Point Cloud to BIM (PC2BIM): Process, Accuracy, and What to Expect in 2026

asadabbas20
Jun 6
3 min read

Point Cloud to BIM (PC2BIM) has become the default workflow for refurbishment, retrofit, heritage, and as-built documentation projects. It captures a building exactly as it stands today and converts it into a fully usable Revit or ArchiCAD model. Done well, it compresses weeks of measured-survey and drafting work into days.

This guide explains the full PC2BIM workflow: equipment, accuracy, software, deliverables, and what UK practices should expect to pay in 2026.

What is Point Cloud to BIM?

A point cloud is a 3D digital record of a physical space, made up of millions of individually measured points. A laser scanner sweeps a building or site and captures geometry to millimetre accuracy. The point cloud is then loaded into BIM software (Revit, ArchiCAD, AECOsim) and modellers rebuild the geometry — walls, floors, columns, MEP — at the LOD required by the project.

The output: a precise as-built BIM model that matches reality, not the original drawings (which are usually wrong by the time a refurb starts).

When PC2BIM is the right workflow

Heritage and listed buildings — fabric is irregular and out of square; manual measured survey misses critical details.
Refurbishment and change of use — original drawings are usually outdated or missing.
MEP retrofits — existing services need to be modelled accurately for clash detection.
Facade engineering — large facades benefit from millimetre-level scan accuracy.
Asset registration and FM handover — owners increasingly require LOD 500 as-built models.
Insurance and legal documentation — disputes often hinge on the precise condition of a structure at a given date.

The 5-step PC2BIM workflow

Step 1 — Site survey

A surveyor sets up a Leica RTC360, Faro Focus, or Trimble X7 at multiple positions throughout the building. Each scan position captures a 360° sweep — typically taking 2–4 minutes per setup. A medium commercial building might need 80–200 individual scans.

Accuracy at this stage: 2–6 mm at 10 m range. Density: 1 point every 3 mm at close range.

Step 2 — Registration

Individual scans are stitched together in Cyclone REGISTER 360, RealityCapture, or Faro Scene. Targets, sphere fittings, and cloud-to-cloud registration align everything to a single coordinate system. The output is one unified point cloud (RCP or E57 format) typically 5–50 GB in size.

Step 3 — Modelling in Revit

The registered cloud is imported into Revit via Autodesk Recap. The cloud appears as a 3D reference inside the model; modellers trace walls, floors, ceilings, structure, and MEP directly off the cloud at the agreed LOD.

A skilled BIM modeller produces around 200–400 sqm per day at LOD 200, dropping to 80–150 sqm per day at LOD 350.

Step 4 — QA and deviation report

Critical step that distinguishes good vendors from cheap ones. Every modelled element is automatically compared against the original point cloud, and a deviation report is generated. Target: < 25 mm tolerance.

Without a deviation report, you have no proof the model matches reality. Always require one.

Step 5 — Federated delivery

Final delivery is typically: native Revit (.rvt), IFC export, deviation report, and the original point cloud as a reference file. All linked through a shared coordinate system.

Accuracy you can expect

LOD 200 PC2BIM: ±25 mm — sufficient for scheme design.
LOD 300 PC2BIM: ±15 mm — sufficient for detailed design and clash detection.
LOD 350 PC2BIM: ±10 mm — sufficient for MEP coordination and shop drawings.
LOD 500 PC2BIM: ±5 mm — as-built record for handover, FM, and asset registration.

PC2BIM pricing in the UK (2026)

Per-day site scanning: £600–1,200 (depending on building size).
Modelling at LOD 200: £4–7 per sqm.
Modelling at LOD 300: £6–10 per sqm.
Modelling at LOD 350: £9–14 per sqm.
Modelling at LOD 500: £12–18 per sqm.
Most outsourcing partners offer a fixed-price quote once they see the cloud size and LOD spec.

Common PC2BIM mistakes to avoid

Specifying an LOD that is higher than the project actually needs — drives cost up without adding value.
Skipping the deviation report — leaves you unable to defend the model in disputes.
Using a vendor with no in-house surveyor — you lose the feedback loop between survey and model.
Not aligning to project coordinates — late-stage coordinate fixes are painful.
Ignoring point cloud density — too sparse and modelling is guesswork; too dense and Revit hangs.

How BIMLSS delivers PC2BIM

BIMLSS provides end-to-end PC2BIM services — UK site survey using Leica scanners, registration in Cyclone, and modelling in Revit at LOD 100–500. Every deliverable comes with a deviation report and federated IFC. We work directly with UK architects, engineers, and heritage consultants on listed buildings, commercial refurbishments, and industrial retrofits.

For a free PC2BIM quote on your project, email info@bimlss.com or visit www.bimlss.com.