What Is
LOD 350
in BIM?
A complete guide to Level of Development 350 — what it means, why US firms require it, and what it takes to deliver it.
What is LOD 350?
LOD 350 — Level of Development 350 — is a BIM standard defined by the BIMForum LOD Specification. It represents the level at which a building model element is developed enough for multi-discipline coordination. At LOD 350, every element in the model includes not just its own geometry and data, but also the interfaces, connections, and clearances with all adjacent building systems.
In practical terms: a wall at LOD 350 does not just exist in the model. It shows exactly how it connects to the structure above, how it interfaces with the MEP penetrations passing through it, and how its fire-rated assembly relates to adjacent elements. That level of precision is what makes a model ready for contractor coordination.
LOD 350 vs LOD 300 — The Difference That Matters
Most architects work at LOD 300. Most firms require LOD 350 on commercial projects. That gap — one step on the LOD scale — is what separates a $66K designer from a $103K BIM Coordinator. Here is exactly what changes:
| Element | At LOD 300 | At LOD 350 |
|---|---|---|
| Structural Beam | Size, material, location modeled accurately | All connections, bolts, plates, and clearances for adjacent systems included |
| Exterior Wall | Assembly layers, thickness, and material defined | Interface with floor slab, window frame, curtain wall anchor, and air barrier connection modeled |
| MEP Duct | Size, routing, and elevation shown | Hangers, supports, clearances, and coordination with structural penetrations modeled |
| Staircase | Geometry, handrail type, and dimensions accurate | All connections to landing slab, wall attachment details, and guard rail anchors included |
| Clash Detection | Geometric clashes detectable | Coordination-ready — all clearance requirements met, contractor can build from model |
Why US Firms Require LOD 350
LOD 350 became the contractual standard for commercial projects in the US for one reason: construction coordination. Before a contractor can build a $200M hospital or data center, every trade — architectural, structural, mechanical, electrical, plumbing — needs to coordinate in the model. That coordination only works at LOD 350.
Mandatory LOD 350 requirements appear in contracts for all federal projects over $1M, all VA healthcare construction, all NYC capital projects over $5M, and virtually all data center and hospital work with major US developers. If your firm is working at this level — or wants to — LOD 350 is not optional.
How to Learn LOD 350
There is no shortcut. LOD 350 is not a concept you can absorb from a YouTube video — it is a delivery standard that requires hands-on practice modeling real building elements to a coordination-ready level. The learning path has three stages:
Stage 1 — Understand the standard. Read the BIMForum LOD Specification for your relevant elements. Understand what "coordination-ready" means contractually. Know the difference between what you currently produce and what LOD 350 requires.
Stage 2 — Practice in Revit. Model each building element type — walls, floors, roofs, structural connections, MEP interfaces — at LOD 350. Produce BCF clash reports. Practice the coordination workflow in Navisworks.
Stage 3 — Deliver a complete LOD 350 project. Build and deliver a full project model at LOD 350, coordinated across disciplines. This is the portfolio piece and the practical proof of capability.
The AAS Revit BIM LOD 350 Mastery Course takes you through all three stages in 14+ hours of structured, project-based curriculum — the only USA-specific program built around this exact standard.
Ready to deliver at LOD 350?
AAS Revit BIM LOD 350 Mastery Course · $397 · Certificate Included · Lifetime Access