Quick and lightweight files are required for early design work
For these situations, CAD drawings provide the necessary information without adding the complexity of a full BIM model.
What Is Scan to BIM
Scan to BIM converts the same point cloud data into a three-dimensional Building Information Model.
Instead of lines and layers, the building becomes a digital model composed of elements such as
- Walls
- Floors
- Doors and windows
- Structural components
- Roof systems
These models are usually created in BIM software such as Revit and can contain detailed geometric and spatial information.
Why Scan to BIM Is Becoming More Common
Many architecture and construction projects in the UK and Ireland now rely on BIM workflows for design coordination.
A Scan to a BIM model allows architects and engineers to
- Visualize existing buildings in three dimensions
- Coordinate architecture, structure, and MEP systems
- Detect clashes before construction begins
- Generate quantities and schedules
- Improve collaboration between project teams
For large developments, infrastructure projects, or complex renovations, BIM models provide significantly more flexibility than traditional CAD drawings.
When Architects Prefer Scan to CAD
Measured building surveyors often assume that architects always want BIM models. In reality, the choice depends on how the project will be developed.
Scan to CAD is typically preferred when
- The project is at the concept or planning stage
- Architects need base drawings for design proposals
- The building requires documentation rather than detailed coordination
- The architectural team uses a 2D AutoCAD platform
For these cases, delivering clean and well-organized CAD drawings helps architects start designing immediately.
When Architects Prefer Scan to BIM
There are many situations where architects specifically request BIM models rather than 2D drawings.
Scan to BIM becomes valuable when
- The project requires BIM coordination with consultants
- Structural and MEP upgrades are expected
- Architects are working in Revit or BIM-based environments
- The project involves complex geometry or large-scale redevelopment
In these scenarios, BIM models provide deeper insight into the building’s spatial relationships and construction details.
What Measured Building Surveyors Should Ask Before Delivering Data
The best survey deliverables are not decided by technology alone. They are decided by how architects plan to use the information.
Before delivering survey outputs, it helps to ask a few key questions
- Is the architectural team working in AutoCAD or Revit
- Will the project involve BIM coordination with consultants
- Is the building expected to undergo major structural or MEP changes
- Will the model be used for construction documentation later
Understanding the architect’s workflow ensures the survey deliverable supports the project instead of slowing it down.
A Practical Approach Many Surveyors Now Use
Many experienced surveyors across the UK and Ireland now follow a flexible workflow.
A common approach is:
- Deliver accurate Scan to CAD drawings during early design stages
- Preserve the point cloud data for future use
- Convert the survey into a Scan to BIM model if the project progresses into BIM coordination
This approach allows surveyors to provide both simplicity and scalability depending on the needs of the project.
Why the Right Deliverable Matters
Measured building surveys form the foundation of architectural design. When survey data is structured correctly, architects can immediately begin working with accurate building information.
Whether the output is Scan to CAD drawings or a Scan to BIM model, the goal is the same. Deliver information that integrates smoothly into the architect’s workflow.
Surveyors who understand how architects actually work become far more valuable collaborators in the design and construction process.
Frequently Asked Questions
What is the difference between Scan to CAD and Scan to BIM
Scan to CAD converts laser scan data into 2D drawings such as floor plans, elevations, and sections.
Scan to BIM converts the same scan data into a 3D digital building model with intelligent architectural elements.
Both originate from point cloud data but serve different design workflows.
Do architects in the UK prefer Scan to BIM over CAD
Not always. Many architects still rely on CAD drawings for planning submissions, concept design, and renovation documentation. BIM models are more commonly requested for large projects, coordination-heavy developments, and BIM-based construction workflows.
When should a measured building survey be delivered as a scan to BIM
Scan to BIM is most useful when
- The project involves BIM coordination
- Multiple consultants need to collaborate in a BIM environment
- The project requires 3D modeling of existing conditions
- Architects are working primarily in Revit
Is Scan to CAD still relevant in modern architecture projects
Yes. Scan to CAD remains widely used across the UK and Ireland, especially for refurbishment projects, heritage buildings, planning applications, and interior design projects where simple and accurate 2D drawings are sufficient.
Can point cloud data be converted into both CAD and BIM
Yes. Laser scan point cloud data can be converted into CAD drawings or BIM models, depending on the project requirements. Many surveyors deliver CAD drawings first and create BIM models later if the project moves into BIM workflows.