EN ISO 4157-2:1998

Construction drawings - Designation systems - Part 2: Room names and numbers (ISO 4157-2:1998)

Migrated from Progress Sheet (TC Comment) (2000-07-10): Transferred from WI CSI03044 (P. Pieters 97-03)

Zeichnungen für das Bauwesen - Bezeichnungssysteme - Teil 2: Raum-Namen und -Nummern (ISO 4157-2:1998)

Dieser Teil der ISO 4157 legt durch Raum-Nummern Anforderungen an Bezeichnungssysteme für Räume, Bereiche, Zwischenräume und Hohlräume in Gebäuden fest. Damit ist die Erkennung von Räumen bei der täglichen Nutzung der Gebäde beabsichtigt. Die Erkennung von Räumen in einem Bauvorhaben und seinen durchgängigen Phasen Entwurf, Entwicklung, Planung, Errichtung, Wartung,Umbau und Abriß- siehe Teil 3 von ISO 4157.

Dessins de bâtiment - Systèmes de désignation - Partie 2: Noms et numéros de pièces (ISO 4157-2:1998)

La présente partie de l'ISO 4157 spécifie les exigences concernant les systèmes de désignation par des noms et des numéros de pièces des pièces, zones, espaces et vides dans des bâtiments. Elle est destinée à l'identification des pièces dans l'usage quotidien des bâtiments. Pour l'identification des pièces dans un projet, tout au long de ses phases de conception, de programmation, d'étude, de construction, de maintenance, de rénovation et de démolition, voir l'ISO 4157-3.

Gradbeniške risbe - Označevanje sistemov - 2. del: Označevanje prostorov (ISO 4157-2:1998)

General Information

• Status: Published
• Publication Date: 30-Nov-1998
• Withdrawal Date: 29-Jun-1999
• ICS: 01.100.30 - Construction drawings
• Technical Committee: CEN/SS F01 - Technical drawings
• Drafting Committee: CEN/SS F01 - Technical drawings
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 01-Dec-1998
• Completion Date: 01-Dec-1998
• Ref Project: SIST EN ISO 4157-2:2002 - Construction drawings - Designation systems - Part 2: Room names and numbers (ISO 4157-2:1998)

Relations

• Consolidated By: ISO 4157-2:1998 - Construction drawings — Designation systems — Part 2: Room names and numbers
• Effective Date: 12-Feb-2026

Overview

EN ISO 4157-2:1998 - Construction drawings - Designation systems - Part 2: Room names and numbers - is an international standard developed by ISO and adopted by CEN. It specifies the requirements for consistent and logical systems for naming and numbering rooms, areas, spaces, and voids in buildings as represented on construction drawings. This standard is essential for architects, engineers, facility managers, and construction professionals who require a unified method to identify rooms for daily operations, maintenance, and throughout the entire building lifecycle.

By establishing clear and logical principles for allocating room names and numbers, EN ISO 4157-2 supports better communication, document management, and operational efficiency in the building and construction sector.

Key Topics

• Room Number Assignment:
  Room numbers must be allocated in a logical order, typically consecutively, starting with the floor number prefix (e.g., 101, 201, 301 for floors 1, 2, 3). The logical sequence aids navigation and management.

• Scope of Numbering:
  The system applies to all rooms, including enclosed areas, voids, covered spaces, and even certain outdoor areas relevant to the building's function.

• Multi-building Projects:
  Each building in a complex must have an independent room numbering system to avoid confusion.

• Drawing Requirements:
  Room numbers and names must be shown clearly within each space on construction drawings for identification and clarity. For small rooms, numbers alone on the drawing can suffice, with names provided elsewhere.

• Room Numbering Rules:

  • Use consistent digit formats (two, four, or five digits) per building, according to size.
  • Special designations for spaces like basements or ground floors (e.g., B01, G02).
  • Certain numbers (e.g., “Room 0”) are reserved for building exteriors.

• Handling Changes and Special Cases:

  • Guidelines for adding new rooms, combining spaces, or numbering areas like staircases and shafts consistently across floors.
  • Logical gaps in numbering are allowed when rooms are merged or omitted as needed for clarity.

Applications

Implementing EN ISO 4157-2:1998 in architectural and engineering practices offers several advantages:

• Standardized Room Identification:
  Consistent room names and numbers simplify design, documentation, construction, and facility management processes.

• Enhanced Communication:
  Clear room identifiers minimize misunderstandings among project stakeholders, including architects, contractors, engineers, and facility operators.

• Lifecycle Asset Management:
  The standard supports facility management, aiding in tracking spaces for planning, maintenance, renovation, and demolition.

• Efficient Navigation:
  Logical room numbering allows users and visitors to orient themselves easily, improving usability and safety.

• Interoperability:
  Aligns with building information modeling (BIM) and other digital construction documentation systems, ensuring data consistency across tools and teams.

Related Standards

• EN ISO 4157-1:1998
  Construction drawings - Designation systems - Part 1: Buildings and parts of buildings
  Defines designation systems for identifying whole buildings and their constituent parts.

• EN ISO 4157-3:1998
  Construction drawings - Designation systems - Part 3: Room identifiers
  Extends the principles to unique room identifiers appropriate for use throughout a building's lifecycle.

• ISO/TC 10/SC 8 Standards
  Other standards in the ISO/TC 10 series related to technical drawings and construction documentation.

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Keywords: EN ISO 4157-2:1998, construction drawings, room numbering system, room names, building designation, architectural standards, room identification, CEN, ISO, facility management, construction documentation.

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2002
*UDGEHQLãNHULVEH2]QDþHYDQMHVLVWHPRYGHO2]QDþHYDQMHSURVWRURY,62

Construction drawings - Designation systems - Part 2: Room names and numbers (ISO
4157-2:1998)
Zeichnungen für das Bauwesen - Bezeichnungssysteme - Teil 2: Raum-Namen und -
Nummern (ISO 4157-2:1998)
Dessins de bâtiment - Systemes de désignation - Partie 2: Noms et numéros de pieces
(ISO 4157-2:1998)
Ta slovenski standard je istoveten z: EN ISO 4157-2:1998
ICS:
01.100.30 *UDGEHQLQDþUWL Construction drawings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 4157-2
Second edition
1998-12-01
Construction drawings — Designation
systems —
Part 2:
Room names and numbers
Dessins de bâtiment — Systèmes de désignation —
Partie 2: Noms et numéros de pièces
A
Reference number
ISO 4157-2:1998(E)
ISO 4157-2:1998(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 4157-2 was prepared by Technical Committee ISO/TC 10, Technical drawings, product
definition and related documentation, Subcommittee SC 8, Construction documentation.
This second edition cancels and replaces the first edition (ISO 4157-2:1982), which has been technically revised.
ISO 4157 consists of the following parts, under the general title Construction drawings — Designation systems:
 Part 1: Buildings and parts of buildings
 Part 2: Room names and numbers
 Part 3: Room identifiers
©  ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
Printed in Switzerland
ii
INTERNATIONAL STANDARD  © ISO ISO 4157-2:1998(E)
Construction drawings — Designation systems —
Part 2:
Room names and numbers
1 Scope
This part of ISO 4157 specifies requirements for designation systems for rooms, areas, spaces, and voids in
buildings by room names and numbers. It is intended for identification of rooms in the daily use of the buildings.
For identification of rooms in a project throughout its life-cycle, i.e. conception, programming, planning, erection,
maintenance, remodelling and demolition phases, see ISO 4157-3.
2 Normative reference
The following standard contains provisions, which through reference in this text, constitute provisions of this part of
ISO 4157. At the time of publication, the edition indicated was valid. All standards are subject to revision, and
parties to agreements based on this part of ISO 4157 are encouraged to investigate the possibility of applying the
most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid
International Standards.
ISO 4157-1:1998, Construction drawings — Designation systems — Part 1: Buildings and parts of buildings.
3 Definitions
For the purposes of this part of ISO 4157, the definitions given in ISO 4157-1 apply.
4 Room number principle
4.1 Logical order
Room numbers shall be assigned to all rooms on each floor in a logical order, preferably consecutive, starting with
number n01 (where n indicates floor number) within the limits of all the parts of the building. Such limits need not be
physical walls, so that outdoor or covered areas which are appropriate to include in the numbering system may be
assigned room numbers, e.g. an enclosed garden, a pool area, a carport, a covered loggia and in-between spaces.
4.2 Separate buildings
If several buildings are included in one building project, room numbers shall be allocated independently to each
building in accordance with 4.1. Separate buildings may be adjacent to each other, and may be interconnected by
doors or openings.
© ISO
ISO 4157-2:1998(E)
4.3 Indication on drawings
...