IFC Drawings: What Issued for Construction Means, and IFC vs IFA, IFB and Shop Drawings

IFC drawings are drawings Issued for Construction: the revision of each sheet that the design team has released for the contractor to build from. Every drawing goes through earlier statuses, typically issued for review, for approval and for bid, and only the IFC revision is meant to be used on site. In the US it is a convention printed in the title block or on a stamp, not a term defined by the standard AIA contracts. In the UK, ISO 19650 replaces it with status codes.

There is a second IFC in construction: Industry Foundation Classes, the open BIM file format. The two are unrelated, and this guide explains how to tell which one a document means. It also goes further than the usual definition in three places. It draws one IFC sheet with a real revision history, cut from a model our software generated. It maps the US letters to the ISO 19650 codes used in the UK. And it ends with a free drawing register template you can download.

What are IFC drawings?

An IFC drawing answers one question for everyone on site: may I build from this sheet? Drawings change constantly during design, and a project can have half a dozen revisions of the same floor plan in circulation. The status in the title block says which one is the instruction and which ones are history.

IFC drawing, definition: a drawing revision issued by the responsible designer with the status Issued for Construction, meaning that it is complete, coordinated and approved enough for the contractor and trades to build the work it shows. It supersedes every earlier revision of the same sheet, and is itself superseded when a later revision is issued.

Three things an IFC status does not mean, because each causes arguments on site:

1. It does not mean the drawing will not change. IFC means "build from this revision". When the design changes, the sheet is reissued with a new revision number, still as IFC.
2. It is not a defined contract term in the US. The AIA's design phases run schematic design, design development, construction documents, procurement and construction. The contract binds the parties to the Contract Documents, and "issued for construction" is the industry's way of labelling which revision of those documents is current. What matters legally is what the contract says the documents are.
3. It is not a permit. Plans approved by the building department and plans issued for construction are often the same revision, but not always. A US set may also be issued as a conformed set, which folds bid-period addenda into the drawings, before or instead of a sheet-by-sheet IFC issue.

Who issues them: the designer responsible for each discipline. The architect issues architectural sheets, the structural engineer structural ones, and so on. On design-build, EPC and industrial projects, the contractor's own engineering team often issues IFC drawings. The trade contractors then produce shop drawings from them.

The two IFCs: Issued for Construction vs Industry Foundation Classes

Search for "IFC" in a construction context and you will find two meanings, often on the same project:

The rule of thumb: if the sentence mentions sheets, revisions, stamps or "the set", it means Issued for Construction. If it mentions a model, an export, a viewer or a schema version such as IFC2x3 or IFC4, it means Industry Foundation Classes. The two even meet: the drawings in an IFC set are often cut from a BIM model that is also exchanged as an .ifc file. Our guide to the IFC file format covers the second meaning in depth, and our free IFC viewer opens one in the browser.

The drawing status ladder: IFR, IFA, IFB, IFC and after

IFC is one rung of a ladder of issue statuses. The letters below are the common US and international conventions; no single standard defines them, so every project should list its own in the BIM execution plan or the drawing register.

US issue statuses next to the UK National Annex codes for the same milestones. Only the highlighted column is meant to be built from.

Two practical notes. First, some firms combine stages, for example issuing a set "for permit and construction" when the permit comes back without changes. Second, the status belongs to each sheet, not to the whole project. On fast-track jobs the foundations can be IFC while the roof is still IFA, which is exactly why the register matters.

What is in an IFC set

An IFC set is every sheet issued for construction at one time, read together with the specifications. For a building, it typically contains:

• General sheets: cover sheet with the drawing index, general notes, abbreviations, symbols and code information.
• Civil and landscape: site plan, grading, utilities, planting.
• Architectural: plans, elevations, sections, reflected ceiling plans, enlarged plans, details, door, window and finish schedules.
• Structural: foundation and framing plans, sections, connection details, general structural notes.
• MEP and fire protection: mechanical, electrical, plumbing and sprinkler layouts, risers, schedules.
• The specifications, which govern materials and workmanship. Where they conflict with the drawings, the contract's order of precedence decides which wins.

A cover sheet headed "Issue for construction" with its drawing index, grouped by series: general sheets, plans, elevations, sections and details. Reference: House Construction Drawing Set by Ar. Abdul Rehman on Behance.

Every sheet in the set carries the same furniture, and that furniture is what makes it an IFC drawing rather than just a drawing. Here is one sheet, drawn from a real model:

The plan is a true cut through an IFC4 model our software generated. The title block, revision history and clouded change are illustrations of the convention, not a real project.

What to read on the sheet, top to bottom of the title block:

1. Project and sheet title. Obvious, but sheets from another project or phase do turn up in site cabins.
2. Revision table. A line for every issue, with the date and purpose. Here the letters A to C were pre-construction issues, revision 0 was the first IFC issue, and revision 1 is a change made after it. Lettering before IFC and numbering from 0 at IFC is a common convention, especially on industrial and infrastructure projects, but not a universal one. Many firms simply number every issue 1, 2, 3.
3. Status. A stamp or status box that says IFC. It should agree with the latest line of the revision table; when it does not, ask before building.
4. Seal and signature. Where the law or the contract requires a licensed architect's or engineer's seal, an unsealed sheet is not a valid construction document, whatever it says on the stamp.
5. Sheet number and current revision. "A-101 Rev 1" is what goes in the register, in RFIs and in site instructions.

IFC drawings vs shop drawings, as-built and record drawings

These four get confused more than any other construction documents, because they can show the same wall:

The shop drawing distinction has a contractual edge. The AIA's general conditions (A201-2017, § 3.12) define shop drawings as "drawings, diagrams, schedules, and other data specially prepared for the Work" by the contractor or a subcontractor, and state that shop drawings, product data and samples "are not Contract Documents." They show how the contractor proposes to meet the IFC drawings; they do not change them. If a shop drawing deviates from the IFC set, the deviation has to be flagged and approved separately.

A shop drawing: every cabinet module dimensioned and specified for fabrication. It would be prepared from the IFC interior drawings and returned to the designer for review. Reference: Kitchen Shop Drawing by Dena Mustafa on Behance.

As-built and record drawings close the loop at the other end. Increasingly they are produced from a laser scan of the finished building rather than from paper mark-ups alone, which is the scan-to-BIM workflow:

A point cloud of an existing house, the raw material for as-built drawings that record what is really there. Reference: Single-Family As-Builts, Berkeley Project by Alterpex on Behance.

How IFC drawings are revised after issue

Issuing a set for construction starts a new kind of change control, not the end of it. Ground conditions, RFIs, owner changes, code comments and coordination clashes all lead to revised sheets. The mechanics are standard:

1. An instruction authorises the change. In the AIA family that is an Architect's Supplemental Instruction (G710) for minor changes with no cost or time impact, a Change Order (G701) when cost or time is agreed, or a Construction Change Directive (G714) when they are not. An answered RFI can also lead to a revision.
2. The affected sheets are reissued with the next revision number, still with the IFC status.
3. The change is clouded on the sheet and tagged with a delta carrying the revision number, so the site team can find it without comparing two plans line by line.
4. The revision table gets a new line describing the change, and the register is updated with the new current revision and the transmittal it went out on.
5. Superseded prints are withdrawn. Building from a superseded revision is one of the most common and most avoidable causes of rework.

A sheet after several rounds of comments: every change clouded in red and tagged with a delta, and the revision table listing permit, city comments and owner comments. Reference: Building Conversion for Birdcall Richardson by Drafinity LLC on Behance.

A convention worth adopting: clouds from older revisions are removed when a new revision is issued, so the clouds on a sheet always show only the latest change. Otherwise a sheet at revision 6 becomes unreadable, as in the example above.

IFC drawings in the UK and under ISO 19650

Projects run to ISO 19650, which includes much UK public-sector work and a growing share elsewhere, do not use "IFC" as a status. The UK National Annex to BS EN ISO 19650-2 gives every information container a status code for what it may be used for, and a revision code for whether it is preliminary or contractual:

Three traps for anyone moving between the two systems:

• "C" does not mean construction. C01 means the first contractual revision. As Construction Management magazine put it, "some stakeholders falsely interpret the 'C' as 'construction'."
• There is no tender code. Projects use S2, S4 or a stage A code, and some invent "T" codes the standard does not define. Write yours into the project's information standard.
• The codes have changed between editions. S5, for example, has been both a status and "withdrawn" in different versions of the guidance, and S6 and S7 appear in some CDE tools for model authorisation. Check the version your appointment names.

Before you build from an IFC drawing: a checklist

For site teams and subcontractors, five checks that catch most problems:

1. Is the status IFC (or AFC, or an A code)? Not IFB, not "preliminary", not an unmarked print.
2. Is it the current revision? Compare the revision on the sheet with the drawing register or the latest transmittal, not with what is pinned to the cabin wall.
3. Is it sealed and signed where the project requires it?
4. Do the clouds match an instruction? Every clouded change should trace back to an ASI, a change order, a directive or an RFI answer.
5. Do the disciplines agree? Architectural and structural sheets of the same revision date can still conflict. Raise an RFI before building, not after.

For designers issuing the set, the mirror image: issue every sheet in a package with a transmittal, update the register the same day, and never reuse a revision number.

Where BIM fits: models, drawings and IFC files

On BIM projects, IFC drawings are usually cut from the model rather than drawn line by line. When the model changes, the sheets update, and the revision process above still applies. The sheet in this guide was made the same way: its floor plan is a horizontal cut through an IFC4 model, with nothing drawn by hand except the annotation.

That raises a fair question: will the model replace the IFC drawings? On most projects today, no. The drawings and specifications remain the Contract Documents, and the model, often exchanged as an Industry Foundation Classes file, is shared for coordination and information. Some projects do make the model contractual, but the contract has to say so explicitly, together with the model's level of development and which elements can be relied on.

We make AIBIMTool, an AI agent that turns a brief and a site into an editable IFC4 model with plans, sections and elevations. We should be clear about where it sits on the ladder above: it is an early-design tool. Its models are at roughly LOD 200 (we audited them), and no AI-generated drawing becomes an IFC drawing until a licensed professional has developed, coordinated, checked and sealed it.

For the other drawing types in a set, see our guide to architectural drawings, which shows a plan, elevation and section cut from one model.

What people search for about IFC drawings

We wrote this guide around what people actually type into Google, not around what we wanted to say. These are the searches, with monthly volume in the US from Ahrefs (November 2026), and where each one is answered:

What the numbers say:

• Almost everyone wants the meaning, not the procedure. About 2,000 searches a month in the US are variations of "what does IFC mean", against a few hundred about sets, revisions and shop drawings. That is why the definition comes first and the detail follows.
• The term is used more in Canada and Australia than in the UK. "ifc drawings" gets about 300 searches a month in Canada and 250 in Australia, but only 70 in the UK, where ISO 19650 status codes replace it. In Germany it is barely searched (10).
• IFA and IFB are rarely searched on their own. People meet them in the same title block, so they are covered in the status ladder rather than in separate articles.
• "What does IFC stand for" (400 a month) is mostly about construction, but not only. Ahrefs groups it with the construction meaning, yet related searches show some people mean the IFC TV channel (about 80 a month) or university fraternity councils (about 40). The FAQ answers the construction meaning in one sentence for them.

Sources

• CDBB BIM Toolkit, National Annex guidance (PDF): the UK National Annex status codes and revision metadata.
• Autodesk Docs, ISO 19650 status codes.
• Construction Management, Status codes: why the complexity?
• CSI, Shop drawings and submittals: definition, purpose and necessity.
• AIA Contract Documents, Construction contracting basics: submittals.
• EJCDC, What are the construction "Contract Documents"?
• UK BIM Framework, Guidance Part C: the common data environment (PDF).