The UK BIM Mandate and the Skills Gap
Since 2016, the UK government has mandated Level 2 BIM (Building Information Modelling) for all public sector projects. Level 2 means coordinated, federated models across disciplines (architecture, MEP, structural) with clash detection and design reviews.
Reality: 45% of UK architecture and engineering practices lack dedicated BIM staff (BIM Task Group 2022 survey). The skills gap is acute. A BIM modeler with Revit expertise, coordination experience, and ISO 19650 knowledge commands £30,000–£40,000 annually. Adding BIM capability in-house takes 6–9 months of hiring and training.
Private sector projects increasingly demand BIM (client requirement, lender requirement for complex projects). Yet most mid-size practices cannot justify a full-time BIM hire. Outsourcing BIM modeling solves this: access to experienced modelers, full-time availability, and no hiring overhead.
What BIM Modelers Do: Families, LOD, Coordination
Revit Family Creation
Families are reusable parametric components (doors, windows, furniture, MEP fittings). Outsourced BIM modelers create custom families from specifications (client brand standards, specific manufacturers). Families are populated with object properties (cost, maintenance schedule, lifecycle data) for LOD 300–400 requirements. Turnaround: 3–5 days per family set.
Level of Detail (LOD) Specifications
BIM progression: LOD 100 (conceptual) → LOD 200 (schematic design) → LOD 300 (design development) → LOD 400 (detailed design) → LOD 500 (as-built). Outsourced modelers build models to client-specified LOD, ensuring efficiency (don't over-model in early phases) and completeness (detailed coordination in later phases).
Clash Detection and Resolution
Federated models (architecture, structure, MEP, systems) are imported into Navisworks for clash detection. Outsourced coordinators run automated clash reports, categorise clashes (hard=collision, soft=spacing), and propose resolutions. Coordination meetings: weekly clash reports reviewed, resolutions approved, models updated. Typical project: 50–200 clashes resolved per design phase.
Model Federation and Management
Coordinating discipline models requires proper linking (not embedding), file naming, shared coordinates, and work-sharing setup. Outsourced BIM team manages this infrastructure, ensuring all consultants' models link correctly. Includes Central Model management and user access protocols.
ISO 19650 and UK Standards Compliance
ISO 19650 Requirements
ISO 19650 is the UK standard for BIM information management. It mandates: information standards (naming conventions, properties, data structure), security protocols (access control, audit trails), and delivery workflows (information exchanges at project milestones). Outsourced BIM teams must comply with client's ISO 19650 implementation (usually defined in the EIR—Employer's Information Requirements).
BIM Task Group Standards
The UK BIM Task Group (government-mandated oversight body) publishes standards for model structure, object naming, and collaboration. Treba's BIM team follows these standards: model hierarchy (phase > building > level > zone > element), naming conventions (e.g., 'ARCH_WALL_EXT_BRICK' per Task Group guidance), and property tagging.
Information Delivery Specifications
Client defines required properties and metadata in BIM documents (COBie—Construction Operations Building information exchange). Outsourced BIM modelers populate Revit families with client-defined properties, ensuring compliance on delivery.
Tools: Revit, Navisworks, Solibri, and BIM 360/ACC
Revit (Modeling)
Industry standard for BIM in architecture and MEP. Treba modelers use Revit 2023–2024 with support for Autodesk's latest features (generative design, parametric schedules). Models are delivered as .rvt files with work-sharing setup if required.
Navisworks (Coordination)
Clash detection and 3D coordination. Treba coordinators import federated models into Navisworks, run automated clash reports, categorise, and propose resolutions. Reports are exported as .nwf files and PDF clash summaries.
Solibri (Model Auditing)
Automated quality control for BIM models. Solibri checks for: missing properties, geometry errors, design rule violations (e.g., door clearances). Treba uses Solibri for pre-delivery model audits to ensure quality.
BIM 360 / Autodesk Construction Cloud (ACC)
Cloud platform for model collaboration and change tracking. Treba can integrate models into your BIM 360/ACC workspace, enabling real-time updates and team reviews. Requires your Autodesk licensing.
Collaboration Workflows and Deployment
Typical BIM Workflow
Architect leads; Treba's BIM team supports coordination. Phase 1 (RIBA Stage 2): Architect sketches → Treba creates schematic massing model (LOD 100) in Revit. Phase 2 (RIBA Stage 3): Architect designs → Treba models architecture elements (walls, doors, windows) to LOD 200–250. MEP and structure consultants model in parallel. Phase 3 (RIBA Stage 4): Design development → Treba runs clash detection, coordinates resolutions, updates models to LOD 300.
File Management and Revision Control
Models are stored in a shared project folder (OneDrive, BIM 360, or project server). Naming convention: 'Project_Discipline_PhaseRevision.rvt' (e.g., 'Riverside_Arch_Stage3_Rev_B.rvt'). Weekly saves are archived; current version is clearly marked. Change logs are maintained in a shared register.
Real-time Coordination Meetings
Weekly (or bi-weekly) coordination calls with your team and consultants. Treba attends, presents clash reports, shows 3D visualisations, and discusses resolutions. Decisions are logged; model updates follow within 24–48 hours.
Cost Comparison: UK BIM Modelers vs Outsourced
Comparison
| Line Item | UK (London) | Treba (Nairobi) | Saving |
|---|---|---|---|
| Cost Category | UK BIM Modeler | Outsourced (Kenya) | Saving |
| Annual salary | £32,000–£40,000 | £10,200 | 68–75% |
| Professional development (Revit cert) | £1,500/year | Included | 100% |
| Pension and benefits | £6,000 | £0 | 100% |
| Software (Revit, Navisworks, Solibri) | £4,000–£6,000/year | Included | 100% |
| Project productivity | 1 mid-size project/year | 3–4 mid-size projects/year | 3–4x |
| Clash detection/coordination cycles | 2–3 per phase | 6–8 per phase | 2–3x faster |
| Total (practice, 2 projects/year) | £70,000 (1 FTE) | £10,200/mo fee | 75% cheaper |
A mid-size practice managing 2 concurrent BIM projects needs 1–2 UK BIM modelers (£64,000–£80,000 annually). Outsourcing both projects costs £10,200–£15,300/month (£122,400–£183,600/year, but with 3–4x productivity). Blended approach (architect leads BIM, Treba handles detailed modeling and coordination) is most practical: leverage senior architect's expertise, offload modelling burden to outsourced team.
Key takeaways
• 45% of UK practices lack dedicated BIM staff.
ISO 19650 mandates coordination on public projects; private clients increasingly demand it. • BIM modelers create Revit families, maintain LOD specifications, and run clash detection.
Outsourced team handles coordination across disciplines. • Tools: Revit (modeling), Navisworks (coordination), Solibri (QA).
All are standard in UK practice. • Outsourced BIM modelers integrate into your workflows: weekly coordination calls, shared file management, real-time model updates. • Cost: outsourced BIM team (£10,200/month) is 70% cheaper than UK hire (£32–40k salary) and delivers 3–4x the throughput.
Written by
Treba Research
Treba editorial team — expert analysis on outsourcing, compliance, and building distributed UK–Kenya teams.
