Download: Scan-to-BIM Survey Specification (PDF)

The downloadable specification includes the full detail behind every stage of our process:

1. Scan-to-BIM Workflow

A full breakdown of our step-by-step methodology from briefing → scanning → registration → modelling → QA → delivery.

2. Laser Scanning Accuracy & Point Cloud Requirements

Covers scanning tolerances, point density, registration RMS values, georeferencing and noise reduction.

3. BIM Modelling Standards (BS 1192 / PAS 1192 / AEC UK)

Defines naming conventions, file structure, Revit setup, worksets, classification and metadata expectations.

4. LOD Definitions (LOD2 / LOD3 / LOD4)

Explains accuracy tolerances, what is included/excluded at each level, and which project types each LOD is suitable for.

5. Quality Assurance & Accuracy Verification

Outlines our ISO-aligned QA process, point cloud overlays, geometry checks, tolerance verification and model sign-off.

6. Survey Deliverables

Details all outputs: point clouds, RVT models, IFC, DWG, TruView, 2D drawings, schedules, metadata, meshes and more.

7. Data Formats & File Exchange Standards

Specifies the formats we provide (RCS/RCP, E57, IFC, NWC, DWG, PDF) and how they integrate into your BIM environment.

8. Client Input Requirements

A clear list of what we need from clients at project start to ensure accurate and efficient delivery.

The PDF version also contains additional diagrams, tables, accuracy statements, and workflow graphics that are not included on the website. It is fully editable online, so there is no need to print it.

The survey specification is valuable for:

Design Teams: To understand how the model is built and what level of accuracy they can rely on.

Contractors: For tendering, coordination, sequencing and clash detection.

Heritage Consultants: Where accuracy, documentation and consistency are critical.

Asset Owners: To ensure BIM models support future FM or renovation work.

BIM Managers: To verify compliance and ensure compatibility with wider project standards.

Survey Buyers & Clients: To evaluate scope, LOD, tolerance and QA requirements before commissioning a survey.

You can download the complete, detailed Survey Specification here:

Tower Surveys 3D Modelling – Scan-to-BIM Survey Specification (PDF)

This includes the full workflow diagrams, accuracy tables, LOD matrices, technical requirements and appendices.

Or Appendix only to fill out and return

If you require a customised version aligned to your BIM Execution Plan (BEP), project brief, or client standards, we can provide a tailored specification upon request.

You can use the specification to:

• Define survey scope for new projects
• Guide procurement or tender documentation
• Align expectations between surveyors and designers
• Ensure consistent accuracy across multiple buildings
• Support compliance with BS 1192 / PAS 1192 / ISO 19650
• Provide a benchmark for QA and deliverable acceptance
• Communicate requirements clearly to project stakeholders

This document provides transparency and assurance across the entire Scan-to-BIM process.

We can review your drawings, BIM requirements and scope of work to recommend:

• Appropriate LOD (2/3/4)
• Survey coverage
• Accuracy requirements
• Deliverables
• Timescales
• File formats
• Constraints and risks

Contact us today for a tailored quotation or technical consultation.

Tel: 07731 747329
Tel: 07928 653296
Email: info@towersurveys3d.co.uk