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Door Numbering

• Introduction
• Door numbering
• Numbering systems and scheduling
• Client requirements
• Late changes

Introduction

• This page describes a system for the numbering of doors on projects of varying size and complexity. There is no equivalent to BS EN ISO 4157-2 for doors although the recommendations on this page follow similar principles, combined with the practical experience of several architectural practices.
• This page should be read in conjunction with the page on Room Numbering.

Door numbering

Option 1

• This is likely to be the only sensible system for complex buildings with inter-connecting rooms such as hospitals, laboratories, and some educational buildings.
• Use the same principle as for rooms. There are three logical systems - select whichever is the most appropriate for your project and, most particularly, use the same system (and the same number of digits) for both rooms and doors:
• Doors are numbered starting from the main entrance to the building, or the main access to each floor, and progressing clockwise.
• In buildings such as hotels, where such a numbering system is conventional, doors may be numbered in an ascending order on both sides of a corridor in a zig-zag manner.
• If there is no logical starting point, doors should be numbered starting from the top-left-hand corner of the complete floor plate drawing (Location or General Arrangement drawing as appropriate), and progressing clockwise.
• You may wish to prefix the number with a letter to denote the component type. For example:
  Ground Floor Internal Doors: D301 to D399.
  Ground Floor External Doors: DX301 to DX399.
  Ground Floor Access Doors: A301 to A399.
  First Floor Internal Doors: D401 to D499.
• Read about Numbering systems and scheduling.

Option 2

• Door Numbers may be related to Room Numbers. For example:
  Doors related to Room 101 would be numbered D101/1, D101/2, etc., prefixed with a letter to denote the component type.
• If this system is adopted, it is recommended that all doors are suffixed, even when there is only one door related to a room. For example:
  The only door related to Room 101 would be numbered D101/1, not D101.
• Read about Numbering systems and scheduling.

Option 3

• This system is generally applicable only to large, highly repetitive, residential buildings such as flats, university halls of residence, or nurses accommodation.
• Doors are not individually numbered and a Door Type Code is placed directly on the General Arrangment drawings instead of the Door Number. This system will only work satisfactorily if the following criteria can be met:
• There are a limited number of variations of door type - say 10/12 in general, 15 at the most. It is not necessary to consider 'handed' variations as being another type as this information can be shown adequately on the GA drawings.
• Each door type always occurs in one, or more, logical locations. For example, considering a university hall of residence:
  Flat entrance doors are always Type A1 or A2,
  Bathroom doors are always Type B2,
  Kitchen doors are always Type C2, etc.
• Each door type has (preferably) only one fire rating. For example:
  Type A doors are always FD30S,
  Type B doors are always un-rated, etc.
• Each door type has (preferably) only one associated ironmongery set. One ironmongery set may, however, be associated with more than one door type. For example:
  Type A doors always have set P21:211,
  Type B doors always have set P21:212,
  Type C doors always have set P21:211, etc.
• Using this system, a Door Schedule is not required.

Component prefixes

• Recommended component prefixes are:
  A : Access doors or panels.
  D : Doors (or internal doors).
  DX : External Doors (if differentiated).
  S : Glazed screen.

Numbering systems and scheduling

• The equivalent section on the Room Numbering page applies equally to Door Numbering.

Client requirements

• The equivalent section on the Room Numbering page applies equally to Door Numbering.

Late changes

• However much planning is carried out, late changes to door numbers are inevitable:
• Option 1 (as above): When a door is added, it should take the next available unused door number on that floor, even though this will not place the door in a logical order. For example:
  Assume a floor with 35 doors, numbered D301 to D335. The 'new' door would be numbered D336.
• Option 2 (as above): When a door is added, it should take the next available unused door number for that room. For example:
  Room 301 has three doors numbered D301/1, D301/2, and D301/3. The 'new' door would be numbered D301/4.
• Option 3 (as above): The appropriate Door Type Code should be added to the General Arrangment drawings.

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