Decimal Sheet Numbering for Civil Drawings

Sheet Numbering Concept

The core concept of this system is to break the drawing sheets into more manageable chunks by isolating elements into groups.

The Divisions

C0Civil CoversheetsProject Title, General Notes, Drawing Schedule
C1Site/Existing conditions/demolition/landscapingOverall plans
C2Site grading and horizontal controlPlans
C3Site drainage and UtilitiesPlans
C4Site earthworks and excavationPlans
C5Earthwork profiles
C6Road profiles
C7Stormwater profiles
C8Sanitary profiles
C9Water-hydraulic profiles
C10Other profiles
C11Site StructuresDetails
C12Site utilitiesDetails
C13Flow diagrams
C14Site electrical conduit layouts


  1. Small Projects: Plans and details can occupy the same sheet on smaller jobs. In this case use the lowest applicable division for the sheet number. Eg S2.1 = Level 1 slab plan and details
  2. Client Document Numbers: Some times clients what there own document numbers on the drawings. A recommendation for these projects to show thier number in one box titled "document number" and our number in a seperate box nextdoor titled "sheet number".
  3. A decimal separator is used because it commonly means a "division of a whole".

Benefits from a Drafting point of view

  1. Cross referencing errors are reduced due to the relative ease of adding new sheets.
  2. Changes in design are easier to handle due to easier insertion of additional sheets
  3. Drawing sets are more logical as they follow a set menu.

Benefits from a Directors point of view

  1. Cross referencing has always been a major issue when drawing numbers change. This occurs more frequently then it should. Often the problem stems from not allow enough sheets for expansion of the documentation set especially when plans have been sequential numbered. With the decimal sheet numbering system this event is reduced to next to zero. That means less rework of drawings and ultimately a big cost saving for the company.
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