See3D is a London-based LiDAR scanning company, and scan to BIM commissions — turning laser scans of existing buildings into Building Information Models — are an increasingly large share of what we capture. If your architect, contractor or facilities team has asked for a BIM model of an existing building, this guide explains what scan to BIM means, how the workflow actually runs, what level of detail to specify, and what the deliverables should include on a UK project.
What is scan to BIM? The point cloud to BIM model workflow explained
Scan to BIM — also written scan-to-BIM — is the reality capture process of laser scanning an existing building and using the resulting point cloud to build an accurate, intelligent 3D BIM model in modelling software — almost always Autodesk Revit in the UK market. The scan captures the building's real-world geometry as millions of measured points; the modelling stage converts that raw data into structured building elements: walls, floors, roofs, windows, doors, structure and MEP services.
The distinction from ordinary 3D modelling is the word "information". A BIM model isn't just shapes — each element carries data about what it is, what it's made of, and how it relates to the rest of the building. That makes the model useful across the whole project lifecycle: design, coordination, construction and eventual facility management.
The distinction from CAD matters too. 2D CAD drawings describe a building in flat, disconnected sheets. A building information model is a single, coordinated digital model from which drawings, schedules and quantities are generated — change the model and every output updates. For existing buildings, scan to BIM is how you get that model without guessing: the point cloud anchors every modelled element to measured reality.
When does a project need scan to BIM?
Scan to BIM earns its cost wherever an existing building meets a significant design or management decision:
- Renovation and refurbishment — designing within an accurate digital version of the existing structure, rather than discovering on site that the riser is 300 mm from where the archive drawings showed it
- Retrofit and energy upgrades — reliable existing-conditions geometry for fabric and services interventions
- Heritage and preservation projects — a precise record of complex, irregular fabric that manual surveying captures poorly
- MEP coordination — modelling what's genuinely in the ceiling voids and risers so new services can be clash-checked against reality
- Facility management — handing operations teams a digital twin they can query, measure and update for the life of the asset
- Construction verification — comparing as-built conditions against design intent at key construction phases
If your project only needs 2D floor plans, a full BIM model is overkill — a measured building survey is the right commission. If it needs an intelligent model your whole team can coordinate within, scan to BIM is the workflow that produces it.
How does the scan-to-BIM workflow run from building to building information model?
A typical scan to BIM project runs through five stages — and the same scan-to-BIM process applies whether the subject is a plant room or a campus:
1. Scope and LOD specification
Before anyone scans anything, the deliverable is defined: which parts of the building, which disciplines (architecture, structure, MEP), and to what level of detail. This is the single most important conversation in the project — it drives cost more than any other factor, and getting it wrong produces a model that's either inadequate or needlessly expensive.
2. 3D laser scanning on site
The building is captured with a laser scanner from multiple positions, producing overlapping scans that record everything in view as measured points. We scan with the Realsee Galois M2, which captures the point cloud and 134-megapixel panoramic imagery at every setup — the photography becomes invaluable at the modelling stage, when a modeller needs to identify whether that shape in the cloud is a conduit or a cable tray.
3. Point cloud registration
The individual scans are aligned into one continuous, accurate dataset — the registered point cloud — and quality-checked. The processed point cloud file with its point cloud data is typically delivered in E57 or RCP format. This stage is covered in more depth in our guide to point cloud surveys.
4. Modelling in Revit
The processed point cloud is imported into Autodesk ReCap and referenced into Revit, where the modelling team builds the BIM elements over the cloud — tracing walls, floors, structure and services at the agreed level of detail. Where the building contains repeated non-standard components, custom Revit families are built to match. This is the labour-intensive stage: on most projects, modelling time exceeds scanning time several times over.
5. QA and deliverable handover
The finished model is checked against the point cloud for dimensional fidelity, then issued — usually as an RVT file, often alongside IFC for open-format exchange, plus the registered cloud and any 2D drawing sheets generated from the model.
What does LOD mean in scan to BIM?
Level of detail (LOD) defines how much geometric and informational richness each modelled element carries. In the common US-derived framework used informally on UK projects:
- LOD 200 — approximate geometry: right element, right rough size and location. Suitable for early feasibility.
- LOD 300 — accurate geometry: precise size, shape and position. The standard for most design and coordination work.
- LOD 350 — LOD 300 plus interfaces with adjacent systems — the usual specification for MEP coordination.
- LOD 400/500 — fabrication-level or field-verified detail. Rarely justified for existing-condition models.
The honest advice: specify the lowest LOD that serves the use case, per discipline. An architecture model at LOD 300 with structure at LOD 200 and visible services at LOD 350 is a perfectly normal — and far cheaper — specification than "everything at LOD 350".
What Autodesk software is used in the BIM workflow?
The UK-standard toolchain for the modelling process is largely Autodesk software:
- Autodesk ReCap Pro — point cloud processing and indexing for use in Revit and AutoCAD
- Autodesk Revit — the BIM authoring platform where the model is built; deliverables issue as RVT
- Navisworks and Autodesk Construction Cloud — model review, coordination and clash analysis software across disciplines and project stakeholders
- AutoCAD — 2D outputs where the project still needs sheet drawings
- IFC export — open-format delivery so non-Autodesk consultants can use the model
Clients don't need to own any of this to commission scan to BIM — you specify the deliverable and receive the files. But it's worth confirming your design team's Revit version before modelling starts, because Revit files don't save backwards.
What are the benefits of scan to BIM?
- Accurate as-built geometry you can build on. Scan to BIM creates as-built models anchored to millimetre-grade measured data, not archive drawings or assumption — an accurate BIM baseline for design and construction.
- A single source of truth. Design, coordination, quantities and drawings all flow from one coordinated building information model — discrepancies surface in the model, not on site, which streamlines work for every stakeholder in the AEC chain.
- Fewer surprises, fewer revisits. The point cloud captures everything in view, so questions that arise months later are answered from the data rather than another site visit.
- Better coordination. New design work is clash-checked against existing conditions before contractors price it — the cheapest possible time to find a problem.
- Lifecycle value. The model outlives the project: facilities teams inherit a queryable digital twin rather than a drawing archive, which pairs naturally with virtual tours for O&M manuals.
What are the common challenges in scan to BIM projects?
Honesty serves better than salesmanship here:
- Scope creep at the modelling stage. "While you're in there, could you also model…" is how budgets die. Fix the LOD specification before modelling starts and change-control additions.
- Occlusion. Scanners record what they can see. Furniture, stored goods and ceiling tiles hide geometry; either the site is prepared, accessible voids are opened, or the model carries documented assumptions.
- Old buildings resist neat categories. A bowed 1860s wall isn't a standard Revit wall type. Decide early whether the model should reflect true deformation (costlier, sometimes necessary for heritage) or idealised geometry (cheaper, fine for most refurbishment).
- File size and hardware. Point clouds run to tens of gigabytes. Confirm your team's hardware and software can handle the dataset before it lands on them.
How much does scan to BIM cost in the UK?
Scan to BIM cost is driven by four variables: building size and complexity, the disciplines modelled, the specified LOD, and programme. As a structural rule of thumb, scanning is the smaller share and modelling the larger — which is why a tight LOD specification matters more than negotiating the scan rate.
Ways to keep cost proportionate:
- Specify LOD per discipline and per zone, not building-wide
- Model only the disciplines the project will coordinate
- Take the point cloud handover plus partial model rather than full-building BIM where the work is localised
- Combine the scan with other outputs — our capture produces survey data and a 16K virtual tour from the same visit, which spreads the site cost across marketing, planning and design uses
We quote scan to BIM per project with itemised scanning, registration and modelling stages. Get in touch with your building details and required LOD for a tailored figure. Scan data is typically delivered within 3–5 working days; modelling timelines depend on scope and are agreed up front.
Planning a scan to BIM project?
If you need an accurate Revit model of an existing building — for refurbishment, coordination or facilities — we capture survey-grade point clouds with 134-megapixel imagery in a single visit, handled personally, with scan data delivered in 3–5 working days.
Request a tailored quote →You can also explore our scanning services and see capture examples in our portfolio.