Point Cloud to Revit Model in Harrow, London
Point cloud to Revit modelling — commonly called Scan to BIM — converts 3D laser scan point cloud data into an intelligent Revit BIM model of an existing building. The workflow captures millions of precise measurement points (accurate to ±3–5mm), then models walls, floors, structure, and MEP services into a coordinated Revit model for refurbishment, extension, or coordination work. In Harrow, local surveyors and UK-wide providers deliver these services for properties across Stanmore, Pinner, Northwood, Ruislip, and Harrow on the Hill. This guide explains what the process involves, the LOD levels, typical costs in 2025, and how to commission a point cloud to Revit model in Harrow.
What Is Scan to BIM?
| What It Is | Description | | --- | --- | | Point cloud | A dense collection of 3D data points captured by a laser scanner — millions of X, Y, Z coordinates with colour data | | Revit model | An intelligent 3D building information model built in Autodesk Revit with walls, floors, doors, windows, and MEP systems | | Scan to BIM | The process of converting the raw point cloud into a usable, structured BIM model |
The result is a digital twin of the existing building that architects, structural engineers, and MEP consultants can use for design development, clash detection, and as-built documentation.
What Is Involved: The Workflow
| Step | Description | | --- | --- | | 1. Laser scanning | Surveyors visit the Harrow site with terrestrial 3D laser scanners (FARO, Leica, Trimble) to capture millions of data points | | 2. Point cloud registration | Scans are aligned, cleaned, and georeferenced to OS datum or project grid using software like FARO Scene or Cyclone | | 3. Revit modelling | Elements are traced and modelled from the point cloud to the LOD, using Revit families categorised by discipline — architectural, structural, and MEP | | 4. QA and deviation check | Model is checked against the point cloud — deviation reports highlight areas outside tolerance (typically ±5–15mm) | | 5. Delivery | Revit model, point cloud, drawings, and reports are delivered in agreed formats |
Why Choose Scan to BIM in Harrow?
| Benefit | Why It Matters | | --- | --- | | Faster design development | Architects can begin design immediately from the accurate as-built model | | Reduced site re-measures | Full point cloud data — no return visits to check dimensions | | Clash detection | MEP systems modelled against structure — conflicts found before construction | | Accurate areas and volumes | GIA, NIA, and volumes extracted directly from the model | | As-built documentation | Client receives a permanent digital record of the existing building | | Harrow-specific expertise | Local surveyors understand Harrow's housing stock — semi-detached houses, Edwardian terraces, 1930s homes |
LOD Levels Explained
LOD (Level of Detail) defines how much detail is modelled in the Revit output. Higher LOD means more detail, more time, and higher cost.
| LOD | Best For | Accuracy | Cost Level | Detail Included | | --- | --- | --- | --- | --- | | LOD 100 | Concept design, feasibility | Low | £ | Basic massing, approximate form | | LOD 200 | General layout, initial coordination | Medium | ££ | Approximate positions and sizes, recognisable components | | LOD 300 | Detailed design, coordination, tender drawings (most common) | High | £££ | Accurate geometry, true positions, measurable components | | LOD 350 | Coordination and clash detection (plant rooms, risers) | High | ££££ | Interfaces, connections, clearances | | LOD 400 | Fabrication, specialist installation | Very high | ££££ | Fully accurate components, fittings, exact connections |
Most projects require LOD 300. LOD 400 takes three to four times longer and costs significantly more.
What Can Be Modelled in Revit?
| Element | Detail Level | | --- | --- | | Walls | Dimensions, thickness, layers, finish materials | | Floors | Structural slab, floor finishes, ceiling void | | Doors and windows | Frames, ironmongery, glazing, dimensions from point cloud | | Staircases | Full geometry from point cloud including balustrades | | Ceilings | Soffit levels, bulkheads, service penetrations | | Structural elements | Beams, columns, load-bearing walls | | MEP systems | HVAC, electrical, plumbing — if included in scope | | Roof structures | Trusses, flat roof details, parapets |
Deliverables
| Deliverable | Format | Purpose | | --- | --- | --- | | Revit model | .rvt | Primary deliverable for design development | | IFC export | .ifc | Platform-agnostic — works with all BIM software | | CAD drawings | .dwg | 2D floor plans, sections, elevations for contractors | | Point cloud | .e57, .rcp | Full digital archive for future use | | Deviation report | PDF | Confirms model accuracy vs. point cloud | | Registration report | PDF | Documents scanning methodology and accuracy | | Area schedule | Excel, PDF | GIA, NIA per RICS Property Measurement (2nd edition) |
Harrow-Specific Considerations
| Factor | Why It Matters | | --- | --- | | Semi-detached and Edwardian housing stock | Common in Harrow — often complex room layouts and original features | | 1930s homes | Typical in Stanmore, Pinner, Northwood — simpler geometry but still requires accuracy | | Green Belt areas | Parts of Harrow are in Green Belt — planning restrictions affect what can be modelled and designed | | Period features | Cornicing, fireplaces, original staircases — often modelled at LOD 300+ | | Commercial properties | Harrow's shopping parades and office buildings — larger scope, more complex MEP | | Large plots | Harrow's generous plot sizes often allow for significant extensions and refurbishments |
2025 Costs in Harrow and London
| Service | Typical Starting Price (ex VAT) | | --- | --- | | Point cloud survey only (no modelling) | £350–£495 + VAT for small to standard London project | | Single-discipline model, LOD 200 | £1,499+ | | Design-ready model (arch + structural), LOD 300 | £1,799+ | | Full architectural + structural + MEP, LOD 350 | Higher — quoted per project | | Minimum project fee | From £1,499–£2,500 | | Typical Harrow house (LOD 300) | £2,500–£5,000 | | Commercial unit (LOD 300) | £3,000–£15,000+ | | Deviation report | £300–£800 | | Point cloud only | £800–£2,000 |
Cost factors: Building size, complexity, accessibility, LOD required, MEP scope, and turnaround time.
Frequently Asked Questions
Q: What is the accuracy of a point cloud to Revit model?
Point cloud to Revit modelling achieves ±3–15mm accuracy depending on scan quality, point cloud density, and the detail level required. The deviation report — comparing the model to the point cloud — confirms that the model is within the specified tolerance.
Q: How long does point cloud to Revit modelling take?
For a typical Harrow house: 2–4 hours on site for scanning, 2–3 weeks for modelling. For a commercial building: 1–3 days on site, 4–8 weeks for modelling depending on complexity. Urgent turnaround is available at a premium.
Q: What LOD do I need for planning applications in Harrow?
For planning applications in Harrow, LOD 200–300 is typically sufficient. LOD 300 is preferred because it provides accurate dimensions for floor area calculations and design drawings. Check with Harrow's planning department for specific requirements on larger projects.
Q: Can MEP systems be modelled from the point cloud?
Yes — MEP systems (HVAC, electrical, plumbing) can be modelled from the point cloud if they are visible and accessible during the scan. Hidden services (within walls, under floors) cannot be modelled without additional investigation.
Q: What is the difference between IFC and RVT?
.RVT is the native Autodesk Revit file format — it preserves parametric families, parameters, and intelligence. .IFC (Industry Foundation Classes) is an open, platform-agnostic BIM format that can be opened in ArchiCAD, Vectorworks, and other BIM software. For most projects, both formats are delivered.
Q: Can I use the point cloud for future projects?
Yes — the point cloud is a permanent archive of the property at the time of survey. It can be re-measured, re-modelled at a higher LOD, or used for future extensions without returning to site. This is one of the most valuable benefits of commissioning a scan.
Q: Do I need a scan or can my architect measure by hand?
For simple properties, a measured survey may be sufficient. For complex buildings, buildings with development potential, or where MEP coordination is required, Scan to BIM provides significantly more value — complete data coverage, re-usable point cloud, and clash detection before construction begins.