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Numbered CAD Layering System

From Draftsperson.net

Revision as of 02:33, 24 March 2006; view current revision
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April 2005 Written with the use of AutoCAD in mind, however principles apply to other CAD packages.


Core concepts

All layer names are prefix with a predefined set of numbers is the core of the concept behind this system. The first digit represents the discipline and the following digits refer to the object type (doors, columns etc.).


Multiple drafters can work together on the same projects because the layer list is ordered and structured.

In theory elements from different disciplines can be drawn in a single file - In practice XREF-ing to individual files may be easier to manage.

The preset numbering of the layers allows for CAD programs to filter and manipulate the drawing easier. A program can search for those set parameters.


The layer naming can be just the numbers or with the following extensions:

  • X = eXisting: the objects drawn are existing conditions
  • D = Demolition: the objects drawn have to be demolished
  • N = Non-structural: both Architectural and Structural may require the use of this, for example, defining the structural and non-structural walls.
  • P = Proposed: Generally drawings are for proposed works anyway, however there may occur cases where it may be necessary to make the distinction.
  • -description = the dash and description can be used on all layers; example 105-room names, 105X-room names.

Combinded Disciplines - sample list

Printable version



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