Drafting Deliverable Formats Explained

This matters more than its dull reputation suggests. The most avoidable expense we see in drafting projects is a client who received only flattened PDFs from a previous provider and now has to pay for a redraw before any new work can begin. The original drafting was done. The client just cannot use it.

The formats and what each one is for

DWG. The native AutoCAD format and the working currency of 2D drafting. Layers, blocks and dimensions stay live and editable. Ask for it whenever anyone might need to modify the drawings later, which on the projects we work on is almost always.

DXF. A neutral interchange format. It carries geometry between different CAD applications more reliably than DWG when the receiving software is not Autodesk based. Some fidelity in styles and custom objects can be lost, so it is an exchange format rather than an archive format.

PDF. The universal read and review format. Everyone can open it, it prints predictably, and it is what you send to a client, a reviewer or a contractor. Vector PDFs keep line quality at any zoom. A scanned or rasterized PDF is an image and loses that. It is not editable in any meaningful sense.

RVT. The native Revit format, used when the deliverable is a model rather than a drawing set. It carries the building information, and sheets are views of the model rather than separate drawings.

IFC. The open model exchange standard. Use it when model data has to move between disciplines running different software, or when a client or public authority requires an open format for records.

Practical rules we apply

• Always take the editable original, even if you have no immediate use for it. The cost of storing it is nothing. The cost of not having it is a redraw.
• Take a PDF set as well, and treat it as the issued record of what was delivered on a given date.
• If the drawings will be handed to another consultant, ask which format they want before the work is delivered, not after.
• Confirm whether external references and fonts are bound into the file. An unbound DWG can open with missing content on another machine.
• If you are commissioning a model rather than drawings, be explicit about it. A drawing set exported from a model is not the same deliverable as the model.

Model or drawings

This is the more consequential version of the format question. A 2D drawing set describes the building on sheets. A model holds the building as data, and the sheets come out of it. A model costs more to build and pays back when the project has many changes, multiple disciplines, or a long life ahead of it. Drawings are the efficient answer for a bounded, stable scope.

Neither is universally correct, and we ask what happens to the drawings after delivery before recommending one. The related distinction between drafting and 3D modeling as services is covered in architectural drafting versus 3D modeling.

What to specify when you order

Name the formats, the file organization, the drawing standard or title block to match, and the units. Units in particular are worth stating rather than assuming, because a mismatch is silent and surfaces later.

What to hand over at the start is covered in what to send a drafting partner, and the accuracy expectations attached to the deliverable are covered in drafting accuracy and tolerance standards.