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Red Line Markup & Changes To Drawings

Engineering and architectural drawings often require changes, and drawings that show these changes are known as red line markup drawings (or redline markups).

Why do drawings need to be changed? Sometimes, perhaps during an on-site surveys or simply when proofing a drawing, the architect, engineer or builder notices errors in the current version of a drawing. He or she usually annotates the paper drawing using a red pen. A red-line drawing shows corrections or changes to a previous version. The term red line literally comes from the (typically) red pen used to make hand-written changes to a paper drawing. Today, architects and engineers use digital pens to make changes to digital drawings, but the color used is still usually red.

The project’s document manager will typically take responsibility for reviewing the annotations (i.e. the “red line markups”) and incorporating the required changes in the CAD drawings.

Design Presentation can assist you with making redline changes. Submit your redline markup drawings by scanning them (or taking a picture of them) and sending them along with the CAD file that you want us to change. During the drafting process, we will incorporate the markups (e.g. PDF, TIF or JPG format) into the CAD (e.g. DWG, DGN) file.

Need help?

Provide us with your existing AutoCAD DWG, Microstation DGN, or Revit RVT files and along with the redline markup sheets (which could be in any format, such as PDF, TIF, JPG, etc.). Our CAD operators will update the existing CAD files to reflect your markups.

When preparing your redline markup drawings it is important to write neatly and clearly so that we can interpret the changes. Redline markups can also be prepared using Adobe Acrobat and the various comments tools available electronically.

Use standard colors so that we understand what you want us to do:

  • RED = Changes to be incorporated into CAD fies
  • BLUE = Comments to our CAD operators only

We can help you even if you don’t have a CAD file, but just a scan of the marked up drawing:

  • Markups without CAD file: We will redraw from scratch with redline markup drawings incorporated
  • Markups with CAD file: We will update your existing CAD files (DWG, DGN, Revit) with the required changes

Our skilled team can incorporate red-line markup changes to any type of standard drawing format (e.g. DWG or DGN).

Contact us today for a free trial.