BIM for scaffolding: what it means in practice

Why does BIM reach the scaffolding contractor?

Building information modelling is a way of working in which everyone on a project shares one set of digital models and the information attached to them. Most of that work is about the permanent building. The scaffold enters the picture for three practical reasons.

• Coordination. The main contractor wants to know where the scaffold stands before cranes, hoists, deliveries and window installation are planned around it.
• Clashes. Balconies, eaves, canopies, pipework and the tower crane all compete for the space the scaffold needs. A model shows the conflicts before the lorry arrives.
• Quantities and sequence. A scaffold model gives areas, loads on the ground and a build sequence that can be tied to the programme.

For the scaffolding firm the job is usually narrow: read the building model, design the scaffold against it, and hand back a model and a parts list in a form the project can open.

What is IFC, and why does everyone ask for it?

IFC, the Industry Foundation Classes, is the open, vendor-neutral data model that buildingSMART maintains for exchanging building information between programs (buildingSMART, IFC). Its current version, IFC 4.3, was approved by ISO as a final standard (buildingSMART announcement) and is published as ISO 16739-1:2024, in the UK as BS EN ISO 16739-1:2024 (BSI). IFC 4.3 extends the schema to infrastructure, with road, railway, bridges and ports and waterways, which matters for scaffolds on bridges and rail work.

In practice, an IFC file is how a Revit, ArchiCAD or Tekla model reaches a scaffold designer who uses something else. Its companion is BCF, the BIM Collaboration Format, which carries comments and clash issues between programs without sending the whole model again. NTI's Revit-based scaffold planner, for example, advertises support for both IFC and BCF (NTI SCAFFPLANNER).

What does ISO 19650 ask of a scaffolding firm?

ISO 19650 is the international series for managing information over the life of a built asset using BIM. Part 1 sets out the concepts and principles (ISO 19650-1). The UK's information management framework, the IMI Framework (formerly the UK BIM Framework), lists the parts a project may ask you to conform to (IMI Framework, standards):

For a scaffolding subcontractor, part 2 is the relevant one, because it covers the delivery phase, the period in which the scaffold is actually on site. In practice the project's information requirements and execution plan, written for that phase, tell you what to send, in which format, by when and where it is stored. Part 6 is worth knowing for scaffolding in particular because it deals with health and safety information. Part 6, ISO 19650-6:2025, superseded PAS 1192-6:2018 as the key standard for managing that information over the project and asset life cycle (BSI, ISO 19650-6:2025). A scaffold is both a hazard and a control measure, so it belongs in that information.

What level of detail does a scaffold model need?

LOD is often read as level of detail, but the BIMForum specification uses it as level of development: how far the geometry and information can be relied on, not how pretty the model looks (BIMForum LOD Specification 2023). ISO 19650 itself uses a different term, *level of information need*, defined in ISO 7817-1:2024 (published June 2024; EN ISO 7817-1 superseded EN 17412-1:2020) (BSI, ISO 7817-1:2024). On a project run under ISO 19650, expect the request in that language, even if the brief still says LOD. The BIMForum fundamental definitions, which follow the AIA's 2022 contract language, are:

One detail is worth knowing. The 2023 specification lists suspended and powered scaffolding only "when part of the completed project", in other words permanent access equipment. A temporary facade scaffold has no element entry of its own, so the level of development for it has to be agreed in the project's information requirements or execution plan. If nobody writes it down, ask before you model.

What does a scaffold clash with?

Clash detection compares two models and lists every place where they occupy the same space, or come closer than a set clearance. For scaffolds the usual suspects are:

• balconies, canopies and eaves that sit inside the scaffold line;
• tower crane slew zones and hoist masts;
• window and cladding installation that needs a working gap behind the decks;
• temporary roofs, loading bays and site roads at ground level.

Several scaffold programs handle this differently. Avontus Designer integrates designs with Autodesk Navisworks so they can sit inside the main contractor's BIM coordination model (Avontus). Layher's LayPLAN CAD offers visual conflict checks through realistic rendering inside AutoCAD (Layher). A SMART Scaffolder customer quoted on the vendor's site credits its 3D models with helping to spot potential clashes (SMART Estimator).

Which scaffold tools import or export IFC?

We checked each vendor's own page on 23 October 2026. "Not stated" means the page did not say, not that the feature is missing.

The pattern is clear: tools that live inside a BIM authoring program (NTI in Revit, ScaffPlan in Tekla) inherit that program's exchange; stand-alone scaffold tools import IFC to get the building in, and fewer of them say they send IFC back out. If a project's information requirements ask for an IFC scaffold model, check the export before you choose a tool. For a broader comparison of what these programs do, see what does scaffold software do, the scaffold design software overview and the scaffold software comparison.

Is a scaffold in a BIM model temporary works?

A scaffold in a BIM model looks like any other object, but legally it is temporary works. HSE lists scaffolds for access among the temporary works that must be planned and managed, says that in all but the simplest situations a design including calculations will be needed, and recommends appointing a temporary works coordinator to make sure designs are prepared, checked and correctly erected (HSE, temporary works). For tube and fitting and system scaffolds, HSE points to TG20 and the manufacturers' guidance as the standard configurations; outside them, a bespoke design is required (HSE, scaffolding).

Two consequences follow for a BIM workflow. First, a scaffold model at LOD 300 or 350 is a coordination object, not a design: the calculation sits with the scaffold designer, whatever the model shows. Second, the model must be updated when the scaffold is altered on site, or the coordination model starts to lie, which is exactly the problem the temporary works coordinator is there to prevent.

What if you are a small contractor without BIM software?

You can still take part. Ask for the architect's IFC file and a PDF set, open the IFC in a viewer to read heights and projections, and return your scaffold layout as a drawing with the parts list. Main contractors on smaller jobs often accept that. Reading the walls off a PDF or a scan is where AI tools are most often offered; AI in scaffold planning separates what works today from what is still a promise. Tools that turn wall dimensions or a PDF drawing into a scaffold plan, such as ScaFix, cover that route; ScaFix does not read or write IFC and is not a structural design tool; how we compute the parts lists explains what its engine does and does not check.

This is planning information, not structural approval. The manufacturer's instructions, TG20 or a bespoke design decide how the scaffold is built; in Great Britain the Work at Height Regulations 2005 and HSE's temporary works guidance apply, and a competent person must inspect the scaffold before use.

Frequently asked questions

Sources

Primary sources used for this article, with the date each was read.

• buildingSMART: Industry Foundation Classes (IFC) (read 23 October 2026)
• buildingSMART: IFC 4.3 approved as a final standard (ISO 16739-1:2024) (read 23 October 2026)
• BSI: BS EN ISO 16739-1:2024, Industry Foundation Classes (read 23 October 2026)
• ISO 19650-1:2018, Concepts and principles (read 23 October 2026)
• IMI Framework (formerly UK BIM Framework): Standards (read 23 October 2026)
• BSI: The role of BS EN ISO 19650-6:2025 (read 23 October 2026)
• BSI: ISO 7817-1:2024, Level of information need (read 23 October 2026)
• BIMForum: Level of Development Specification, Part I (2023) (read 23 October 2026)
• BIMForum: LOD Specification page (read 23 October 2026)
• Avontus Designer (read 23 October 2026)
• SMART Scaffolder: SMART Estimator (read 23 October 2026)
• Scaffcalc (read 23 October 2026)
• NTI: NTI SCAFFPLANNER (read 23 October 2026)
• ScaffPlan (read 23 October 2026)
• Layher: LayPLAN CAD (read 23 October 2026)
• HSE: Temporary works (read 23 October 2026)
• HSE: Scaffolding (read 23 October 2026)