BIM Level of Development (LOD) is an industry-standard scale that defines how much geometry and reliable information each BIM model element contains at a given stage of a project. AIA defined the original levels, and BIMForum later added LOD 350 for coordinating trades. Despite the shared abbreviation, LOD is not Level of Detail: how much an element shows does not make it reliable enough to build from.
Although the level names come from design stages, LOD in BIM is assigned element by element in the LOD matrix of the BIM Execution Plan. The LOD scale has six levels, from conceptual design at LOD 100 to as-built records at LOD 500, and only elements developed to LOD 400 carry what fabrication needs. A clearly defined LOD leads to fewer on-site clashes, more accurate quantity take-off and cost estimates, and a measured as-built record for facility teams.
On Scan to BIM projects, the agreed level decides how fully each scanned element is developed in the model. The sections below then cover choosing that level within scan limits and cost, modeling each level in Revit, whether every project needs a defined LOD, and where Level of Information and BIM maturity levels fit. ViBIM’s Modeling Specification for Scan to BIM projects sets element requirements from LOD 100 to LOD 400, and three delivered ViBIM projects were modeled at LOD 200, 300, and 350.
What Is BIM LOD (Level of Development)?
BIM Level of Development (LOD) specifies how an element’s geometry and information develop from one project stage to the next, and it gives architects, engineers, and contractors a shared way to state how far each model element can be relied on at any point.
LOD stands for Level of Development, and in construction LOD means the level, from LOD 100 to LOD 500, that each model element has to reach before other trades build on it. Because every trade works to the same agreed level, LOD in BIM becomes a coordination tool across design, construction, and operations.
At LOD 200, a door is a generic placeholder that works for layout but not for ordering. At LOD 300, its measurable width and height, vision panel, and swing direction let the contractor coordinate the opening, and at LOD 400, its sill, frame trim, and assembly detail let the supplier fabricate and install it.
What Are the BIM LOD Standards From AIA and BIMForum?
The BIM LOD standards are the AIA G202-2013 Project BIM Protocol Form, which defines the core LOD levels, and the BIMForum Level of Development (LOD) Specification, which expands them element by element so project teams can specify model deliverables in a contract. The American Institute of Architects (AIA) first set out five levels, LOD 100, 200, 300, 400, and 500, in its E202-2008 BIM Protocol Exhibit, the predecessor of G202.
BIMForum then added LOD 350 between LOD 300 and LOD 400, bringing the scale to the six levels used today. The BIMForum LOD Specification is revised regularly, with the 2025 edition current, and ships as a definitions document plus an element-by-element spreadsheet organized by CSI Uniformat, an element-classification system. Alongside these LOD standards, the ISO 19650 series provides the information-management framework for BIM projects.
What Is the Difference Between Level of Detail and Level of Development?
The difference between BIM Level of Development and Level of Detail is that Level of Detail is an input, the amount of geometry and detail an element shows, while Level of Development is an output, how much of that geometry and its data you can actually rely on.
Level of Detail on its own describes how much visual and graphical richness a model element carries, how closely it looks like the real thing, and it can climb without the element becoming any more dependable. A manufacturer family downloaded online can look photorealistic yet still be only LOD 200, because its size and placement have not been verified against the real project, so its Level of Detail is high while its Level of Development stays low.
The two terms share the same abbreviation, which is why BIM levels of detail and levels of development are often used interchangeably. In contracts that adopt AIA or BIMForum terminology, however, “LOD” means Level of Development.
Does LOD Follow the Project’s Design Phases?
No, BIM Level of Development does not strictly follow a project’s design phases, because it grades how far each individual element can be trusted rather than marking which stage the whole project has reached, so one model can hold elements at several LODs at once. The level names borrow the language of design stages, such as conceptual, schematic, and detailed, because they track how developed an element is, not because they switch on for the whole model at a milestone.
LOD 100, 200, and 300 usually line up with conceptual, schematic, and detailed design, LOD 350 with construction coordination, LOD 400 with fabrication and assembly, and LOD 500 with as-built handover. After the schematic design phase, for example, many elements sit at LOD 200, yet some stay at LOD 100 and others are already modeled to LOD 300, each advanced only as far as its part of the project needs.
What Do the LOD Levels 100 to 500 Mean?
The BIM LOD levels 100 to 500 mean six levels of development, LOD 100, 200, 300, 350, 400, and 500, each setting the minimum requirements for the uses a model element can support, from design and cost estimation to coordination, fabrication, and facility management.
Each level builds on the one below it, adding the geometry, information, or field verification that the next use of the element depends on.
| Level and typical stage | What it defines |
|---|---|
| LOD 100Conceptual Design | Overall mass or symbol; properties are approximate |
| LOD 200Schematic Design | Approximate size, shape, and location |
| LOD 300Detailed Design | Specific, measurable size, shape, and location |
| LOD 350Construction Coordination | LOD 300 plus interfaces and connections |
| LOD 400Fabrication and Assembly | Fabrication, assembly, and installation detail |
| LOD 500As-Built | Field-verified geometry with stated accuracy |
LOD 100 (Conceptual Design)
LOD 100 in BIM represents an element at conceptual design, drawn as a generic symbol or mass that shows only that it exists. Approximate area, height, volume, location, or orientation can be derived from the overall model, but no specific element geometry is defined.
An LOD 100 element is reliable for massing and early area or volume studies, not for measurement or coordination. Cost at LOD 100 is a conceptual allowance, and a schedule built on it can show only overall duration and major phasing.
ViBIM's Modeling Specification, for example, marks LOD 100 as not applicable for beams, walls, floors, and stairs. In ViBIM's guidance for its Modeling Specification, most elements have no LOD 100, and LOD 100 is used only for the overall building mass.
LOD 200 (Schematic Design)
LOD 200 in BIM represents an element at schematic design, with approximate quantity, size, shape, location, and orientation. The geometry is generic and schematic, close enough for early spatial analysis and rough cost estimates, but not yet dimensionally accurate.
An LOD 200 element is reliable for schematic coordination and rough quantity take-off, not for exact dimensions. A typical use is a secondary or hidden element, such as a column behind a wall, modeled as a generic object at its approximate location.
At LOD 200, ViBIM's specification calls for primary beams, trusses, and columns at their overall size, and for walls and floors that show only their overall thickness. The same specification limits railings to the top rail and includes mechanical equipment only once it exceeds 20 in (500 mm) in two or more dimensions.
LOD 300 (Detailed Design)
LOD 300 in BIM represents a specific, detailed-design element whose quantity, size, shape, location, and orientation can be measured from the model. The element is sufficiently developed to convey design intent and support construction documentation and general object-level coordination.
An LOD 300 element is reliable for general coordination and accurate quantity take-off (QTO), but not yet for fabrication. LOD 300 is often enough for renovation work that does not involve prefabrication.
Moving up from LOD 200, beams and columns change from their overall size to their true profile shape. Typical LOD 300 requirements include secondary structure and stairs with accurate treads, risers, and stringers. ViBIM's specification lowers the mechanical-equipment threshold from 20 in (500 mm) at LOD 200 to 4 in (100 mm) at LOD 300.
LOD 350 (Construction Coordination)
LOD 350 in BIM represents an element whose interfaces with other building systems are modeled and measurable for construction-level coordination. On top of LOD 300 geometry, the element shows how it connects to adjacent or dependent elements across trades.
An LOD 350 element supports detailed multi-trade coordination and installation layout, but not yet shop fabrication. In Revit, teams model explicit connection components, hangers, and supports where the scope requires them. Pipe hangers, cable-tray supports, and beam clamps then show how exposed services relate to the surrounding structure.
LOD 400 (Fabrication and Assembly)
LOD 400 in BIM represents a specific element with the size, shape, location, quantity, and orientation of LOD 300 plus the detailing, fabrication, assembly, and installation information needed to build it. The element's geometry and information can support shop drawings, manufacturing, prefabrication, and installation planning.
An LOD 400 element supports fabrication, bills of materials, and spooling. Projects usually reserve LOD 400 for fabrication-critical items, such as plant equipment or industrial retrofits that need accurate spools.
Typical LOD 400 requirements include structural members with their bracing, supports, and connections, and floors that show the joists, blocking, and ribs of the floor build-up. Railings show detailed uprights and profiles, and ViBIM's specification drops the mechanical-equipment threshold to 2 in (50 mm).
LOD 500 (As-Built)
LOD 500 in BIM represents a field-verified, as-built element that serves facility management and operations after handover. The element's geometry has been established through observation, field verification, or interpolation, with its accuracy stated or attached.
An LOD 500 element supports as-built documentation as an observed record of installed conditions. Compared with LOD 400, LOD 500 adds no further geometric detail, and an LOD 500 element does not need fabrication content. A record model, for example, might state that walls and floors sit within 0.6 in (15 mm) of the laser scan used to verify them.
What Is the Difference Between LOD 300 and LOD 350?
The difference between LOD 300 and 350 is that LOD 300 defines an element on its own, while LOD 350 also defines how that element connects to everything around it. An LOD 300 pipe has the correct size and route; the same pipe at LOD 350 also shows its hangers, supports, and how it ties into nearby ducts.
The two levels differ in focus, interface requirements, Revit workflow, and best use.
| Feature | LOD 300 | LOD 350 |
|---|---|---|
| Primary focus | Element's own geometry | Element plus its connections |
| Interfaces with supports and hangers | Not required by the LOD 300 definition | Measurable and coordinated |
| Revit workflow | Measurable element geometry | Plus explicit interfaces and connections |
| Best used for | General coordination and QTO | Detailed cross-trade coordination |
What Are the Benefits of a Clearly Defined LOD in BIM?
The six benefits of a clearly defined LOD in BIM are improved collaboration, reduced risk and rework, minimized on-site clashes, improved cost and quantity accuracy, optimized modeling effort, and simplified facility management.
- Improves collaboration: The AIA G202 Model Element Table names the LOD and author of each element at each milestone, which leaves less ambiguity at every handoff.
- Reduces risk and rework: Once the LOD matrix in a BIM Execution Plan states the permitted use of each element, teams stop treating approximate LOD 200 geometry as construction-ready.
- Minimizes on-site clashes: Specifying LOD 350 where trades meet gets their connections coordinated in the model before installation begins.
- Improves cost and quantity accuracy: In 5D, the cost layer of the BIM dimensions, estimators price each element at the precision its LOD allows, so LOD 300 quantities need less contingency than LOD 200 quantities.
- Optimizes modeling effort: Assigning LOD by element keeps fabrication detail out of components that need only coordination, reducing modeling time and file weight.
- Simplifies facility management: Naming which elements must reach LOD 500 at handover leaves facility teams a measured record for locating equipment and planning changes without resurveying.
How Do You Choose the Right LOD for a Scan to BIM Project?
To choose the right LOD for a Scan to BIM project, set the level element by element according to the decision each model element must support (coordination, quantity take-off, fabrication, or facility handover), then confirm that the scan can support that level. Once the right LOD is set for each element, those choices become the project's LOD requirements, and when the modeling is outsourced, the same list becomes the provider's scope of work.
What LOD Can You Achieve from a Point Cloud Scan?
The LOD in BIM you can realistically reach on a Scan to BIM project depends on the scan itself, not only the level you request, because the source data limits what can be measured and verified. A registered terrestrial scan can support LOD 300 or higher where coverage, point density, visibility, and the agreed tolerance are sufficient. Handheld and mobile scanners such as the Leica BLK2GO capture a sparser point cloud and cannot guarantee LOD 300 for every element.
When a scan provider labels a Scan to BIM model by Level of Detail rather than Level of Development, the target LOD still decides what geometry and information each element must carry. Where the source cannot support the target, the options are supplementary measurements, a denser rescan, or a lower target LOD.
Is a Scan to BIM Model LOD 500?
No, a Scan to BIM model is not automatically LOD 500, because a laser scan records only the surfaces it can see, and LOD 500 requires each element assigned that level, seen or hidden, to have its accuracy established and stated. As-built BIM modeling scopes therefore list which elements need field verification before they can count as LOD 500. Pipes behind finishes and structure above ceilings are often modeled by interpolation, so they reach LOD 500 only after field verification or with a stated accuracy.
How Does LOD Affect Scan to BIM Cost?
LOD affects Scan to BIM cost because each higher level adds modeling and checking hours to every element at that level, making the LOD agreed per element one of the main drivers of the quote. Separately from the LOD, tightening the tolerance from 2 in (50 mm) toward 0.6 in (15 mm) adds checking time, and filling coverage gaps in the scan adds field or processing work, so both raise the Scan to BIM price.
How Do You Model LOD in Revit?
To model LOD in Revit, match each element's modeled accuracy to its target level, control how much of it shows through the view's Detail Level, and avoid modeling anything to a higher level than the project needs. Three steps keep LOD and view display separate.
- Develop and track the element separately: Use the system family, loadable family, or fabrication part that provides the required geometry and information. If the project's BIM Execution Plan (BEP) tracks LOD by parameter, add LOD as a shared parameter.
- Control display in the view properties: Change the view's Detail Level for display only; it does not change the LOD recorded in step 1.
- Verify the deliverable and stop at the agreed level: Check measurable geometry, information, interfaces, and source accuracy against the LOD matrix.
What Is LOD 300 in Revit?
LOD 300 in Revit means modeling each element with measurable quantity, size, shape, location, and orientation in the project's coordinate system, using a real system or loadable family rather than a placeholder. An LOD 300 wall, for example, uses a specific wall type whose compound structure lists its real core and finish layers.
What Is LOD 400 in Revit?
LOD 400 in Revit means modeling an element with the joints, brackets, connections, and assembly detail required for shop drawings and prefabrication, using suitable families or fabrication parts. Manufacturer specifications, sizes, and installation data are included when the project scope requires them. Some workflows develop existing design-intent families further, and others replace them with fabrication parts. The agreed deliverable determines which geometry and information must change.
What Is Level of Detail in Revit?
Level of Detail in Revit is the Detail Level view setting, Coarse, Medium, or Fine, that controls how much of each element a view draws, and it does not set the element's LOD. A wall set to Coarse can still be LOD 300 if its dimensions are accurate.
How Does ViBIM Deliver LOD on Scan to BIM Projects?
ViBIM sets the LOD for each deliverable, models every element only to the level the project relies on, and verifies it against the point cloud before handover. ViBIM quotes each scope against a stated LOD and, where the client sets one, a tolerance of 2 in (50 mm), 1.2 in (30 mm), 0.6 in (15 mm), or a custom value.
Since 2014, ViBIM has completed more than 1,000 projects and delivered 250,000 hours of Scan to BIM work. Every deliverable passes two independent QC layers, and 99% of projects are delivered on time. ViBIM teams deliver Revit 3D BIM modeling services and review each model in Navisworks Manage against project-specific US or UK requirements.
Three ViBIM Scan to BIM projects are listed below as BIM LOD examples.
- LOD 200, train station, Canada (72,000 sq ft / 6,700 m²): The architecture, structure, and terrain were modeled at LOD 200, while the railway track alignment was held within 0.4 in (10 mm).
- LOD 300, factory, US (40,900 sq ft / 3,800 m²): Dense MEP systems across six floors were modeled at LOD 300 and matched to the point cloud within 0.6 in (15 mm) for Navisworks coordination.
- LOD 350, aluminum extrusion press, US (16,150 sq ft / 1,500 m²): The press and its conveyor system were isolated from the surrounding plant and modeled at LOD 350, to a required accuracy of ±0.25 in (6 mm).
To scope a model at the right LOD, explore ViBIM's Point Cloud to BIM services or send drawings for a free trial. ViBIM returns quotes within 12 to 24 hours.
Is a Defined LOD Required for Every AEC Project?
No, a defined LOD is not required for every AEC project. A small or simple project may not need a formal LOD, but any project that relies on the model for coordination, fabrication, or handover benefits from agreeing one up front.
What Is the Difference Between LOD and LOI?
The difference between LOD and Level of Information (LOI) is that Level of Development states how reliably a model element, including its geometry and associated information, can be used, while LOI specifies its non-graphical data, such as manufacturer, model number, and maintenance record. Level of Detail describes the graphical input, and Level of Information in BIM describes the data input. A useful project shorthand is Level of Development = Level of Detail + Level of Information, although this is not a formal equation in the BIM standards and protocols.
ISO 7817-1:2024 covers both inputs under Level of Information Need, a framework that describes each information exchange in terms of geometrical information, alphanumerical information, and documentation. An LOD 300 pipe can have measurable size, shape, location, and orientation without carrying product or maintenance data. Adding the required specification, supplier, and maintenance fields increases its information content. Field verification at LOD 500 does not automatically supply that operational data, so facility-management handover must define both the observed geometry and the required information.
Is LOD the Same as a BIM Maturity Level?
No, LOD is not the same as a BIM maturity level, because a maturity level rates how advanced a project's whole BIM process is, and LOD rates how developed a single model element is.
The BIM maturity levels, Level 0 to Level 3, describe how a project shares and manages information, and a project at Level 2 can still hold elements at every LOD from 100 to 500.
References
- AIA Contract Documents, AIA G202-2013 Project BIM Protocol Form
- BIMForum, Level of Development (LOD) Specification
- ISO, ISO 7817-1:2024 Building information modelling – Level of information need – Part 1: Concepts and principles
