EN ISO 4157-3:1998

• Abstract:

  This part of ISO 4157 establishes requirements for designation systems for rooms, areas, spaces, and voids in; buildings by room identifiers. It introduces a new designation concept intended for identification of rooms in a project; throughout its life cycle, i.e. the conception, programming, planning, erection, maintenance, remodelling and; demolition phases.

• 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 4157-3:2002 - Construction drawings - Designation systems - Part 3: Room identifiers (ISO 4157-3:1998)

• Consolidated By: ISO 4157-3:1998 - Construction drawings — Designation systems — Part 3: Room identifiers
• Effective Date: 12-Feb-2026

Overview

EN ISO 4157-3:1998 - Construction drawings: Designation systems - Part 3: Room identifiers (ISO 4157-3:1998) defines a standardized system for uniquely identifying rooms, areas, spaces and voids in buildings across the entire building lifecycle. Adopted by CEN, this part of ISO 4157 provides rules to create persistent, computerized-friendly room identifiers that support planning, construction, maintenance, refurbishment and demolition.

Key topics and requirements

• Unique, persistent identifiers: Room identifiers are intended to remain stable throughout a building’s life and must not be revised once assigned.
• Composition and format: An identifier consists of a storey number combined with a typically three‑digit sequence, preceded by the prefix I# (ISO Room Identifier). Example sequencing per storey starts at I#n001 and ascends without gaps.
• Positive integers: Room identifiers are expressed as positive integers and include one more digit than room numbers to clearly distinguish them from room numbering systems.
• Geometry-based definition: Rooms are defined by their physical boundaries or by imaginary planes corresponding to building parts (storey levels, beams, partitions), enabling precise spatial definition.
• Correspondence rules:
  • Every room number must have a corresponding room identifier.
  • Not all room identifiers need corresponding room numbers or room names.
• Documentation requirements: Owners should maintain a complete list of room identifiers with cross-references to:
  • Geometry (x, y, z coordinates - origin, minimum and maximum extensions)
  • Dates of erection and demolition
  • Room names and room numbers (if any)
• Computer interoperability: Identifiers are designed for interface with computerized information systems (BIM/CAFM).

Applications and users

Practical uses of EN ISO 4157-3:1998 include:

• BIM and CAD authors: consistent tagging of spaces across models and construction drawings.
• Facility and asset managers: linking equipment, maintenance records and space schedules to a stable identifier.
• Architects and building designers: harmonizing room data from concept through handover.
• Contractors and facility operators: tracking changes during construction, remodels and demolition.
• Software vendors: implementing standard identifiers in CAFM, IWMS and BIM tools for reliable data exchange.
• Emergency planners and surveyors: precise location referencing using room coordinates.

Related standards

• ISO 4157-1:1998 - Buildings and parts of buildings (storey numbering)
• ISO 4157-2:1998 - Room names and numbers

Using EN ISO 4157-3:1998 helps organizations achieve consistent room identification, improved data interoperability, and reliable lifecycle information management for buildings.

SLOVENSKI STANDARD
01-februar-2002
*UDGEHQLãNHULVEH6LVWHPLR]QDþHYDQMDGHO,GHQWLILNDWRUMLSURVWRUD,62

Construction drawings - Designation systems - Part 3: Room identifiers (ISO 4157-
3:1998)
Zeichnungen für das Bauwesen - Bezeichnungssysteme - Teil 3: Raum-
Kennzeichnungen (ISO 4157-3:1998)
Dessins de bâtiment - Systemes de désignation - Partie 3: Identificateurs de pieces (ISO
4157-3:1998)
Ta slovenski standard je istoveten z: EN ISO 4157-3:1998
ICS:
01.100.30 *UDGEHQLQDþUWL Construction drawings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 4157-3
First edition
1998-12-01
Construction drawings — Designation
systems —
Part 3:
Room identifiers
Dessins de bâtiment — Systèmes de désignation —
Partie 3: Identificateurs de pièces
A
Reference number
ISO 4157-3:1998(E)
ISO 4157-3:1998(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 4751-3 was prepared by Technical Committee ISO/TC 10, Technical drawings, product
definition and related documentation, Subcommittee SC 8, Construction documentation.
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 4157-3:1998(E)
Construction drawings — Designation systems —
Part 3:
Room identifiers
1 Scope
This part of ISO 4157 establishes requirements for designation systems for rooms, areas, spaces, and voids in
buildings by room identifiers. It introduces a new designation concept intended for identification of rooms in a project
throughout its life cycle, i.e. the conception, programming, planning, erection, maintenance, remodelling and
demolition phases.
2 Normative references
The following standards contain provisions, which through reference in this text, constitute provisions of this part of
ISO 4157. At the time of publication, the editions indicated were 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 editions of the standards indicated below. Members of IEC and ISO maintain registers of currently val
...