Before Your Scan to BIM Services: Site Preparation Checklist & Best Practices
One thing I have learned from working on point cloud projects is this: the quality of your BIM model starts well before anyone opens Revit.
It starts on site.
If the site is not properly prepared before the laser scan, the point cloud data comes back with gaps, noise, or misaligned scan positions. That means more processing time, more back-and-forth, and a model that does not accurately reflect the actual building. Getting our scan to BIM services to deliver a clean, accurate model depends heavily on what happens at the site level first.
This checklist covers what to sort out before the scanner arrives.
Why Site Preparation Matters for Scan to BIM Conversion Services
A 3D laser scanner captures everything in its line of sight — walls, pipes, beams, furniture, people, dust, and temporary objects. It does not know what is permanent and what is not.
When we receive point cloud data for scan to BIM conversion services, we work with what the scanner captured. If a trolley was parked in front of a wall during the scan, that section of wall is missing from the data. If a temporary partition was up, it shows up in the model as a real wall.
Cleaning up bad data takes time. In some cases, areas need to be re-scanned, which costs money and pushes timelines out.
Good site preparation removes these problems before they happen.
The Site Preparation Checklist
1. Clear Temporary Objects and Clutter
Walk through the space before the scan and remove anything that should not be in the final model:
- Temporary partitions or hoarding
- Construction materials, scaffolding, and equipment
- Furniture that does not form part of the permanent building
- Boxes, pallets, and stored items in corridors or plant rooms
The cleaner the space, the more complete the point cloud data will be.
2. Make Sure All Permanent Elements Are Visible
This one is easy to overlook. Make sure:
- Ceiling tiles are in place (or noted as removed intentionally)
- Access panels to risers and plant rooms are open if those areas need to be captured
- All doors are in the position you want modelled — open or closed, but consistent
If part of the structure is hidden behind cladding or linings that will eventually be removed, flag this before the scan. It affects what LOD (Level of Detail) is achievable from the data.
3. Coordinate With the Scanning Team on Control Points
Control points, also called targets or reference markers, are placed around the site so that individual scan positions can be stitched together accurately during registration.
Before the scan:
- Agree on the number and placement of targets with your scanning team
- Make sure targets can be clearly seen from multiple scan positions
- Do not move targets once they are placed — even slightly
Poor target placement is one of the most common reasons scan data comes back misaligned.
4. Plan the Scan Positions in Advance
The scanner needs a clear line of sight to capture surfaces properly. Scan positions should be planned so that:
- Every wall, floor, and ceiling surface is captured from at least two positions
- Columns and other obstructions are accounted for — the scanner cannot see through them
- Stairwells, risers, and plant rooms are given dedicated scan positions
A quick walk-through with a rough sketch before the scan day saves a lot of trouble later.
5. Control Access During the Scan
People walking through a scan zone create noise in the point cloud. Organise the scan so that:
- Other trades or staff are kept out of the area being scanned
- No one walks between the scanner and a surface mid-scan
- Access routes for the scanning team are kept clear
On busy sites, this usually means scheduling the scan for early morning or outside normal working hours.
6. Note Any Areas That Cannot Be Scanned
If your site has active hazardous areas (electrical rooms, high-temperature equipment), ensure the scanning team has all relevant safety briefings and that site supervisors are on hand. Site safety protocols must be followed at all times.
When we receive the data at SolidCAD, we need to know which areas are missing from the cloud so we can flag them in the model rather than guess at what is there.
How MEP Shop Drawing Services Improve Project Efficiency
Here is where I see the real difference on projects that use proper shop drawings versus those that do not.
Fewer RFIs — RFI stands for Request for Information. It is what happens when someone on site hits a problem and needs an answer before they can continue. Too many RFIs slow a project down badly. Good MEP coordinated shop drawings resolve the questions before they become on-site problems.
Faster installation — When trades have clear, detailed drawings to follow, they work faster and with more confidence. There is less stopping to figure things out, less waiting for clarification, and less second-guessing.
Better prefabrication — When pipe runs, duct sections, or electrical assemblies are mapped out precisely in the drawings, components can be fabricated off-site and brought in ready to install. This cuts on-site labour time significantly.
Clearer communication between trades — Mechanical, electrical, and plumbing contractors often work in the same space at the same time. Coordinated drawings give everyone the same reference point, which reduces arguments and misunderstandings on the job.
How Scan to BIM Conversion Services Handle the Data After the Site Scan
Once the point cloud data is captured and registered, our team at SolidCADs processes it into a BIM model using Autodesk Revit. The point cloud is imported as a reference and used to model architectural, structural, and MEP elements to the required LOD.
The accuracy of the final model depends directly on the quality of the scan data. A well-prepared site produces a clean, dense point cloud — and that translates into a model that reflects actual site conditions accurately.
Common file formats we work with include .e57, .rcp, and .rcs. If you are unsure what format your scanning equipment outputs, get in touch before the scan and we can confirm compatibility.
Point cloud files can be quite large (50MB–several GB depending on project size and scan resolution), so we’ll confirm file transfer methods with you before the scan.
A Few Things Worth Doing the Day Before
- Do a final walk-through and remove anything missed earlier
- Check that all lights are working — poor lighting does not affect laser scanners directly, but it helps the survey team move safely and efficiently
- Confirm access arrangements for all areas that need to be captured
- Make sure the scanning team has a current set of architectural drawings to reference for target placement
Small things done the day before prevent delays on the scan day itself.
FAQs
Does site preparation affect the accuracy of the BIM model?
Yes, directly. Clean, unobstructed scan data produces a more accurate point cloud. Gaps or noise in the data mean the BIM model will have areas of uncertainty, which the modelling team has to flag or interpret.
How long does a typical site scan take?
A single floor of a standard commercial building might take half a day. A multi-storey building with complex plant rooms typically takes 2–5 days depending on size and system complexity. . Your scanning team will give a site-specific estimate.
What is the best LOD to request for a scan to BIM project?
It depends on the purpose. LOD 200–300 covers most renovation and design coordination needs. LOD 400 is used when fabrication-level detail is needed for MEP or structural elements. We recommend discussing this before the scan so the site preparation and scan plan are set up accordingly.
Final Thoughts
A scan to BIM project is only as good as the data it starts with. Taking the time to prepare the site properly is the single best thing you can do to make sure the point cloud data is complete and the model we build from it is accurate.
If you are planning a scan to BIM project and want to talk through site preparation or what to expect from the process, contact the SolidCAD team or call +61478835774 . We work with architects, engineers, and contractors across Australia and can advise on what your project needs before the scanner arrives.
