Measured Building Surveys for BIM Managers: Scope, Outputs & Common Mistakes
For BIM managers, a measured building survey is not just a drawing — it is the foundation data for a BIM workflow. Getting the right survey scope, at the right LOD, with the right deliverables and coordinate system, is critical for your project's information management requirements.
This guide covers what a measured building survey should include for BIM projects, scan-to-BIM scope, ISO 19650 requirements, and the most common mistakes BIM managers make when commissioning surveys.
What a Measured Building Survey Captures for BIM
| Element | What Is Captured | | --- | --- | | Floor plans | Wall positions and thicknesses, doors, windows, structural columns, room layouts | | Elevations | Internal and external wall elevations, finishes, fixtures | | Sections | Floor-to-ceiling heights, floor levels, cross-sections | | Reflected ceiling plans | Ceiling heights, beams, lighting, HVAC diffusers | | Roof plans | Roof structure, parapets, details | | MEP services | Visible pipes, ducts, electrical conduits, service routes | | Structural elements | Beams, columns, load-bearing walls, foundations (visible) | | Fixed features | Staircases, built-in cabinetry, fire-stopping locations | | Point cloud | Raw 3D laser scan data (.E57, .RCS, .LAS) |
Deliverables: Revit LOD and Scan-to-BIM Scope
For BIM workflows, the survey typically produces a fully detailed digital 3D Revit model as the primary deliverable, with point cloud data as the raw source.
LOD (Level of Development) Guide
| LOD | Use Case | Detail Level | | --- | --- | --- | | LOD 200 | Feasibility and concept studies | General masses, approximate sizes and locations | | LOD 300 | Design, planning, and technical documentation | Exact size, shape, location, orientation; suitable for coordination | | LOD 350 | Coordination and clash detection | Includes connections, supports, hangers | | LOD 400 | Fabrication and specialist installation | Sufficient detail for fabrication and installation; full MEP routing | | LOD 500 | As-built and FM handover | Verified installed condition with metadata |
ISO 19650 and Level of Information Need (LOIN)
Under ISO 19650 in the UK, the contractual standard is Level of Information Need (LOIN) — not just LOD. Both must be clearly defined in your project requirements.
| ISO 19650 Concept | What It Means for Surveys | | --- | --- | | LOIN | Both graphical (LOD) and non-graphical (attributes, specifications) requirements | | EIR (Exchange Information Requirements) | Define deliverables, formats, LOD, LOIN before commissioning | | BEP (BIM Execution Plan) | Confirm supplier capabilities and delivery approach | | CDE (Common Data Environment) | Deliver via project CDE, not email |
Scan-to-BIM Checklist for UK BIM Managers
- [ ] Coordinate system: Georeferenced to Ordnance Survey National Grid plus site datum
- [ ] LOIN/LOD specification: Agreed geometry plus structured data (including hidden MEP)
- [ ] Deviation report: Point cloud vs. model comparison
- [ ] QA report: Registration accuracy and coverage confirmation
- [ ] Revit version: Confirm: 2023, 2024, or 2025
- [ ] IFC export: IFC 2x3 or 4.0 required
- [ ] COBie data: Asset data for FM handover — specify required fields
- [ ] Naming convention: Confirm against project BEP before instruction
- [ ] Point cloud formats: E57 (vendor-neutral) plus RCP (Revit-optimised)
- [ ] Discipline modelling: Architectural, structural, MEP modelled separately or combined
Common Mistakes BIM Managers Make When Commissioning Surveys
Mistake 1: Not Specifying LOD Clearly in the EIR
Consequence: Survey delivered at the wrong level of detail — re-scanning or re-modelling required.
Fix: Define LOD explicitly in the EIR before sending to market. Include graphic requirements (what elements are modelled) and information requirements (what data is attached to each element).
Mistake 2: Forgetting to Specify the LOIN (Not Just LOD)
Consequence: Model delivered with geometry but no attributes — does not meet FM handover requirements.
Fix: ISO 19650 requires both LOD and LOIN. Specify non-graphical information requirements (room data, asset tags, material specifications) in the EIR alongside geometry requirements.
Mistake 3: Not Confirming Revit Version Compatibility
Consequence: Model created in an older Revit version — system families incompatible with your project file.
Fix: Specify the minimum Revit version in your brief. Confirm that the surveying company will deliver in your project's Revit version. Check system family compatibility before accepting deliverables.
Mistake 4: Missing COBie Requirements
Consequence: Model delivered without asset data — does not meet FM handover requirements.
Fix: Specify COBie requirements in the EIR: which fields are required, what data should be populated, which systems need asset tags. Without this specification, the surveying company will not include it.
Mistake 5: Not Agreeing a Naming Convention
Consequence: Model elements named differently from your project standard — re-naming required.
Fix: Agree a naming convention with the surveying company before instruction. Align with your project's BEP. Include element categories, level prefixes, and room naming conventions.
Mistake 6: Accepting Deliverables Without QA
Consequence: Errors discovered during coordination or construction.
Fix: Require a QA report with every delivery: registration accuracy, deviation report (point cloud vs. model), coverage map. Spot-check key dimensions against the point cloud before accepting.
Mistake 7: Not Specifying Coordinate System
Consequence: Model delivered in local coordinates that do not align with the project model.
Fix: Specify the coordinate system: OS National Grid or project grid. Confirm the survey will be georeferenced to match your project model. Include a control point schedule in your brief.
Mistake 8: Scope Ambiguity on MEP
Consequence: Model delivered without MEP — re-scanning required.
Fix: Specify MEP scope explicitly: which MEP systems are included, what level of detail is required for each system, whether above-ceiling void is captured.
What to Include in Your BIM Survey Brief
- [ ] Purpose: Asset management, design coordination, FM handover, or planning
- [ ] Scope: Which buildings, floors, zones, and MEP systems are included
- [ ] LOD per discipline: Architectural LOD 300, structural LOD 300, MEP LOD 200–350
- [ ] LOIN requirements: Non-graphical information (attributes, room data, asset tags)
- [ ] Revit version: 2023, 2024, or 2025
- [ ] IFC export: IFC 2x3 or 4.0 required
- [ ] COBie data: Which fields and systems require COBie
- [ ] Point cloud formats: E57 (vendor-neutral) plus RCP (Revit-optimised)
- [ ] Coordinate system: OS National Grid or project grid
- [ ] Naming convention: Confirmed against project BEP
- [ ] QA requirements: Deviation report, registration accuracy, coverage map
- [ ] CDE delivery: Via project Common Data Environment
- [ ] ISO 19650 compliance: Confirm alignment with project EIR
2025 UK Costs for BIM Managers
| Service | Price Range (ex VAT) | Notes | | --- | --- | --- | | Measured building survey | £495–£1,400 (small); £1,500–£5,000+ (large) | Survey + CAD drawings | | Scan-to-BIM LOD 200 | ~£0.30–£0.60/sq ft | Coordination level | | Scan-to-BIM LOD 300 | ~£0.40–£0.80/sq ft | Design level | | Scan-to-BIM LOD 350 | ~£0.60–£1.00/sq ft | MEP coordination | | Scan-to-BIM LOD 400 | ~£0.60–£1.10/sq ft | Fabrication level | | MEP modelling add-on | +£0.15–£0.30/sq ft | Separate MEP disciplines | | COBie data | From £500 | Per system or per floor |
Frequently Asked Questions
Q: What is the difference between LOD and LOIN?
LOD (Level of Detail) refers to the graphical representation — how much geometry detail is modelled. LOIN (Level of Information Need) under ISO 19650 refers to both graphical and non-graphical requirements — geometry plus attributes, specifications, and metadata. Always specify both.
Q: What LOD do I need for planning vs. detailed design?
For planning applications: LOD 200 is typically sufficient. For building regulations and detailed design: LOD 300. For technical coordination and construction documentation: LOD 350. For fabrication and FM handover: LOD 400–500.
Q: How do I verify the BIM model against the point cloud?
Request a deviation report: a comparison between the point cloud and the BIM model showing areas where the model deviates from the scan data. This is a standard QA deliverable for scan-to-BIM projects.
Q: Can I get a BIM model without a point cloud?
Scan-to-BIM requires a point cloud as the source data. The surveying company scans the building, processes the point cloud, and then models from it. You cannot get a BIM model without the scan data.
Q: What Revit families should I expect in a scan-to-BIM model?
Standard families: walls, floors, ceilings, roofs, doors, windows, stairs, ramps, columns, beams. MEP families: ducts, pipes, cable trays, equipment. Custom families may be needed for unusual features.
Q: How do I confirm BIM deliverables against ISO 19650?
Use the EIR as your reference document. Verify deliverables against the EIR's LOIN requirements: graphic requirements (LOD), non-graphic requirements (attributes), and delivery format (Revit version, IFC version, COBie data). The BEP should confirm the supplier's approach to meeting these requirements.
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