In existing building renovation, commercial space upgrades, aging factory refurbishment, and the reconstruction of missing as-built records, the first challenge is often not how to create a BIM model. It is whether the available documents still represent current site conditions accurately.

After a building enters service, wall changes, secondary fit-outs, equipment replacement, MEP modifications, and construction deviations can gradually create differences between the original design drawings, as-built drawings, and the actual building. If a project team begins design or BIM modeling directly from outdated drawings, later space planning, equipment layout, and MEP coordination may be based on inaccurate existing-condition data.

Scan-to-BIM starts again from the real site. 3D scanning captures the building's current spatial condition as measurable, reviewable point cloud data. Depending on the project, this data can then move into CAD, Revit, SketchUp, or other downstream design and modeling workflows, supporting renovation design, engineering coordination, and as-built deliverables.

1. Which Existing Building Projects Are Suitable for Scan-to-BIM?

Scan-to-BIM requirements for existing buildings generally focus on two needs: reconstructing missing or outdated site records, and providing a reliable spatial foundation for renovation design and project implementation.

An older building may have incomplete as-built drawings. A hotel, shopping center, or office may have undergone several rounds of fit-out work. Equipment, partitions, and MEP systems inside a factory may also have been adjusted repeatedly. In these situations, the original documents may serve only as a reference, and the project team must reconfirm current walls, beams, columns, doors, windows, floor heights, equipment, and visible services.

A second group of requirements appears during renovation. Commercial reconfiguration, office refurbishment, factory equipment upgrades, and MEP modifications require more than the overall dimensions of a space. Teams also need the actual spatial relationships between beams, columns, equipment, ducts, cable trays, and other building elements to determine whether a proposed design can be implemented.

Compared with relying only on manual measurements, photographs, and handwritten notes, a point cloud continuously preserves three-dimensional spatial relationships. Areas captured completely can be viewed, measured, and reviewed again, and the data can continue to serve as an existing-condition reference for CAD and BIM modeling.

Scan-to-BIM is therefore commonly used for existing building renovation, hotel and commercial space upgrades, complex fit-out measurement, aging factory refurbishment, missing as-built documentation, and projects that require an as-built BIM model.

2. What Are the Main Stages from Site Scanning to BIM?

A complete Scan-to-BIM project does not convert a point cloud directly into a finished BIM file. It connects site capture, point cloud processing, drafting, modeling, and verification in one workflow.

A typical workflow can be summarized as:

On-site 3D scanning → point cloud processing and preparation → existing-condition review → point cloud or CAD data imported into modeling software → BIM / 3D modeling → model-to-point-cloud verification → deliverable preparation.

Software environments and deliverable standards vary between projects, so point cloud data can enter downstream modeling in different ways. Some BIM teams import the 3D point cloud directly into Revit and create architectural, structural, or MEP elements while referencing the scan. Other design teams first prepare CAD floor plans and sections, organize the 2D drawings, and then continue modeling in SketchUp, Revit, or similar software.

Both approaches are part of Scan-to-BIM. The difference lies in how the intermediate data is organized.

3. Site Scanning and Point Cloud Preparation: Recording Existing Conditions First

Site data is the foundation of Scan-to-BIM. The planned modeling scope should therefore define what needs to be captured during scanning.

Architectural teams may focus on walls, beams, columns, slabs, stairs, door and window openings, floor heights, and primary space boundaries. Factory and engineering projects may also need equipment, structural grids, and large-space geometry. If an MEP renovation is planned, visible ducts, cable trays, fire protection pipes, plumbing services, and equipment locations should be captured wherever practical.

In a SHARE3DCAM workflow, handheld 3D laser scanners such as SHARE SLAM S20 and SHARE SLAM S100 can capture the existing building as a point cloud. After scanning, the data can be processed, viewed, measured, and prepared in SHARE PointClouds Studio.

Before drafting or modeling begins, the point cloud may need to be leveled, rotated, and cropped according to the project scope. Irrelevant areas can be removed, while the required data can be organized by floor, room, or discipline. A prepared point cloud makes it easier to review structural relationships, extract dimensions, and establish the model.

Data completeness must also be checked at this stage. Point cloud processing can organize information that was captured, but it cannot reconstruct data that was never scanned. If equipment, cabinets, or building elements completely block an area required downstream, the team will still need supplementary scanning or manual measurement on site.

4. How Can Point Cloud Data Move into Revit and SketchUp?

After point cloud preparation, the next step is to connect the existing-condition data with the design and modeling workflow. In the current SHARE3DCAM workflow, teams can use two common paths.

4.1 Path One: Import an RCS Point Cloud Directly into Revit

For architectural, structural, and other BIM projects that need to retain a complete three-dimensional existing-condition reference, the prepared point cloud can be exported in RCS format and loaded into Revit.

Modelers can view the point cloud in plan, elevation, section, and 3D views, then create walls, beams, columns, slabs, doors, windows, and other architectural or structural elements according to their actual site positions. SHARE PointClouds Studio can export an RCS point cloud for use in Revit as a reference for element creation and spatial interpretation.

This path is useful for projects with complex spatial relationships that need to be reviewed frequently from different angles. Stairs, voids, beam-and-column relationships, and irregular structures can be less intuitive if they are first reduced entirely to 2D drawings. A directly referenced point cloud allows modelers to return to the captured site geometry whenever needed.

The workflow can be summarized as:

Site capture with a SHARE3DCAM handheld laser scanner → processing and preparation in SHARE PointClouds Studio → RCS point cloud export → Revit → BIM modeling based on the point cloud.

4.2 Path Two: Prepare a CAD Draft before Modeling in SketchUp

Many teams working on renovation design, commercial interiors, and offices still begin with a CAD base drawing. In these projects, the point cloud can first be organized into familiar 2D drafting outputs before the data moves into SketchUp or other 3D modeling software.

The CAD drafting tools in SHARE PointClouds Studio can assist with generating initial CAD floor plans and sections from point cloud data. The software can also export DWG/DXF files with a point cloud underlay. These outputs are CAD drafts for downstream design work, not complete drawings that should be used directly as final construction documents.

After export, designers can use the point cloud underlay in AutoCAD to correct, supplement, and develop wall lines, doors, windows, openings, and local structural elements. Because the point cloud remains available in the drawing, uncertain dimensions or geometry can be checked against the captured site data instead of relying only on automatically extracted linework.

After the CAD drawing is prepared, it can be imported into SketchUp. The team can confirm scale and units, trace wall boundaries and openings from the CAD data, and use height and structural information from the point cloud or drawings to build walls and other spatial elements.

This workflow can be summarized as:

Site capture with a SHARE3DCAM handheld laser scanner → SHARE PointClouds Studio → draft CAD floor plan or section with point cloud underlay → correction and additional drafting in AutoCAD → SketchUp → downstream modeling based on CAD and point cloud references.

The same CAD outputs can also continue into Revit according to the project team's established process. CAD is therefore an optional intermediate deliverable in Scan-to-BIM, not a mandatory step for every project.

Projects that need to preserve a complete three-dimensional spatial reference can use the point cloud directly in Revit. Teams that already work primarily with CAD and SketchUp can create and correct a CAD base drawing before downstream modeling. In either path, elements, properties, discipline-specific information, and final deliverables must still be completed according to project requirements.

5. BIM Model and Point Cloud Verification: Reviewing Existing Deviations and Spatial Clashes

In an existing building project, the point cloud can continue to support the team after the model has been created. In addition to providing the initial modeling reference, it can help identify differences between the model and the real site, as well as potential clashes between a proposed renovation and existing conditions.

MEP renovation is a typical example.

Existing ceiling spaces may already contain ducts, cable trays, fire protection pipes, plumbing services, and equipment. A new renovation may add or modify part of the MEP system. If the design relies only on older drawings, a route that appears workable on paper may conflict on site with a beam, existing equipment, or installed services.

By bringing the existing-condition point cloud and the proposed BIM model into a downstream BIM coordination or clash-detection environment, teams can review whether a new duct conflicts with an existing beam, whether a cable tray overlaps installed services, whether sufficient equipment installation space remains, whether ceiling clearance meets the requirement, and whether a revised service route can fit within the available space.

Architectural and structural renovation can require similar checks. When adding partitions, stairs, equipment foundations, or local structural elements, the relationship between the model and point cloud can help the team assess whether the new design is constrained by existing conditions.

Verification for an as-built project has a different emphasis. The established model is compared with the site point cloud to check whether walls, beams, columns, doors, windows, equipment, and major services show significant deviations from actual conditions.

Model verification in Scan-to-BIM can therefore be understood in two directions: checking whether the existing-condition model is consistent with the site, and checking whether a proposed design will create spatial conflicts within the existing building.

The second direction is particularly important for MEP renovation, equipment replacement, factory planning, and complex commercial fit-out projects.

6. What Deliverables Can a Scan-to-BIM Project Produce?

Final Scan-to-BIM deliverables depend on the intended project use. Not every project produces the same outputs.

Early-stage existing building renovation may require an existing-condition point cloud, CAD floor plans, and sections as a base for design. Complex engineering projects may continue into architectural, structural, or MEP BIM models. Projects that need to reconstruct as-built records may require an as-built model with element properties and deliverable information completed according to the project specification.

A Scan-to-BIM project may therefore retain point clouds, CAD drawings, 3D models, BIM models, and related verification records at the same time.

The point cloud does not lose its value after the BIM model is established. It remains a reusable site dataset for later design changes, MEP coordination, site review, or a future renovation cycle.

Across the workflow, SHARE3DCAM primarily supports the front end of BIM modeling through reality capture, point cloud processing, and practical data outputs.

After SHARE3DCAM handheld laser scanners capture the building, SHARE PointClouds Studio can process, prepare, measure, and review the point cloud. Teams can export RCS point cloud data directly to Revit, or create initial CAD floor plans, sections, and DWG/DXF files with a point cloud underlay. After correction in AutoCAD, the outputs can continue into SketchUp, Revit, or other downstream modeling software.

In other words, SHARE3DCAM does not position the workflow as automatically generating a complete BIM model after scanning. It converts the real site into a data foundation that can be measured, reviewed, drafted, and modeled, then connects that data with the project team's established CAD and BIM processes.

7. Frequently Asked Questions

Q1. Does Scan-to-BIM generate a BIM model directly after scanning?

No. Scanning first captures the building as a 3D point cloud. The point cloud can be used directly as a BIM modeling reference, or it can be organized into CAD drawings before downstream 3D modeling. Elements, properties, and discipline-specific information in the final model must still be created and completed according to project requirements.

Q2. Does every Scan-to-BIM project need CAD drawings first?

No. If a project needs to retain a complete three-dimensional site reference, the prepared point cloud can be exported from SHARE PointClouds Studio in RCS format and imported directly into Revit for BIM modeling.

If the team mainly works with CAD and SketchUp, it can first use SHARE PointClouds Studio to assist with generating draft CAD floor plans or sections. The DWG/DXF file with a point cloud underlay can then be corrected and supplemented in AutoCAD before it is used for modeling in SketchUp.

Q3. Why does a CAD draft still need to be revised in AutoCAD?

Scanning and software-assisted extraction support early-stage data capture and basic linework preparation. Final drawings must still be corrected according to site conditions and the project's drafting standards.

A CAD file with a point cloud underlay allows designers to compare wall lines, doors, windows, openings, and local structures directly with the captured site. This provides a more practical basis for reviewing extracted linework than an isolated drawing alone.

Q4. What is the main value of point cloud data in a BIM project?

Point cloud data provides a current spatial record of the existing building, reducing reliance on historical drawings, site photographs, and human memory.

After the model is established, the same point cloud can continue to support deviation checks between the model and the site, as well as spatial verification between a proposed design and existing conditions. One site dataset can therefore support both early modeling and downstream review.

Q5. Why is the combination of point cloud data and BIM particularly useful for MEP renovation?

Existing building services are often complex, with ducts, cable trays, fire protection pipes, plumbing services, structural beams, and equipment sharing limited space.

If a new system is designed only from older drawings, insufficient space or clashes may not be discovered until construction. Capturing current conditions as a point cloud and checking them with the proposed BIM model can help identify these issues earlier.

Q6. How can SHARE3DCAM scan data move into Revit and SketchUp?

Teams can select a path according to their established workflow.

Revit path: SHARE3DCAM handheld laser scanner → SHARE PointClouds Studio → RCS point cloud → Revit → BIM modeling based on the point cloud.

SketchUp path: SHARE3DCAM handheld laser scanner → SHARE PointClouds Studio → CAD draft with point cloud underlay → correction in AutoCAD → SketchUp → downstream modeling based on CAD and point cloud references.

Both paths begin with the site point cloud. They differ only in how the downstream data is organized and how the team prefers to model.

8. Summary

The purpose of Scan-to-BIM for existing buildings is not to complete a single 3D scan or to generate a BIM model automatically after scanning. It is to establish a data workflow from the real site to downstream design, modeling, and verification.

The complete workflow can be summarized as:

On-site scanning → point cloud processing and preparation → existing-condition review → RCS point cloud or CAD base drawing → BIM / 3D modeling → deviation and spatial clash verification between the model and point cloud → BIM / as-built deliverables.

In a SHARE3DCAM workflow, handheld laser scanners such as SHARE SLAM S20 and SHARE SLAM S100 capture the building, while SHARE PointClouds Studio supports point cloud processing, preparation, measurement, review, and initial CAD outputs. The RCS point cloud can move directly into Revit, or a CAD draft with a point cloud underlay can be corrected in AutoCAD before continuing into SketchUp or another modeling workflow.

For existing building renovation, the practical value of this workflow is that the model begins with captured site data and can still be checked against the point cloud after modeling. This provides a more reliable spatial basis for downstream design, renovation, coordination, and project implementation.