Decimal Sheet Numbering for Structural Drawings

Compiled by Allan. January 2005

Sheet Numbering Concept

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

The Divisions

Division  Description  Remarks  
S1Structural CoversheetsGeneral Notes, Drawing Schedule
S2PlansAll types of plans: slab, roof framing, reinforcing, stressing plans etc. also include member schedules on plan
S3Building ElevationsOverall elevations, Concrete/Masonry Elevations, Precast Elevations
S4Building SectionsOverall building sections showing several elements
S5Foundation DetailsAll details to do with foundations
S6Retaining Wall DetailsRetaining walls of any type of material
S7Slab Details"Slab on grade" details, floor slab details / sections
S8Concrete Column SchedulesSchedules, Elevations, Detailed Sections of concrete columns
S9Concrete Beam SchedulesSchedules, Elevations, Detailed Sections of concrete beams
S10Lifts, Stairs, Vertical CirculationElevations, Schedules , Details of any element rising through floor levels
S11Steel Details
S12Masonry Details
S13Precast Details
S14Timber Details
S15External Works

Double Decimals

Where multiple plans of the same level are required a double decimal system may be used.
S2.1 Level 1 Slab Plan
S2.1.1 Level 1 Reinforcement Layout
S2.1.2 Level 1 Prestress Layout
S2.2      Level 2 Slab Plan
S2.2.1 Level 2 Reinforcement Layout

Example Set:

S1.1General Notes
S2.1Level 1 floor plan
S2.1.1Level 1 bottom reo plan
S2.2    Level 2 floor plan
S2.3      Roof plan
S5.1Foundation details
S7.1Slab Details
S11.1Steel Details


  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 allowing 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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