What does IFC mean in construction? Two meanings, one acronym
Updated · by the IFCfiles team
IFC has two meanings in construction. On drawings, specifications and
transmittals, IFC = Issued for Construction: the revision status that tells the
contractor "build from this". In BIM, IFC = Industry Foundation Classes: the
open, vendor-neutral file format (.ifc) used to exchange building models between
Revit, ArchiCAD, Tekla and everything else. They share three letters and nothing else — and
on a large project you will meet both in the same week.
This guide covers both — what each one means in practice, how to tell which one someone is talking about, and what to do when a ".ifc" lands in your inbox.
Meaning 1: IFC = Issued for Construction
"Issued for Construction" is a document status. It marks the point where a drawing, specification or model view has been reviewed, approved and released so the contractor can build from it. Before that point the same sheet has usually been through several other statuses; after it, any change needs a new revision, and the superseded IFC set is withdrawn from site.
The stamp normally appears in the revision block of the title block ("Rev C — Issued for Construction"), in the drawing register and on the transmittal that delivers the set. In document-control systems such as Aconex, Procore or Autodesk Construction Cloud it is a workflow state you can filter on.
Where it sits among the other stamps
The exact sequence varies by firm and country, but a typical drawing life cycle looks like this:
| Status | Stands for | What it allows |
|---|---|---|
| IFR / IFI | Issued for Review / Information | Comment only. Not for pricing, not for building. |
| IFA | Issued for Approval | Formal review by client, engineer or authority. |
| IFT / IFB | Issued for Tender / Bid | Pricing. Quantities may still move. |
| IFC | Issued for Construction | Build from this revision. |
| As-built / Record | — | What was actually built, for handover and FM. |
Two consequences follow. First, an IFC drawing is a contractual object: building from anything else — an IFA set, a marked-up PDF, a model view someone exported on Friday — is a classic source of claims. Second, "IFC" says nothing about the file type. An IFC-stamped set can be PDFs, DWGs, a Revit sheet set or a printed roll of A1s. The stamp travels with the revision, not with the format.
Meaning 2: IFC = Industry Foundation Classes
The other IFC is a file format and data schema for building information
models, developed by buildingSMART and standardised as ISO 16739. Where a Revit model lives in
a proprietary .rvt and an ArchiCAD model in a .pln, both can be
exported to .ifc — and that file can be opened by any software that speaks the
standard, today or in twenty years, with no licence for the original tool.
An IFC file carries far more than geometry. Every element declares what it is
(IfcWall, IfcDoor, IfcFlowSegment), where it sits in the
spatial hierarchy (site → building → storey → space), which property sets and quantities it
has (Pset_WallCommon.FireRating, Qto_WallBaseQuantities.NetVolume) and
how it relates to other elements — hosted by, contained in, part of a system. That structure
is what makes it usable for clash detection, quantity take-off, code checking and facility
management, not just viewing. The full anatomy is in our pillar guide,
What is an IFC file?
Versions you will actually meet
- IFC2x3 (2006) — still the most exchanged version, because every tool has supported it for years and many BIM execution plans mandate its Coordination View.
- IFC4 (2013) — better geometry, cleaner property definitions, the version to pick when you have a choice for buildings.
- IFC4x3 (2024) — extends the schema to roads, rail, bridges and ports.
The version is written in the file's own header
(FILE_SCHEMA(('IFC4'))). If you need to choose,
IFC2x3 vs IFC4 vs IFC4x3 walks through the trade-offs.
How to tell which IFC someone means
Nine times out of ten the context settles it in a second. When it does not, these clues do:
- It comes with a revision letter, a date and a transmittal ("IFC set, Rev 02, 14 Aug") → Issued for Construction. Document controllers, site engineers and QSs use it this way almost exclusively.
- It has a file extension ("send me the IFC", "the IFC is 180 MB", "the IFC won't open in Navisworks") → Industry Foundation Classes. BIM coordinators, modellers and anyone talking about software mean the format.
- It is paired with a schema or MVD ("IFC4 Reference View", "IFC2x3 CV2.0") → always the format.
- It is paired with another status ("still at IFA, IFC next week") → always the stamp.
The genuinely confusing sentence is "we need the IFC model" — which can mean the model in .ifc format or the model at Issued-for-Construction status. On projects that run both, teams tend to write the format in lowercase with the dot (".ifc file") and the status in caps with the word "set" or "status" (IFC set), or fall back on the ISO 19650 suitability codes (S0–S7, A1–An) so that status never has to be spelled with the same three letters. If your BEP does not already do this, it is a five-minute fix that saves an argument later.
You were sent an .ifc file — now what?
If the acronym reached you as an attachment, you almost certainly have the file format, and the practical question is what to do with it. Three steps cover most cases:
- Look at it. You do not need Revit or a licence for whatever exported it. Desktop viewers such as BIMvision, usBIM.viewer or Open IFC Viewer are free; a browser-based IFC viewer is faster still — drop the file in and it renders on your own machine without uploading anything, which matters when the model is confidential. The spatial tree and property panel usually answer "what is in here?" in a minute.
- Check it before you rely on it. Exports go wrong more often than people admit: missing storeys, geometry-less elements, dangling references. Running the file through an IFC validator gives you a readable report — and a paper trail if you have to send it back.
- Get the data out in the shape you need. A schedule for pricing or FM planning does not need a 3D scene at all: exporting IFC properties and quantities to Excel gives you one sheet per element class with every Pset and quantity as columns. For an editable model, see the honest walkthrough of converting IFC to Revit or DWG.
Other things IFC can stand for (briefly)
Outside these two, you may occasionally meet IFC as the International Finance Corporation (the World Bank's private-sector arm, relevant when it funds a construction project), the International Fire Code in US code references, or "Issued for Comment" in some document-control conventions. None of them are related to BIM files, and none are what people mean when they type "IFC" into a viewer.
In one line each
- Issued for Construction — a stamp on a drawing revision meaning "build from this". Applies to any file type. Owned by document control.
- Industry Foundation Classes — an open BIM file format (.ifc, ISO 16739) for exchanging models between software. Owned by buildingSMART. Opens in any IFC viewer, including this one.
If you remember only one thing: the format never implies the status, and the status never implies the format. A model can be exported to .ifc while still a work-in-progress draft, and an Issued-for-Construction set can contain no .ifc file at all.