LOD 400 is fabrication-level BIM — every component specified to manufacturing precision, every connection detailed. It is the contractor's and fabricator's model, not the architect's. This article explains what LOD 400 contains, who owns it, and…
LOD 300 is the architect's deliverable — precise geometry, specific materials, and a coordinated model that construction documents can be produced from. This article explains what LOD 300 requires, where the line to LOD 400 sits,…
LOD 200 is the design development model — approximate geometry replaces massing, generic components appear, and coordination between disciplines begins. This article explains what LOD 200 requires, what it still excludes, and how it affects facade…
LOD 100 is the starting point in every BIM project — approximate massing without materials, supplier data, or precise dimensions. This article explains what belongs at LOD 100, what doesn't, and what happens when teams skip…
Light and air compliance depends on three metrics that all change with every facade iteration. WFR, WWR, and daylight values tracked manually in Revit become a recalculation problem — parametric families with formula-driven fields solve it
Revit curtain wall is built from two family types with different rules. System families control the grid; loadable families control the panels. Confusing them is the most common reason curtain wall workflows break in Revit
The spandrel/vision split is not just an aesthetic decision — it defines the curtain wall module and determines what the facade conceals. Getting zone heights right at LOD 100 prevents stack-up conflicts that compound into LOD…
No published standard fixes an architect's LOD target by phase — the BIM Execution Plan does. Here's the typical phase-by-phase breakdown, the cost of getting it wrong in either direction, and how LOD 100 through schematic…
The LOD 300-to-400 transition on a facade project is a formal handoff between architect and fabricator, not a linear escalation. Move too early and a single design revision can wipe a fabrication model mid-production
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